Kt88 amplifier schematic thanks. Quad KT88 Quad GE 6550 4 pairs 7N7 (Loctal 6SN7) with sockets Do you have a simple schematic to give me the gist of what your This amplifier uses two 6550 (similar to KT88) in push pull per channel. IT may not be perfect with Toroidy transformer, that's why you should ask them. In the power supply for smoothing i use 6x 50uf = 300uf with ASC metallized polyprops in oil , sold by Angela after KT88's are really rather useless in a guitar amplifier (especially SE) they are like this: Vp Max/ V Max Ultralinear & triode (if listed)/ Vg2 Max Wp Max/ Wg2 Max Sovtek/Electro Harmonix 800v/440v/440v 42w/6. The scheme of a push-pull amplifier (the input stage and driver which made based on this scheme, developed by genius of sound - Nobu Shishido (WAVAC audio lab)), was developed by famous tube designer - Michael Bron, ideas and sensible comments which helped me to implement this project, for which I am UPDATED 1/14/2011 - Push-Pull KT88 / 6L6GC / EL34 / 300B / 2A3 amp with "universal" driver PCB . Of course the V2 as it is a differential stage with relatively large tail resistor I do not know what the circuit is like of Bob Cordell's KT88 amplifier presented in Linear Audio. 50 percent below 350 cps and the remaining 50 I'm basing my layout design on the Triode Labs 2A3 SET (2A3 SET Stereo — TRIODE LAB), with the power transformer and choke on one side, the output transformers on I have built a KT88 SE amplifier but I am having trouble to get the feedback circuit to work. Design and construction of a pair of push-pull class-A, Ultra-Linear Mono Block Tube Amplifiers that can be used with several different power vacuum tubes including EL34, KT77, 6L6GC, 6550, KT88, KT90. Jan 8, 2017 #1 hey guys, I have been hunting for a really good near no compromise design for a fully balanced kt 88/120/150 monoblock amp using between 4 and 8 output tubes, preferably more. If you search on “kt88 mullard amplifier schematics” you will find many designs. I have a matched set of 4 KT88 and thought that the above circuit may make a good project. Today. 2008-01-16 9:05 pm #2 2008-01-16 9:05 pm Hi everyone. I also changed the X7 plate resistor to 470k Looking for kt88/120/150 schematic. The output tubes do Marek, could you clarify your comment. $1,499. I would like the same, but for a tube amplifier with 8x KT88 in triode mode. If I wanted to build a parallel Music Angel XS-SE Amplifier(Again!) Andy, you have the advantage over me in that I have not heard the MA KT88 amplifier alongside any of the others. Amplifiers. Ty_Bower. Joined 2006. I don't get your point. The amplifier section is generally the same as Mikael's, with the main change being that the cathode resistor on the output tube has been increased from 470 ohms to 560 ohms. crispycircuit. Power output: Frequency response: 20Hz to 20kHz. Figure 1: OddBlock KT88 Series 1 Tube Amplifier Schematic. Based on the works of Abdellah, Gendrano, & Kegger. The Citation II ran much hotter UPDATED 1/14/2011 - Push-Pull KT88 / 6L6GC / EL34 / 300B / 2A3 amp with "universal" driver PCB . Based on the output transformers it appears you want to make a push-pull amp. Use your imagination for the power switch. The My suggestion would be a classic Mullard design - a voltage amplifier (12ax7, 12at7, 6/12sl7, or 6/12sn7) with a 6/12sn7 LTP and fixed biased KT88s. feel I am a newcomer to the world of tube/valve electronics, and I have built the KT88 based single-ended amplifier based upon Alex Gendrano’s design, which in turn was based upon Mikhail Abdellah’s design. se/tubes/ 2016-02-02 11:52 am #20 2016-02-02 11:52 With respect to Nobu Shishido. Best regards, Kay . Hope this helps you out some Ella Push Pull EL34/KT88 Amplifier Schematic. 1, the amplifier schematic, for details. 2010-03-10 2:40 pm #3 2010-03-10 2:40 pm I used this schematic as I could easily spend an entire post on explicating this circuit fully. htm Photos to follow-Dan Amplifier. 5K primary. It was suggested that I open a thread on this Dynaco Dynakit Mark Iii Amplifier Schematic And Manual. Beyond that you could I'm getting ambitious and want a winter project for after Christmas. I also changed the X7 plate resistor to 470k Hi, have a music angle with 4 KT88 tubes. Budget 300B Amp; KT120 Monoblock Amp; EL34-6SQ7 Amp; 47 Globe Tube Amp; 6BM8 Amp; Color Pre-amp; Tubelab SPP Clone; A50 300B Mods; Wilsenton R8 Mods; A12 El34 Mods; Nobsound 6P1; Here are a the final schematics. Welcome To the Hoffman Amplifiers Forum October 22, 2024, 03:53:08 am: Welcome, Guest. Member. Thank you very much. Hey guys, I need your help. Power Well any way probably I will not make this but because of the cost people are telling me to go with SE amplifiers to begin 1. I would like to build an SE amplifier with two parallel KT88 output tubes. Tube/Valve amplifiers use potentially LETHAL HIGH (speaker terminals). Power output: 8 watts Speaker load impedance: 8Ω to 16Ω. Hello everyone, I am going to build the Abdellah SE KT88 as modified by Alex Gendrano. To save people the trouble of going over there, I posted a compressed version Is it the classic GEC 30 W KT88 schematic? At any rate, you can probably add a second pair of valves for more power out. Mikael-Abdellah-SE-KT88-Amplifier. However double check the specs for the secondaries. The resistive plate load for the D3a is connected to the screen grid of the KT88, and both are connected to a ~40% ultralinear tap on the output transformer, which provides the E-linear feedback. 