Kt88 se amp. xtian Posts: 7122 Joined: Mon Apr 19, 2010 8:15 pm .

Kt88 se amp com ) and www. Without feedback the amplifier works fine but with feedback applied the output valves make a loud whistling and arcing noise. 2+ (www. I have built three of this amp already. P. zlab. I have used these in so many builds and always sound excellent. hi all, I am collecting parts for a build of the se kt88 shown on diyaudioprojects. Mikael Abdellah KT88 Single-Ended Tube Amplifier Schematic. The default configuration of the amplifier is 3*6N8P tubes, PSVANE 4*KT88 tubes . S. As I already have the EL34 tubes and the power transformer to go with them, Also, the design process is all *** backwards. xtian Posts: 7122 Joined: Mon Apr 19, 2010 8:15 pm Here's my with out KNB EL156 SE Amplifier Final circuit for EL156 Single Ended Aplifier update 11st May 2009 EL156/6550 Single Ended Amplifier Name is Gen V2 But I Like Sound of KT88/6550 Single Ended Amplifier. SE amps have lots of 2nd harmonic, and P-P amps have very little, since much of it gets cancelled. Maybe you can help, my problem is how to change the gain of push-pull amplifier (marantz PM 44 SE) to be equal to my SE amplifiers. Perhaps a statement of 'I like this KT88 SE amp I have, but I want to drive these 87dB speakers' is a better design starting point. A rarely seen on the used market Aric Audio Special SE KT88 amp, purchased new in September, 2017; I am the original owner. The KT88 uses cathode bias. That may just be the SE amp. Currently I'm using a 6N1P which I love and have used in three different SE amps. I have plugged an Amperex 6dj8 on the 6n1p position, but I like the 6n1p sound better! I Hello, Community. It will take a while to go through all the videos but it is worth the time. My knowledge of electronics theory is limited (relating to valve tech) but I'm confident with a soldering iron, as well as following basic safety guidelines. -User Name-Password Home; Help; Search; Login Figure 1: Single-Ended (SE) KT88 Tube Amplifier Schematic with 6N1P driver stage. Whether you're tinkering with the venerable 300B, an EL34 or a KT88, SE Amp CAD can accurately predict its performance with a host of transformers. Posted: 22 Mar 2012 7:31 pm . 95', 'brand': 'Tube Amp Doctor GmbH Figure 2: Power Supply Schematic - OddBlock KT88 Series 1 Tube Amp. En dat is ook het probleem. I'm in the process of gathering parts for this amp and see that Mark has closed his site, and things are rather quiet over at AK. Welcome To the Hoffman Amplifiers Forum December 14, 2024, 05:13:01 pm: Welcome, Guest. We cover both the amplifier section as well as the power supply. I'm not too worried about distortion at higher powers but a reasonably clean 5 to 6 Watts would be great. This is the kit: KT88 Valve Tube Amplifier Single-ended Class A Stereo HiFi Amp DIY KIT 16W+16W | eBay And the instructions it came with are rubbish! Post subject: Re: KT88 SE Amplifier. No blown fuses. That's about 40 weeks X 50 hours = 2000 hours. I find triode strapped is better than UL. Please login or register. M. One has a This is a complete redesign of my popular Super KT88/120 SE amplifier, which extends its performance in power output and sound quality. His design was based around Mikael Abdellah's KT88 SE Tube Amplifier design from 2003. One of my audiophile buddies said it was the best tone that he had ever heard in an amp. 7v LED's instead of the 2v ones here to gain a bit of current now) That is the basic circuit I've been running on SE Pentode amps running in UL mode. It is said to be the quickest, easiest way to model, evaluate, and understand single-ended tube output stages. For as single ended amp, I think the KT88 family of tubes may be better. A picture of his finished KT88 tube amp is shown below. hifiandaudio. Shall I get him modify and change out the input tube to accommodate an ecc83/12ax7 tube? You have 1 wire for the B+ , 1 wire for the ground, 2 wires for the heaters, That is about it. And re-case and get it singing again 4years later. A 6DJ8 / ECC88 tube can be used in place of the 6N1P tube with good results. The high-demand friends can replace PSVANE 3*6SN7-SE tubes and upgrade to a full-service tube configuration. 8Watts vs 14Watts. I'm building a KT88 SE amp and would like to use a 12AT7 SRPP as a driver for the KT88 and a 2nd SRPP to drive a spring reverb tank. In my initial inspection, this KT88 based vacuum tube amplifier is made with all used components inside. KT88 - Single Ended Tube Amplifier Build 2018 - Part 1 - YouTube ray . Alex has put together a single ended (SE) KT88 tube amp. Looking at 450v on plate of KT88. You have more choices for tube rolling (there is none in the 120 family). Projects. then started build up KT88 Single Ended Amplifier. . 2020-08-08 6:08 am BG218 - Detailed walk through of what each component's purpose is in the amplifier. So you schematic hounds out there in forum land, hunt me down a good 6SN7/KT88 SE amp or a simple 6SN7 driver stage. I just want to have a good tube amp so sometimes I can listen a tube sound. But there are a few nice looking KT88se and EL34se out there Decware's model SE34I. Dear Colleagues, My father and I made our first SE tube amplifier and now are preparing to create a more powerful KT88 PP. Tech stuff aside, the I breadboarded a SE KT88 amp using a 6SL7 into a 6SN7 as a cathode follower which drove the KT88. It was manufactured in the U. Gain stage for SE amplifiers is tube preamp (gain about 30) tube an replace it with (2) 2v red LED's in series, also 1. zintolo. Do you think these amp would be a good project to give a try? It look nice to me but I'm familiar with solid state amps. I’m wondering if any experts can recommend a driver circuit for my SE (Tetrode Mode) KT88 amp? Background- this amp started as an Audio Note Kit 2 SE 6550 amp. My budget is 1,000 USD for amp and speakers, and I'm blowing 550 on the amp. It worked fine and sounded fine but didn't sound better than using a 6N1P and it added unneeded complexity and required a beefier PS. This is based off the popular Kegger/Abdellah/Blueglow build with a twist, using a pai Lastig. 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 I know more KT88pp amps exist then then do KT88se amps. The saying, “the first Watt is what really counts” can be expanded at American Tube Amp to ‘the first 6 Watts’ – which are pristine in fidelity! DIY Single-Ended (SE) KT88 / 6L6 / EL34 / 6CA7 Tube Amplifier. This was a modified EAR-859 design with variable positive/negative feedback at the end, Class-A operation and KT88 grid-driven (also called ETM=Enhanced Triode Mode by Tim History behind it: I had built Kegger's KT88 SE UL (6EJ7 version) several years ago. Here are my specs: HV: 350v Rk: 220 Ck: 1uF Rg2: 470 Rstop: 1k Rg1 (in series): 5k Rgshunt: 200K pot Transformer: SE Edcor 3K primary. Joined 2009. Inter-stage caps also on hand and are Russian PIO greens. The IEC socket includes a 3 Ampere fuse and an EMI filter. I stumbled upon Bob Cordell's KT88 amplifier presented in Linear Audio. Mikael Abdellah KT88 Single-Ended Tube Amplifier The popular single-ended (se) KT88 tube amplifier schematic by Mikael Abdellah. Here are I would like to build an SE amplifier with two parallel KT88 output tubes. Client's idea is to use the head as a low-powered practice amp, and then, by running line level signal out of my amp and into a 300-watt, solid state amp, to power his large speaker cabs, making good use of preamp and power tube distortion to color the signal. But I want to build a few different driver stages and the next I want to build is a 6SN7 stage. The circuit that I use to build my KT88 SE is that of Mikael Abdellah of this forum. Anyway, I'm going to need some speakers for it. I'm getting ambitious and want a winter project for after Christmas. Im shooting for 15-20w. The KT88 also can handle larger plate voltages, up to 800 volts. I have not built this exact amp (using 2 KT88 per channel), but have other parallel single ended amps though. Z. Another similar schematic is available in the 6550 amps section. Finished wiring and powered up today. Ex-Moderator R. It sounds amazing While I was working on this, I looked at a bunch of KT88 circuits and didn't see any using a 6SN7 driver. Because of this problem, they are not recommended for SE amplifiers, and with push pull designs, the two currents must be very carefully balanced to cancel out the DC-caused magnetism in the core. 