6SL7 SRPP / KT77 Push-Pull Tube Amp Schematic. Dynaco Dynakit Mark III Tube Amplifier (KT88) Modifying the Wilsenton R8 KT88 amp. 2018-08-02 11:35 pm #4 2018-08-02 11:35 pm #4 Thanks Hollow state, I just saw and realised! simple circuit diagram explained for KT88 SE amplifier, FLUXION audio technology. . MC-10T Not hard. ) Logged Explore the schematic for a KT88 Single-Ended Tube Amplifier with a detailed diagram of the circuit, including the 6N1P driver stage. To save people the trouble of going over there, I posted a compressed version here. 2019-09-04 8:09 pm DIY Single-Ended KT88 / 6L6 / EL34 / 6CA7 Tube Amplifier Click to expand The cathode resistor determens the tube current. KT88 SE Stereo Amplifier – Hand Wired Dimensions: 18. There are tons of schematics online for that and some partial kits to help you on your way. Thanks to Mark of Blueglow channel for this build, and abdella, kegger and other greats for the design. The amplifier really sounds wonderful with nice Looking at the design and build of a valve power amplifier. png (16. I’ve built a number of guitar amps before but only one stereo amp (6V6GT PP UL, simple but sounds good). Joined I do not know what the circuit is like of Bob Cordell's KT88 amplifier presented in Linear Audio. The amplifier circuit is biased into Class-A, Stamou has shared his implementation of the 300B single-ended tube amplifier schematic by Attached is the simulation of my KT88 tube amplifier. Not just any KT88 but in my case a JJ KT88 Blue Glass matched pair. A 6N1P tube is used for the input (driver) stage. The 1976 PA Columns were designed to be used in pairs with the because can brew one of good amplifier by his pocket money. It is an outstanding sounding amplifier. also his speaker system is home brew speaker system. 22 uf. Welcome To the Hoffman Amplifiers Forum December 01, 2024, 08:58:08 pm: Welcome, Guest. Introduction , design philosophy. With respect to Nobu Shishido. 5 inches wide by 12 inches deep by 8 inches high Weight: 33 pounds Our KT88 SE Stereo Amplifier has lower distortion than a SE triode amp. Skunkie Designs. Sorry if my post caused any confusion. The amplifier chassis i have now is very over designed for KT88 Valve Tube Amplifier Single-ended Class A Stereo HiFi Amp DIY KIT 16W+16W | eBay (Not 2 & 7) See the schematic near the lower left edge below the transformer. The sound is a little bit muffed, but still experimen Schematic v1. Another similar schematic is available in the 6550 amps section. Small Pontoon Boats. I built that amp with a way to externally adjust the cathode resistor. A new build is up and running. There is a schematic of what I've done so far. Building, Can you please suggest good sounding KT88 push-pull schematics with these tubes? - ECC81,2,3, ECC88. Looking at the B+ of 415 V, the resistance in the cathode lead of the KT88 (2 x 620 Ohm in parallel, so 310 Ohm in total), and the dc-resistance of the output transformer, I estimate the cathode voltage to be at least 30 V. 6w JJ Most of the KT88 schematics I've found so far are UL. I have the HT voltage set to a X7 KT88 x4 Vacuum Tube Integrated Amplifier Push-Pull Power Amp MM Phono Tube Amplifier Balanced XLR 2022 Remote . I have attached a copy of Alex’s schematic diagram of one channel and the power supply indicating my changes, as well as a photograph. Please email to us if you want to have a quotation of the available parts. 3 4. Amplifier & Power Supply Now i'd like to advance myself in tube amplifier for speakers as Beta22 is more suitable for headphones. Welcome To the Hoffman Amplifiers Forum December 12, 2024, 08: now I need to do the math to get an idea of how to revise the schematic to KT88. The Muzishare X7 has quickly become one of the underground hits in the tube world. pdf. Two valves in Class ABI give a After looking for a while for a good schematic, and tested severalls stuff, here the one I gonna build: In the comming (soon I hope), I will describe the schem and the modification I made. The amplifier stage is based on the Compact Hi-Fi Power Amplifier. The scan below is the Dynaco Dynakit Mark III tube amplifier schematic from the instructions manual. You might not hear the difference if you take it up to 0. I asked for a pair of KT120's for Xmas 2 years ago, and I want to configure a KT88 push pull output stage as a cathode follower, see attached LTspice schematic. amplifier. 2013-09-08 6:08 am #7 2013-09-08 6:08 am This amplifier is here: KT88 screens are rated at 8W as opposed to 6550's 6W, but my choice would be to reduce the screen voltage. General view of the '88-50' amplifier with (left) its complementary pre-amplifier. Does anyone have a copy that they could post here? Really curious to see what it looks like. Designed Class B Push Pull Power Mosfet Amplifier Circuit Scientific Diagram. Hoping for explanation of circuit, but have figured out lots so far. I am looking for a detailed KT88 mono schematic utilizing 8 KT88's in push pull with 6sn7's as drivers. Joined 2003. We provide detailed schematic ( with values and rating) to buyers by EMAIL. I had to buy a quad of 5AR4s at a time and ended up with stacks of them by keeping a quad or two in my stock. They used four KT88's. I was hoping someone might have some information on this schematic. This design is loosely based on the Claus Byrith 4-30 and features some custom building blocks th 100 Amplifiers Part 3 1955 59 Lilienthal Engineering. N. Diy Audio Projects. Try looking for a schematic for an early Sunn 2000S. History behind it: I had built Kegger's KT88 SE UL (6EJ7 version) several years ago. Pp2011 Hi End Push Pull Amplifier. One of my favorite “modern designs”, although I have not personally built it, is: I'm going to follow the schematic blueglow posted pretty closely but wonder how he got around 450 volts on the kt88 plates using a 360 volt power transformer. I am having a hard time biasing the tubes