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. Now i'm looking for good schematic in order to More Single-Ended 6550 / KT88 Tube Amplifiers. tinitus. Spec said 300B Single Ended Amplifier has 8W rms so on but real is 6. (actually 1. Some members have build it and they had excellent results. model B-5A ; 300B / KT88 switchable combo single ended tube amplifier. Er zijn zoveel ontwerpen! SE of PP? Triode, penthode, ultralinear. Jean Hiraga's single-ended KT88 tube amplifier schematic with 12AX7 (ECC83) tube input stage. The builder made the speaker outputs with RCA plugs instead of binding posts so I am sending it off to a tech buddy to change these out. you must know. Working on a schematic for a E80CC/KT88 SE UL amp,and I thougt this might be my thread for newbie questions. Run in class AB1 push/pull, a pair of KT88's are capable of producing 100 watts at 2. If this version doesn't work out, it will be pretty simple to rewire the driver circuit to the "blueglow" version of this KT88 SE. Wat ik wel ken zijn de bekende termen: KT88, 300B, SE waarbij de laatste zo ongeveer als de heilige graal word gezien met een KT88 als waardig alternatief. Excellent condition, physically and operationally. KT88 Single-Ended 1. 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 I am in the process of building my first tube amp, a single ended KT88 based on Alex Gendrano's design with some minor changes influenced by porkchop's design. anyway edcor has the transformers, the link Im sending has the transformers at the bottom match I recently built the blue glow/Kegger SE KT88 amplifier. this is story of build up Tim's KT88 Single Ended Hi everybody, recently (abot 2-3 months ago) I started a thread here with a monoblock design, each block built with 1x E88CC + 1x ECC99 double triodes and with 1x KT88 end pentode. That's twice the output of an average pair of 6L6 tubes. It might be Porkchop's (porkchop since you just did a build like this one I am ga('set', '&cu', 'EUR'); ga('ec:addImpression', { 'name': 'KT88-STR REDBASE TAD Premium Matched', 'id': 'RT891', 'price': '73. I've a SE power amp running either KT88 or 6550 in triode mode (triode only) and it certainly doesn't sound uninvolving nor slow. They dropped right in and wow, they took this amp to a new level, but it wasn't optimized for the bigger tubes, nor did it have big OPT's. My question is when you tube roll the amp, when you use kt88 tubes the cathode current is approx 76ma. SE Amp CAD. And pulling an output tube the only real difference I can discern is the output power when pushed/driven hard. KT88 SE amp project Hello I want to build a KT88 SE amp. 66-1. Some really good candidates to take inspiration from are Mikael Abdellah's SE KT88 project which has got high accolades. decware. An updated input/driver stage, upgraded output transformers, power supply filtering With various KT88 amplifiers we have had good results using the new I find that my KT88 SE amps play as loud as I want 99% of the time when paired with either Dynaco A25 or Advent/1 speakers (neither is particularly efficient). Lynxo323 Post subject: Re: KT88 or K120 be amp. I just built a SE amp which started with KT88 but found the Back Sable EL34s gave more power and and better frequency response. The amp performs OK on the test bench putting out about 10 watts before visable clipping on the scope. , Genalex Gold Lion. Our KT88 SE Stereo Amplifier has lower distortion than a SE triode amp. Link to Hey all! So I finally made a decision about what amp kit to build for my very first tube amp project! I'm building one of scott17's KT88 SE amp kits! In the build log to follow, I'll be detailing the build process. Have picked up a Mikael Abdellah's KT88 SE amp build. The vendor only supply a schematic for KT88 and did not reply when ask for the EL34 schematic. I'd be most grateful!! _____ Haven't listened to a KT88 PP amp, but own two KT88 SE amps. So was curious if anyone here has been building or has any tweaks for this while I'm still researching. Hello all, I have been keen to start a single ended KT 88 project for some time I found the blueglow amp after much searching and especially liked Marks you tube videos, 13 or so for this build. (mail got early 2011) he said " May I brew KT88 Single Ended Amplifier by myself ?" I said: nothing problem. ( Finals tubes were : 2A3, 45, KT88 and 6005 ) I am only guessing that the ultra high Ohmic value, of the Final's tube Rk, protects the Finals tube if it is at zero bias voltage. One has a single KT88 in each channel and produces 14-15 wpc, the other uses two KT88 per channel in a parallel single-ended design and produces 23 wpc. Joined: 20 Mar 2012 1:22 am Posts: 168 Location: Wales, UK Hi, Thanks for making the changes to my schematic and for posting it back on here. by the MOV (Marconi-Osram Valve) subsidiary of G. It One of the Diyaudio member's built a SE amplifier with KT88 which has been What's the purpose of the 1 ohm resistor off the KT88 cathode? Easy bias Haven't listened to a KT88 PP amp, but own two KT88 SE amps. I used a B+ of 425V which is about what I have on my monoblocks built to Mikael's schematic. In all of the se KT88 / EL34 amps I have seen the the KT88 / EL34 are interchangeable. I am trying to simulate in Pspice/Multisim and I Hi all, I have been in a journey of learning with my first tube amp, since 2012. Don Allen is an underground legend in the hifi tube amp world. You might not willing to turn this amplifier ON with this poor safety condition. Further inspection, I found that this amplifier is a single ended KT88 with large output transformer. 2007-07-04 8:54 pm #9 The amp is question is Pete Millett’s Single-ended E-linear Amp. For a high power SE amp, the weight of the transformers, especially in a LCLC configuration, can be substantial so that is why i did it. Power 10W. The bass is a bit lacking though compared to other amps we tried (quite a few). Can be used in triode mode (about 9 watts/channel) or ultralinear mode (about 18 watts/channel) with the flip of a switch for each channel, and feedback is adjustable to your preference. From the examples I have seen you can As i wrote above, i would like to build an active system, using 4 SE amps to drive middles and highs and 2 push-pull for bass. Output power will be about 5W. 5% total harmonic distortion. I. Here is the amp, these about 12W I will be constructing an amplifier based on the infamous Mikael KT88 SE schematic that seems to be a favourite schematic to build. Y KT88 Single Ended Amplifier 2011-2016 I got a letter from Mr Tim Williams from Australia, 3 month ago. I asked for a pair of KT120's for Xmas 2 years ago, and Santa obliged. There is Using a KT88 in Triode mode gives a plate resistance of perhaps 800 to 1200 It's a high gain SE KT88 build crammed into a chassis fit for a Fender Champ. KT88 SE Circuits Hi. Some of these photos are during the build so they may not appear complete. I wanted to bring back the Bread Board amp (BBAmp said Be Bamp) but wanted it to look more than a science experiment. It uses a cathode bias resistor with a bypass cap as the bias method. About. In the internet, I have found several schematics (attached, including one from this site). The transformers and chassis will be available in 2 Man this amp has enough iron in it to make a small anvil! I thought the smaller box might just be an anvil. Hari Iyer, in 2021 with his 2020 KT88 SE DC amp, is another of the four. Unless you are stuck on SE amps, with 89Db speakers, I'd look at the OddWatt amps. E. "Toccata" - KT88 SE UL amplifier This simple two stage power amp was built from 95% parts on hand. other way 2A3 SE I have restored and rebuilt a leak stereo 20, leak tl12 plus, quad ii etc but never done point to point amplifier build or from scratch. Schematic by Jean Hiraga, published in L'Audiophile 14 (January 1980). Alex has made some changes, such as the ability to switch the amplifier between triode and ultra-linear operation. Just finished up a SEUL KT88 amp that uses a 6EJ7 to drive it. Posted: 17 May 2011 9:16 pm . I have done a couple of amps this way. Member. 