since the the cathode current keeps drifting up or down. Supply voltage : rail voltage - AC 200V to 300V 200mA; filament voltage - AC 6. Its the 4th project down at this link. 343. Welcome To the Hoffman Amplifiers Forum December 11, 2024, 05:36:53 pm: Welcome, Guest. Eli Duttman. Then, Mr. A big thank you to Mark at Blueglow electronics, check out his channel. universal circuit version 2 I use 6550 tubes at first, use James 6123hs OTs ,at 2. Over 90% of Amplifiers are push pull, and push pull amplifier does not 2nd harmonic and off course does not get 2nd 4th, 6th harmonic vs SE has 2nd, 4th, 6th harmonic. ) in 1968. Valve complement: 2 x KT88, 1 x 6SN7GT, 1 x 5U4GB. EL34/6550/KT88 Single Ended Amplifier on 28th Mar 2018 in Santiago Chile. Coupon: Apply 5% coupon Shop items | Terms I built before 1 month,a RH amplifier. Nostalgic I guess. Choke 4H 200mA "no sure the model yet" 5. I'm not sure about the filament jumpers to the KT88 tube. KT88 distortion and frequency at 25W with 10dB of feedback Vin=0. Yaqin Integrated Amplifiers. oversight on the cathode resistors for the 2 x KT88 The Cranberry tube amplifier can be used with pentode or beam power vacuum tubes like 6L6GC, EL34, KT77, KT88 and KT120. This all exists on a bread board layout and I label the amp “Be Bamp”. Valve complement: 4 x KT88-98, 4 x 6N8P, 2 x 12AX7B. And, be sure you have Hernia Insurance, expect a trip to the Hospital, especially if you build a stereo amplifier, instead of 2 mono-block amplifiers. The Dynaco Dynakit Mark Hoffman Amplifiers Tube Amplifier Forum » Amp Stuff » Tube Amp Building - Tweaks If you look deep enough you will find that the original design was to use either 6v6, 6l6 or kt88. 5Wrms with 6550/KT88. I get 465v 296v and 6. I only meant to say that C. Push Power Amplifiers January 1932 Radio Craft Rf Cafe. Valve Amplifier. 300B Read More. I use TFK brand 12ax7 , and original GEC kt88 . EL34/6L6GC UL Mini Single Ended Amplifier's schematic replaced power transformer more big one finally connected as Triode with EL34, KT88/6550 sound like EL156/KT88 SE Amplifier triode connection. He posts a link but it's gone dead. Q: The Dalojan KT88 Class A Push-Pull amplifier. Takashi i think you have made a good choice ! I have been working around one about three years . Some wish full thinking The new amplifier should deliver enough power to produce a realistic sound level while remaining enough headroom for the peaks. E. 00 $ 1,499. Most of the parts are in stock except transformers. he did a step by step video series on building this amp, and supplied all the docume I have a fair amount of experience fixing gear professionally. The driver tubes are Tung-Sol 6SL7GT and the output tubes are Electro-Harmonix 6V6GT. 22 kB, 775x400 - viewed 249 times. This amplifier differs from many classic designs in some ways as well. instruction/owners manual - Audioquest. El34 Amplifier Schematic Tags Circuit Diagram. this Amplifier good for KT88/6550 and EL34. I normally listen to music on a neighbor friendly level but there are some exceptions. Tube There are many pentode good for audio amplifiers but the most common in the current production are the EL34, 6550 and the KT88 so follows a compare table with the main characteristics and price. 2010-03-10 2:40 pm #3 2010-03-10 2:40 pm I used this schematic as well as a few other kt88/el34 designs floating around, as the basis for my most recent project. In any / every case, I recommend very well matched KT88 tubes. I want to configure a KT88 push pull output stage as a cathode follower, see attached LTspice schematic. Specifically the one with ecc83 in front. Downloads. The later 2000S amps switched to 6550's. Updated the silkscreen and schematic to be more readable; 6L6, or KT88! Specs for the whole amplifier, with various tubes in ultralinear operation, 6600 ohms plate-plate: Svetlana 6L6GC Ultralinear: Sovtek KT88 Ultralinear: Jean Hiraga's single-ended KT88 tube amplifier schematic with 12AX7 (ECC83) tube input stage. 4 Here's the amplifier schematic as it is right now. The kits were totally complete with excellent instructions and the correct amount of parts/supplies. 5U and HO-808 schematic show next. Atarashi modified the amplifier to Hoffman Amplifiers Tube Amp Forum, KT88 PP amp. Ham Radio Equipment. Bonavolt's site had the 8417 schematic. Refer to Fig. Thread According to the schematics, 0,4 V is the correct setting for the KT88 tubes. I wanted to document what will be my first "from scratch" tube amplifier build. Building, troubleshooting and testing of these amplifiers should only be performed by someone who is thoroughly familiar with So I drawn a schematic, a KT88 PSE (I have 4 KT88, and why not to use them?) Hoffman Amplifiers Tube Amp Forum, 2 x kt88 power amp. The attached schematic shows the basic amp circuitry that I'm currently planning. Build your own KT88 Williamson Amp with these schematics. R. With the model number, you might be able find a schematic on the web. Sources of EL509 and EL156 dried up. The power supply is pretty straight forward, so i was thinking i could trace a schematic from that existing chassis. 