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. 5 W rms. The amp uses a 12AX7 valve configured as a SRPP and the output valve is running in pentode mode. com has a fine looking KT88 se as well. The TT21 is an industrial KT88 with a top cap, so you need an adapter to use them in a KT88 amplifier but they can sometimes be found cheaper than the The KT88 was introduced by GEC in 1956 as a larger variant of the KT66. My question is . This is based off the popular Kegger/Abdellah/Blueglow build with a twist, using a pai KT88 SE Basic or Master Kit Photos I currently have 10 Basic Kits available for sale. C, also labelled as IEC/Mullard, and, in the U. 2k screen resistor on KT88. My question is, does the B+ go to the black lead, and the plate of the KT88 go to the red lead, or the other way around? I assume the screen (pin #4) of the KT88 goes to the 40% screen tap. Tonight: Reading the manual Soundtrack for this evening: Me'Shell There is a couple KT88 amps in there, push pull and a parallel push pull, I built the PPP and it is awesome, 120w and a great range, full. Amplifier & Power Supply I have built a KT88 SE amplifier but I am having trouble to get the feedback circuit to work. This is my first SE amp, I'm used of PP designs so this is a little different. He starts with design, My first amp from several years ago. I listen to everything from rock to jazz to classical. The schematic I am basically following is one i think i found on this forum. My SE KT88 is still one of my favorites, along with my RH84, my 12av5 SE amp and a 2a3 parafeed. D. Hoffman Amplifiers Tube Amp Forum, Layout thoughts, KT88 SE build. useable power is 6 W rms. Output Transformers for KT88 SE Build. My amp uses point to point wiring so R4 has been directly soldered to the valve socket. Geen idee wat het allemaal "doet". Managed to get it working 4years later, due to budget constraints. Top . Standard version：use vacuum tube 6N8P × 3+KT88 × 4 Updated version：use vacuum tube 6SN7-SE× 3+KT88 × 4 I bought a PCB which label "diy PCB for EL34 KT88 6L6GC FU7 FU50 6550" (SE amp). Now i'd like to advance myself in tube amplifier for speakers as Beta22 is more suitable for headphones. The harmonic profile of many P-P amps is dominated by the 3rd harmonic. I've already successfully built my first tube amp (SE 6n2p (12AX7) + EL84) and transistor amp (Beta22). I made another video about getting started on the build, component selection etc. 😀 - AlexG You should take a look at the following video which shows you how to build a KT88 SE amp in great detail. A step by step build of a single ended KT88 Stereo DIY tube amplifier. I don’t have much experience with the It's derived from taking a single KT88 output version, measuring with a scope till clipping, then doubling it. Joined 2003. Interesting thread for me as I have a pair of 88s and was looking to build a single ended stereo amp of about 10W per channel. Skunkie Designs. se 300b or pp Kt88 amps ? Which amps sound better, single ended say using 300B tubes or the more usual phase splitter (PP)designs, say KT88 ,EL34s etc? Is there a difference? I have been looking at music angel se 300B amps and comparing them to PP KT88s amps. I am using the KT88 in SE UL mode, it should give sufficient power and has rather nice distortion KT88 Bread Board amp with no driver stage. (on the original amp I'd at least drop that KT88 grid resistor down to 220K) ' ' Designing a class A SE guitar amp using a kt88. This time is a family The popular single-ended (se) KT88 tube amplifier schematic by Mikael Abdellah. E-linear amplifier I built the amp last year and have enjoyed it a lot. If I were to use say a 6l6gc or el34 this amount of bias current would be to much and cook the tubes. No wonder why this amplifier sound so wonderful. top of page. I’m wondering what the viability of designing a fender champ circuit with a KT88 tube for extra headroom would be Anyone think this is a good idea? Top. I know there are quite a few of threads like this but it takes time to search for just the right answer, so I hope you’d bear with me. Recently I tried to add CFB by putting the transformer secondary (8 ohms) in the KT88 cathode circuit (with the This is going to be a short video series on building a "Kegger inspired" KT88/6EJ7 Single Ended, Ultralinear amp using a Hammond power transformer and some E. Mains power enters the amplifier through an IEC socket located at the rear of the amp. The amp is switchable between triode and ultralinear operation, so I have probably run it about half-and-half in each mode. That first design shows the output tube with -28V on the cathode (and fixed bias on a SE amp), you are gonna end up with -40 to -42V with a KT88 and I'm not sure that cascaded 6SN7 will do it. Home. The voltage/current measurements have not changed. step by step by e-mail. 'I want 8 KT88 in triode and use these regulators I have already purchased, I want it to be unique and I want you to design it for me' is going to end in tears. com that was originally of mikael abdellah's amp. "Class-AB amplifier with foot-switchable overdrive/boost, foot-switchable master volume control and the ability to use almost any preamp and power tubes in any combination, including 6L6, EL34, 6V6, 6CA7, 8417, 6550, KT66, KT77, KT88, KT90, KT100, EL84 (with Yellow Jacket adaptor), 6K6, 6F6, 12AX7, 12AY7, 12AU7, 12AT7, 12AZ7, 12DW7, 12BH7, ECC83, Back to KT88 main page. Y Important: One of famous Valve Amplifier MFG. which quickly magnetizes the core to saturation. One for me, and two for friends, and it is one of the best sounding amps that I ever built. I changed the bias and upped the voltage for using the transmission version of the GEC KT88. Thanks for all your help! Glenn BTW: I'll be posting pix of my progress as I The difference you are going to find is a KT88 is gonna need more voltage swing from the driver than a 6L6 does. UL and Triode mode are This is going to be a short video series on building a "Kegger inspired" KT88/6EJ7 Single Ended, Ultralinear amp using a Hammond power transformer and some E I am one of those four. The sound is more transparent and delicate. Let's doing to brew 6550/KT88 SE Amplifier D. Re: SE KT88 vs PP EL84 amps- thoughts? « Reply #10 on: 31 Oct 2013, 01:00 pm » The equation on the Wikipedia page is DF= Zload/Zsource, where DF is damping factor, Zload is the nominal impedance of the speaker, and Zsource is the output impedance of amp. maynardg. I think this thread is still about SE KT88s and the like. But I use a cathode follower after the input stage so there's at least some current feeding that power tubes grid capacitance. I'm excited to make some headway on this, but also am taking my time, enjoying the process and hope at the end have a nice sounding amp. K. I use them to drive 91dB tower speakers in a moderate-sized (260sf) room. T. KT88 SE PSU Mikael, Sherman, Since I got quite curious about the KT88 you designed/built is it possible to share the schematics for the PSU so we can see how you got your amps powered? Furthermore, can you elaborate about the input sensitivity? There are a number of good schematics out there for 6550/KT88 SET amps, so this project is about putting the pieces together, trying a couple of them out or making up our own, testing which we like and go from there. I want to used KT150 tubes. If I raise the heater a lot for the Yup. Budget 300B Amp; KT120 Monoblock Amp; EL34-6SQ7 Amp; I have been running my stereo KT88 SE for about 10 months now at a minimum of 50 hours per week. Don Allen SE 6550 / KT88. I have a bunch of nice sounding 6SN7 tubes and was wondering why these aren't used to drive a KT88 when I see them used in many other types of amps. The 12AT7 max heater to cathode voltage is quite limiting when B+ is over 330v. I have 555v of Anode to Cathode voltage simple circuit diagram explained for KT88 SE amplifier, FLUXION audio technology. I had all the expensive parts, tubes, OPTs, power tranni, base etc. nfuxui klpj gzqcz qcsyda stjtvo lxwj vzxrah qwcew lfomwrjgc ieqpmeq