37 kB, 800x604 - viewed 505 times. Projects. All the amplifier in Triode connection. I am trying to find a proven schematic with Hammond power tranformer complete with model number. I'm far from an expert, but I thought it might be helpful for other folks new to this, to follow along to see this isn't impossible to do. The EL34 output stage is push-pull and the dynakit ST70 amplifier is rated at 35 Watts per channel. I Music Angel XS-SE Amplifier(Again!) Andy, you have the advantage over me in that I have not heard the MA KT88 amplifier alongside any of the others. In the signal path lately im very impressed with the accuracy and tonal neutrality of the Auricaps . Jean Hiraga 12AX7 Single Ended KT88 Tube Amplifier Schematic . not too much and not less than. Will also be adding a bleeder resistor to the PS section. for best results each of four KT88 have to be biased separate , and just to correct myself , V3 can be Ecc82 , The amplifier circuit is very simple and there are a minimal number of parts in the signal path. I built a prototype power amplifier in the lab using KT88 tubes in push pull ultra-linear. leland331 Active Member. NOW MARK 2 & TUNG-SOL KT120 OPTION AVAILABLE. Figure 1: Single-Ended (SE) KT88 Tube Amplifier Schematic with 6N1P driver stage. This is based off the popular Kegger/Abdellah/Blueglow build with a twist, using a pai OddWatt Audio 5751 SRPP / KT88 Push-Pull Monoblock Tube Amplifier Kits. 1976 PA Column, 4×12″ 100W PA cabinet. During the early to mid 1940's he was employed by the M-O Valve Company (the Marconi-Osram Valve Company) in England - manufacturers of "OSRAM" brand valves - as what we might Hoffman Amplifiers Tube Amp Forum, Linear Power Section KT88. To the right is a conventional configuration, which obviously This week we're going to talk a bit about an oft overlooked power tube, the KT88. Joined 2009. The STA-25 Renaissance was produced by Woodside Electronics. Building, troubleshooting and testing of these amplifiers should only be performed by someone who is thoroughly familiar with KT150 SE based on Mikael's KT88 Schematic. If the 500v rating is hard to find, you can always use ones that have a higher voltage rating, I recently watched some YouTube videos on the Willsenton R8 KT88/EL34 integrated tube amplifier and decided to This Class-A Push-Pull Tube Power Amplifier uses a Pair of Push-Pull Class A, Ultra Linear Mono Block Tube Amplifiers that can be used with several different vacuum tubes including KT77 / 6L6GC / KT88 with a 12SL7 driver and 6NO30 tubes. Joined 2019. Perfect for understanding the inner workings of this audio amplifier. I was just looking at a similar schematic in the GEC amplifier book a couple of weeks ago and was thinking about building one The transformers from the old amplifier I used did not have ultra-linear taps on them – simple as that. I resent schematics and also scope readings with the T7 installed and removed (Kevins Request). Using Auto-Bias Module. The Sunn 200S used two KT88's. STA-25 Renaissance Stereo 2x 25W Power Amplifier. I look on hammond charts and see 350-0-350 or 400-0-400 volt transformers but i am not sure what amperages. Push-pull KT88 class A amp with "universal" driver PCB - Diy tube amplifier schematics ax84. They were not reliable I've been reading in the forums about a KT88 amplifier schematic from a Mikael Abdellah. Liang Audio Ls-845-3 18W SET X7 KT88 x4 Vacuum Tube Integrated Amplifier Push-Pull Power Amp MM Phono Tube Amplifier Balanced XLR 2022 Remote . with it's wiper returned to gnd, your amplifier never ever will delight you with playing music. 2nd, I'd wire the EL34/6L6 560R cathode resistor between pins 1/8 to gnd and switch a 910R in parallel as the KT option. Is it correct to interpret that I have oscillation around 1 Hz area? KT88 schematic. add a review. Audio Transformer is PMF-20S,FC-20S(XE20-S),H20-3. El34 Pp1. 179. I'm looking for a "simple" schematic for a power amplifier circuit that can run a pair of KT88s in push-pull. The schematic ended up just showing the KT 88. Atarashi originally built this amplifier as the fixed bias EL34 Class B Push-Pull monaural amplifier featured on the January 2003 Issue of the "High-Fidelity Audio: Radio Technology". Instead, let me quickly point out the highlights. I recently bought a nice PP KT88 Amp, but even in Triode mode, it doesn't produce true Triode sonics. schematic - George66. With a number of different KT88 tube amplifiers we have had good results using new I already have the acrylic plexiglass for the custom chassis and have begun assembly, and now I'm looking for a good schematic for a single-ended EL34 or KT88 stereo looking to build my own amp and intending to use 4 kt88s struggling to find a good schematic for it though so any help would be apprieciated! Mr. Diy Single Ended Se Kt88 6l6 El34 6ca7 KT88 start up Gingertube I still have not rounded up a scope but presntly waiting for the signal gen to arrive. Sign up. Hope someone here might be able to help. Actually this Amplifier is good for EL34 and KT88(6550). El34 Double Pp. Specifications. After a lot of research, I decided to use an elegantly simple Kegger schematic that he said was one of his favorites. Next, post a complete and accurate schematic of the amplifier. two comments on your schematics: 1st, if you actually wire your step attenuator this way, i. The 6SL7 driver / Push-Pull (PP) 6V6 / 6V6GT Tube Amplifier Schematic. Weight: 23kg. The dynakit ST70 input stage uses a 7199 tube. Joined 2010. Tube SE 6L6 EL34 KT88 Amplifier Stereo PCB | eBay I was looking to this chinese boards for tube amplifiers. I have not built this exact amp (using 2 KT88 per channel), but have I'd be happy to share my "build" schematic with you on that one as well if you'd like to see it, And since you're building a KT88 amplifier (You have the tubes) I'd shoot for at Mono Power Amplifier. Dynaco Dynakit Mark III Tube Amplifier Schematic. com. 2022-05-06 8:16 pm #8 2022-05-06 Today I explore why that is and share my thoughts on this KT88 integrated. schematic - adieu31. jpg (138. Price is based on $1045 incl. The output tubes do More Single-Ended 6550 / KT88 Tube Amplifiers. Other input tubes can be used in the driver stage, the closest match being a 12AX7 which will provide more gain. Push Pull Pp El84 Amplifier Schematic Ecc83 Input. Diy Kt88 6sn7 Push Pull Amp Part 1 Jkx Home Kt88 or EL156 I think you are referring to a later amp that Allen developed, not the PP-1c or PP-2c. Push Pull Amplifiers Working Advantages And Applications. 12ax7 , Tube amplifier made. Which, almost invariably being Tango and/or Tamura, is breathtakingly expensive. it just. Diy Guitar Amp. I want to use the 1650p as the output. You don't need to understand at all how does it work (despite being advisable), you just get the schematic and assemble it as it is drawn. TVA-10. WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES. Your high-power schematic looks very intriguing! One thing worth mentioning, concerning Japanese magazine schematics, is to use the specified iron. K. Save. 2 KB · Views: 848 PRR. I'd prefer fixed bias operation. Title: KT88 Author: GEC England Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:37:10 PM What are some of your favorite PP 6550/KT88 designs? I'm using Lundahl LL1679 output iron which is rated at 100W and 4. I found this KT88 circuit and it got me thinking, would putting a couple KT88s in parallel be a bad idea? Does anyone have any recommendations for a class A amplifier schematic that could do 30 watts? Any advice is appreciated. ) Route 66 Layout. The mighty KT88 is a lesser known tube to some that falls somewhere in between an EL34 direct-coupled to a cathode follower. Thread starter leland331; Start date Jan 8, 2017; L. diyaudio. Could you share your full schematic? artosalo. The Dynaco Dynakit Mark III amplifier is rated at 60 Watts. 300b single-ended (se) tube amplifier schematic (6sn7 input), 300b single-ended triode (set) amplifier schematic. Attachments. KT88-based Push-Pull Amplifier. More Single-Ended 6550 / KT88 Tube Amplifiers. The kits were totally complete with excellent instructions and the correct amount of What are some of your favorite PP 6550/KT88 designs? I'm using Lundahl LL1679 output iron which is rated at 100W and 4. 2010-01-10 7:11 pm #16 2010-01-10 7:11 pm #16 That's a really nice amp. If you are willing, build a push pull amplifier; if it is mono-blocks, Hernia Insurance is not needed. ) Logged Hello All, I’ve recently picked up a pair of Tamura F-925 PP output transformers (5K, 30W, 200mA, UL taps) to build a stereo amplifier. But if built as conceived, it will work at its best. Ella Push Pull EL34/KT88 Amplifier Schematic · Manual Bias when you place an order. For this amp, Allen initially used an EL509, but changed to the EL156 then KT88. Ella Push Pull El34 Kt88 Amplifier Schematic Diy Hifi Supply. Tim is some kind of doctor in autralia. 00. With a number of different KT88 tube amplifiers we have had good results using new production JJ KT88 Blue Glass and Genalex - Gold Lion KT88 tubes. troubleshooting and testing of these amplifiers should only be performed by someone who is thoroughly familiar with the safety precautions around high voltages. T. It is a fact that I am not happy with commercial amplifiers , and most do it yourself designs tend to be better ,but are full of economic compromises WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES. The Dynaco Dynakit Mark III is a mono-block amplifier with a 6AN8 input stage and a push-pull KT88 output stage. very clear but output transformer are small 7 Wrms so I got around 6. In the schematic a resistor of 4K7 connects the cathode of the KT88 with the cathode of the 6J8P/6SJ7. 176. Explore. The KT88's filament is 2 & 7. I was a distributor for the original GEC tubes in the 70s and 80s. BG157 - New series on how to build a KT88 Single Ended Amplifier. MOV's comparable KT88 came out in 1957. A few years ago, I would not have thought to myself “I should review a Chinese made tube amplifier”. Single-Ended (SE) KT88 / I had a pair of the Quicksilver KT88 amps back in the 1980s. please vist above site new EL156/EL34 Single Ended Amplifier. and small transformer so does not get good low edge. From . Tubes / Valves. The voltage gain (input) stage is a common Shunt-Regulated Push-Pull (SRPP) amplifier using a 5751 miniature dual triode valve. During these exceptions the same perfect quality should be Tube Sound is all amplifier dependent and subjective. They do sound different as well. 3k is recommended for a kt88 in a conventional push-pull output stage with fixed bias running Class AB1, but the OddWatt is none of the above (except for the kt88 part). The only 303 based amps I have heard are two Audion Silver Night monoblocks, which I repaired for someone quite a while ago now(PSU Filter capacitors Faulty). El156 Kt88 6550 Kt90 Then Kt120 Single Ended Amplifier D I Y. Schematic. Planning to add fuses on the filament secondaries and HT secondaries. 3v ac . Hello, i recently posted a thread about an organ amp and power supply i recently aquired. 5k tap,i test kt88,and kt120 tubes. I have the problem with my KT88 PP stereo integrated amp to set bias voltages of KT88 of which scheme as below; troubleshooting and testing of these amplifiers should only be I am still working on making full schematic of the amp which came to me from China w/o it. To the right is a conventional configuration, which obviously works fine (see plots above it) to the left the cathode follower configuration as I *think* it should be connected, but as you can see from the plots above it something doesn't work as planned. Here I am using a 10Kohm UL central tap instead of 4 - 5Kohm normally used for the KT88 in commercial amplifier. so start build up KT88 single ended amplifier by Tim. It sounds amazing While I was working on this, I looked at a bunch of KT88 circuits and didn't see any using a 211 Se Amplifier Schematics LampizatOr 211 TRUE BALANCED Amplifier THE TWIN TOWERS. Since Amazon was out of stock, I chanced it and purchased it from China-hifi-audio, Stereo Power Amplifier. Power 10W. Tung-Sol designed them in 1955 as a low-cost, high-power audio tube. baudouin0. 196. KT88 SE schematic. The KT120 tubes sounds very good,but i like more the kt88 sound,and 6550 ,not bad!I use 420v for power tubes,and about 186v in drive tube,please take a look in RH6550 SE amplifier thread for more details and This tube amplifier is scaleable and can be used with 6V6, 6CA7, EL34, KT66, KT77 and KT88 output tube. Updated the silkscreen and schematic to be more readable; 6L6, or KT88! Specs for the whole amplifier, with various tubes in ultralinear operation, 6600 ohms plate-plate: Svetlana 6L6GC Ultralinear: Sovtek KT88 Ultralinear: Here I am using a 10Kohm UL central tap instead of 4 - 5Kohm normally used for the KT88 in commercial amplifier. In this amplifier you can use only KT88 Figure 1: OddBlock KT88 Series 1 Tube Amplifier Schematic The voltage gain (input) stage is a common Shunt-Regulated Push-Pull (SRPP) amplifier using a 5751 miniature dual triode valve. com/Schematics/ ematic. 4. kodabmx. Power output Signal to noise ratio: 90dB (line) Speaker load impedance: 4Ω to 8Ω. Home. I haven't really delved into doing a lot of building or mods though. KT88 Single-Ended 1. 3 out of 5 stars 115 ratings | Search 8417 Quicksilver If memory serves me correctly, there were three versions of the 8417 amp. Help Me Too Choose 6l6 Push Pull Build Telecaster Guitar Forum. You were looking in the wrong place for the phase splitter. Hoffman Amplifiers Tube Amp Forum, Layout thoughts, KT88 SE build. Class A Push Pull Power Amplifier. Schematic by Jean Hiraga, published in L'Audiophile 14 (January 1980). The 6550 is not a substitute for the KT88 in all amplifiers due to mostly screen voltage considerations. About. this amp is the quintessential triode amp. I have searched the forums and have not been able to find a specific reference to the purpose of the 5H 250R choke and 10uF cap for the 6N1P plate as shown on the schematic Quicksilver KT88 schematic Now I know this is a really old thread, I owned a Quicksilver KT88 amplifier in the 1980s and drew out the schematic at that time. 4 Watts total In this case ONLY the 6L6GC or KT88 would be advisable because of the high voltage on the ultralinear taps KT88 start up Gingertube I still have not rounded up a scope but presntly waiting for the signal gen to arrive. I was wondering if anyone could supply some more details than the diagram provides: Mullard EL34 Push-Pull Tube Amplifier Schematic Like: - The voltages at key points - The voltage ratings for some of the electrolytic caps that are not mentioned Stereo Integrated Vacuum Tube Amplifier. on 2020 The only schematic I've seen shows them as 0. I have looked at many schematics but have not come up with anything as of yet. One thing about DIY audio is that it is a journey, not a Mikael Abdellah's Single-Ended (SE) KT88 Tube Amplifier Schematic. Now i'm looking for good schematic in order to build SE amp (hi-fi) with the following parameters: up to 6-10 Watts per channel, KT88 or KT88 schematics exist in hundreds, just take Dynaco MkIII as one. You should be able to use that PTX as far as the rectified DC current is concerned. vendors (Billington AFAIR) is touting the 12E1 and/or the S11E12 (capless version of the 12E1) as a substitute for the KT88, The schematic is not published but available to those who buy tubes off them. Brand: MUZISHARE. Also, I was looking at the hammond 1650RA and 373HX and I was wondering what others were using and if there were any issues with this particular design or Beautifull hi end PP KT88 design. SE KT88 Tube Amplifier Schematic (6N1P driver) by Mikael Abdellah; SE KT88 Tube Amplifier Schematic (12AX7 driver) by Jean Hiraga; SE KT88 / 6L6 / EL34 / 6CA7 Tube Does anyone have a schematic and photos of a good 845 SET Amp? I've built a 6N1P/KT88, and 6SN7/300B SET Amps, and I'd like to move up the ladder for the next project into ultimate Triode territory and 1kV land. Any help will be greatly appreciated. This video will help you pick easy to KT88 Valve Tube Amplifier Single-ended Class A Stereo HiFi Amp DIY KIT 16W+16W | eBay (Not 2 & 7) See the schematic near the lower left edge below the transformer. El34 Tube Amplifier Schematic I bought (maybe foolishly) a Boyuu EL34 A9 amplifier as a kit. Looking to achieve 90 watts. Since the Tamuras should be nice transformers, I’d Title: KT88 Author: GEC England Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:37:10 PM Single-Ended (SE) KT88 Tube Amplifier Schematic (with 6N1P driver) Mikael Abdellah's Single-Ended (SE) KT88 Tube Amplifier Schematic. f. 37 kB, 640x428 - viewed 389 times. NOW A CHOICE OF TWO TUBE AMPLIFIERS - KT88/120 & EL34. I ordered a PCB from china single ended KT88 HiFi. Thread The amp started life with a 6N1P driver tube and a KT88 in each channel. The scheme of a push-pull amplifier (the input stage and driver which made based on this scheme, developed by genius of sound - Nobu Shishido (WAVAC audio lab)), was developed by famous tube designer - Michael Bron, ideas and sensible comments which helped me to implement this project, for which I am Hello guys I found this schematic online actually on YouTube I saw the video and the guy post a link of the schematic I copied KT88 V3,V4 4. Schematics for the Amp and Power Supply and a "brag" document can be found on the Projects pages of Evatco website. All the amplifier in ULtralinear connection. 6 V anyway. Tube SE 6L6 / EL34 / KT88 amplifier stereo PCB ! Write a Review The schematic is shown below for reference. For more information about his latest tube amplifier project, see the OddBlocks - Class-A Push-Pull KT88 Tube Amplifier (12SL7 Driver) project. 2019-09-04 7:21 pm Ketje - that schematic looks great but absolutely requires 807's as it's B+ will be somewhere north of 700V. The changes were due to commercial availability of tubes for production. Seems the KT88 is every hifi nerds wet dream. Using psud2 I'm getting around 450 when using a 400 volt transformer with 5AR4. Joined 2017. Dimensions: Jean Hiraga 12AX7 Single Ended KT88 Tube Amplifier Schematic . We even ran the SMGs with the MC-30, built with two 6550 using McIntosh's unity-gain coupling. User Login. Atarashi originally built this amplifier as the fixed bias EL34 Class B Push-Pull monaural amplifier featured on the January 2003 Issue of the "High-Fidelity Audio: Radio 4. Push pull has minor distortion than SE Amplifier. As usual I try to do things as good as I think can be , and this design includes lots of experience and very sound solutions . KT90). It's hard to argue against the classic Williamson - rongon. Scan of the Dynaco Dynakit Stereo 70 (ST70) Tube Amplifier Schematic from the instructions manual. Open Baffle. I've updated the original schematic to fix the symbol for the KT88, so it should be correct now. I assembled one channel on test bench and it seams that it works fine. EL34 of EH and Telefunken(Siemenz)getting very much musical sound. The input stage uses a 5751 dual triode in a Shunt-Regulated Push-Pull (SRPP) circuit. Right now, I’m waiting for the power transformer Jean Hiraga's single-ended KT88 tube amplifier schematic with 12AX7 (ECC83) tube input stage. 83 KB · Views: 2,093 KT88SE Inside Wiring. Please login or register. Without feedback the amplifier works fine but with feedback applied the output valves Schematic with 2x ECC83, 1x ECC82 & 4x KT88, 70-05-12 (Unicord, 1970). e. Email Hoffman Amplifiers Tube Amp Forum, using KT88 tubes. My KT88 Williamson Amp Build. You should strictly state all these are only your observations. The old Rule, is either Double the amplifier power, or live with what you have (3dB more power). I would probably do it a bit differently if designing it today BUT it may give you some ideas. The saying, “the [] Schematic. 3 out of 5 stars 115 ratings | Search this page . I had a pair of the Quicksilver KT88 amps back in the 1980s. JPG. Thanks for the help. I have read that 6550's were designed as military servo amplifier tubes too, but according to Eric Barbour, that isn't true. I'm used to building electronic kits with good plans but the Boyuu comes with a schematic wiring. 2A3 Single-Ended Triode (SET) Tube Amplifier Schematic Single-Ended (SE) KT88 / 6550 Tube Amplifier Schematic Mr. 2018-08-02 11:35 pm #4 2018-08-02 11:35 pm #4 Thanks Hollow state, I just saw and realised! I am a newcomer to the world of tube/valve electronics, and I have built the KT88 based single-ended amplifier based upon Alex Gendrano’s design, which in turn was based upon Mikhail Abdellah’s design. BTW, I have a Kimmel/Welborne ST70. Schematic, (Radford, 1967) For more information and the history of Radford amplifiers see the Radford Revival site. Joined 2011. A schematic of the SE KT88 tube amplifier that I have built is shown below in Figure 1. -User Name cleaned up the schematic and adjusted power rail resistors to comp for the lower B+. The output stage is a Self Inverting Push-Pull (SIPP) amplifier that uses KT88 power tubes. I've seen loads of schemes on KT88 It's derived from taking a single KT88 output version, measuring with a scope till clipping, then doubling it. jpeg. Been searching for 2x KT88 amp schematic and came across this topic which is exactly what I'm looking for but no schematic. vishalk. Beautifull hi end PP KT88 design. 2 KB · Views: 1,002 C. Quicksilver KT88 amp. jpg. I have been searching for some time and can’t seem to find one anywhere. However, I have one question on the power supply schematic. However, it greatly simplifies the endeavor. Schematic Dynaco 6bq5 Amplifier Ampslab Com I recently watched some YouTube videos on the Willsenton R8 KT88/EL34 integrated tube amplifier and decided to purchase one. D. I attached two images with the schematic for simplicity. 7 mA Va = 535V (for 6550 or KT88) Pa = 43. KT88 ISSUE 3 The KT88 has an absolute maximum anode dissipation rating of 42W and is designed for use in the output stage of an a. Thank you very much and a happy new year to everyone. I already have the acrylic plexiglass for the custom chassis and have begun assembly, and now I'm looking for a good schematic for a single-ended EL34 or KT88 stereo Need lots more help in the Kt88 Hammond circuits I have looked at the dynaco III amp circuits. Radio Design. 2 KB · Views: 133 B. I'll also second Frank's message - these are nice sounding amps. Log in. Valve complement: 4 x KT88, 2 x ECC81, 2 x ECC81. DIY Single-Ended KT88 / 6L6 / EL34 / 6CA7 Tube Amplifier I worked through the calculations and have a fairly good understanding of the amp schematic. 2nd harmonic is make good tone for Music. Building, May 2020 kt88 SE schematic. top of page. Williamson. I suspect that the KT88 schematic is almost identical. N. The only 303 based amps According to the schematics, 0,4 V is the correct setting for the KT88 tubes. KT88 SINGLE-ENDED STEREO AMPLIFIER Stereo 6-8 Watt/channel Single-Ended Zero-Distortion *Prototype sold – taking pre-orders for production units. Visit. Watch. kt88music. Schemo_Route66. Michaelson and Austin Power Amplifiers. You want to tune it, or make modifications? OK. Welcome To the Hoffman Amplifiers Forum November 16, 2024, 02:52:04 Anyway, I've spent a few days trying to work out a layout for Dummyload's KT88 reverb schematic that isn't too convoluted. Otherwise, you will need to trace out the complete and accurate amplifier schematic, I have just completed the enclosure and started wiring the power circuit. Single Ended Valve Triode Amplifier has not same tone with Push Psu Amplifier. Joined 2004. For many years the KT66 valve has been regarded by many as the hall-mark of a high-quality amplifier whether home made or commercially manufactured. 69Vrms. The sound is a little bit muffed, but still experimen Looking for kt88/120/150 schematic. The amp I chose to start with is Alex Gendrano's KT88 SE. I just completed building Bob Latino's fabulous M-125 (125 watt per monoblock) tube amplifiers. pastisch. 4 KB · Views: 102 soundbrigade. The original 8417 version used one 12DW7, a dissimilar dual triode (12AX7 single I just completed building Bob Latino's fabulous M-125 (125 watt per monoblock) tube amplifiers. S. Building, troubleshooting and testing of these amplifiers should only be KT88 12/1 KT170 7/1 6LW6 24/1 6DQ5 24/1 EL34 7/1 6JA5 25/1 I would say the KT170 does not appear to A step by step build of a single ended KT88 Stereo DIY tube amplifier. I am looking for a schematic diagram for an old TAC KT88 push pull amp. 5A . Pinterest. I've been reading in the forums about a KT88 amplifier schematic from a Mikael Abdellah. SE KT88 Tube Amplifier Schematic (6N1P driver) by Mikael Abdellah; SE KT88 Tube Amplifier Schematic (12AX7 driver) by Jean Hiraga; SE KT88 / 6L6 / EL34 / 6CA7 Tube Music Angel XS-SE Amplifier(Again!) Andy, you have the advantage over me in that I have not heard the MA KT88 amplifier alongside any of the others. We will serve it for you but it's first-come-first-serve. Description: I decided to amplifier builders (Last update :18/Nov. I'd like to get my feet wet by building a couple simple single ended triode 2 x KT88 would be being run really conservatively High Voltage Rail of 450 V min @ 250mA for one channel Repeat the above for the 1650P Raa = 6600 Ohms Ra= 1650 Ohms Vpk = 445 Ipk = 269. I came across the GEC KT88 100W ultralinear schematic which seems reasonable to my untrained eye, but I don't know about the transformers. Small signal valves are B339 and B329 (). The STA-100 used 2x ECC88, 4x EF184 & 4x KT88 tubes. Please Note: KT88 Works Both as Integrated & Power Amplifier If that is the kind of sound you are into, then this is the Push-Pull amplifier that will change your. Shop. Schematic diagram is next, Perche Drive KT88 Single Ended Amplifie schematic diagram is above,perche drive Jean Hiraga 12AX7 (ECC83) Single-Ended KT88 Tube Amplifier Schematic Push-Pull (PP) EL84 Tube Amplifier Schematic (ECC83 input) Posted by Kidu at 4:21 AM. Nikon1975. Forum Home Amplifiers Solid State Pass Labs Tubes / Valves Chip Amps Class D Power Supplies Headphone Systems. Could I'm looking for a "simple" schematic for a power amplifier circuit that can run a pair of KT88s in push-pull. The input 6DJ8 and MJE350 transistor define a two-stage compound amplifier This is the kt88 obbblock schematic I will use except that mine will have thermal delay tubes instead of a timer chip (OUCH) Post subject: Re: KT88 OddBlock amplifier from Just finished up a SEUL KT88 amp that uses a 6EJ7 to drive it. are the KT88, KT100, KT120 and KT150 Tubes safely interchangable generally speaking in a well built tube amplifier? The KT120 and KT150 are both pentode devices and the KT88 and KT100 are described as beam tetrodes so no, I wouldn't think these can be easily interchanged even though the data sheets have the same "pin-out". Auto-bias module is not available. With a total anode-plus-screen dissipation of 28 Watts, when operated with cathode bias, its power output, Kt88 Tube Amp Schematic. jpg (66. If you bias the KT88's at 75mA as Mikael specifies in his schematic you'd be at 160mA. one by one. Schematic diagram of Neumann LV60 cutting machine (Since 20th/feb/2009) This video describes how i built push pull KT88 integrated amplifier with phono stage. Amazon sells it for $1500 but you can buy it directly from China-hifi-audio for about $900 plus shipping (in my case, it was about $330 to Hawaii). I'll probably have to sub for the 6J5 and U19 (2x5R4WGB?). Running on the cool side for long tube life. mbrennwa. David Theodore Nelson Williamson was born 15 February 1923 and died 10 May 1992. Quote from: LooseChange on June 25, 2011, I used a CAE Dynaco MK4 front-end board to drive 6SN7 cathode followers to drive 2 pairs of KT88. MC-10L. 6v6 Pp1. Other input tubes can be Schematic by Jean Hiraga, published in L'Audiophile 14 (January 1980). Mostly SS but some tube stuff. Joined 2007. I've seen loads of schemes on KT88 amps, but without any ton-control. DIY Single-Ended (SE) KT88 Tube Amplifier. The amplifier is pictured in Figure 1. Mikael use 560 ohm giving 70mA,I proposed 330 ohm for 90mA giving a little bit more power. He was elected a Fellow of the Royal Society (F. 3V 3. The photos below are of Bernardo's DIY Single-Ended KT88 Tube Amplifier following Mikael Abdellah's schematic. Class B Power Amplifier. STA-100 Stereo 2x 100W Power Amplifier. The topology comprises two dif - ferential amplifier stages in tandem and avoids the use of an explicit phase splitter stage Sorry if my post caused any confusion. I purchase the tubes from him too: a quad of matched KT88 and a The scan below is the Dynaco Dynakit Mark III tube amplifier schematic from the instructions manual. That circuit simply can not work. Complete schematic. Manal Bias. Log in; Create new account; Request new password; Hi All, My current project is a 12AX7 - KT88 single ended amplifier http://diyaudioprojects. kcpoftswujirthvbbqzeauhqkltqqoqdfdgdrcbaefobswa