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amplifier

  1. D

    Recommended NYC repair shop - is there a consensus?

    Reading through threads on this topic (and yelp reviews, etc), I can't seem to find a consensus - is there a reasonably priced, reliable place for vintage audio repair in NYC or environs? I have come into possession of a Tandberg 3012 which sounds amazing, except there's quiet to crunchy static...
  2. Squidward

    Kegger Schematics Mega Thread

    I'm going to start this thread with a specific aim: To preserve the knowledge that Kegger freely gave our community. This thread is for posting schematics that Kegger created. He designed some very popular amps (KT-88 SEUL, for one), but he also has some lesser known designs that shouldn't...
    • Squidward
    • Thread
    • amplifier diy el-84 kegger kt-88 push pull schematic seul single ended tube amp tubes
    • Replies: 51
    • Forum: Tube Audio
  3. jFF_Bulbo

    Marantz 2440 bad sound on right channel.

    Hello AKérs I have a 2440 unit in restore proces. When it arrived it has poor sound on the right channel. So i decide to test the 2sc1445 transistors, two of them were in short. So i change one with. 2sc1445 and the other with nte175. The sound wasn´t equal an both channels, so i decide to...
    • jFF_Bulbo
    • Thread
    • 2sc1445 amplifier fix help marantz nte175 reight channel repair
    • Replies: 9
    • Forum: Marantz Audio
  4. TheWolf82

    Harman Kardon Trio A224 - Questions for a tube newbie ;)

    Hi guys, Have been enjoying the site, the helpful members, and the massive amount of info available. I'm going to dip my toes in the tube world for the first time however my pockets arent very deep at the moment. My repair guy has a Harmon Kardon Trio tube amp that he is selling for 150.00. I...
    • TheWolf82
    • Thread
    • amplifier harmon kardon harmon kardon a224 harmon kardon trio klh model 6 tube amp vintage
    • Replies: 7
    • Forum: Tube Audio
  5. noiselectro

    Can someone identify this mistery... ¿amp?

    Hello. I' just got this component, and I'm not sure if it's a radio, a preamp, or and amplifier. No brand name or model. Can someone identify it please? Thanks in advance for your replies.
  6. Connor G

    Sumo Polaris Power Amplifier - What a Surprise!

    Transitioning from some of the best amplifiers to come out of the 70's, I ran across this little gem. I've had it stored for about a month in my closet after I scored it in a package deal. I hooked this tiny power amplifier up to my daily drivers - the Canton Ergo 70's - and my jaw immediately...
  7. Connor G

    Kenwood L-07M Vs L-07MII

    Hey all! I've been a happy user of a pair of L-07M monoblocks for the past couple of years. I've had them completely restored and I'm in love with the sound; Honestly better than any other amplifier I have heard, no matter the price. I recently bought a pair of Mk2's on eBay because of a tip...
  8. Joel Cairo

    Lost... and (quite unexpectedly) found: "The Heart of Motown"

    Or at least, an important part of "The Sound of Young America"... It's one of those things that if you were purposefully searching for it, you wouldn't find it in a million years. At least I wouldn't have. Though I have to add, what makes it even more serendipitous is that I (and probably most...
  9. I

    Please help!

    So I am extremely new to building tube amplifiers. I've never done this before, but this concept intrigued me alot, therefore I decided to build one. I followed a schematic of a 20W pc tube amplifer. To my knowledge, and to checking my work multiple times, I have followed the schematic...
    • ilya__
    • Thread
    • amplifier noise preamp noise tube tube amp distortion tube amplifier valve
    • Replies: 22
    • Forum: Tube Audio
  10. C

    Music Hall a15.2 Loud Buzz

    Hello everyone! I recently picked up this amplifier to give it a go to repair it. I used to play around with audio equipment and I figured this would be a good return! I am certainly not an expert but hopefully I'll learn a thing or two on the way. Anyways, the amplifier turns on but it starts...
    • cozger
    • Thread
    • a15.2 amplifier buzz music hall
    • Replies: 3
    • Forum: Solid State
  11. Mike Sweeney

    Bias transistor revisited

    I read with interest this thread - http://audiokarma.org/forums/index.php?threads/solution-for-2270-high-bias-early-serial-number.770102/page-2#post-10572328 And I liked it well enough to go back to my two boards and redo the two transistors I had just soldered in last night :) But I made a...
  12. X

    Repair Help: Grommes Precision Amplifier G125

    I found an old amp at a thrift store in McKenzie, TN that came with two microphone mixers and a feedback controller. When I pulled the amp off the rack, the two capacitors inside had burst. They were the exact same, so I only pictured one. There's a TI-84+ for reference, but I don't remember the...
  13. musichal

    NuForce STA200 Power Amp

    First, I want to make it clear that I have not heard, do not own, nor am I considering a purchase of this amp because I simply have no need for it. However, it looks like it could be a winner, and I failed to find any threads about it. So if you show me one (or five) such threads, then, well...
  14. robitaille03

    Proton D1200 strange behavior

    I have a Proton D1200 amp and every once in a while when I power it up and play something, the left channel is at a much lower volume and the sound is distorted ... if I turn the volume all the way down, the left VU meter will not bottom out, instead it'll read around 0.01 but no sound is heard...
  15. david winter

    Fisher X-101-C - what modern 7591A would be best ?

    Hi, I'm currently working on a Fisher X-101-C. The 7591A were all done. It's recaped and I haven't checked posts about improvements . I wanted to know what modern type of 7591A would work best considering the voltages. I also read somewhere that fixed bias models should have the 330K grid leak...
  16. Dannyx

    Help with Technics SU-V505 amplifier (not starting)

    Good day folks. I'm new here so hopefully I'm doing everything right and can get some help with this amp I'm trying to fix. I like to give plenty of details, so please bare with my long messages, since there's a lot to discuss. So: it's a Technics SU-V550 - fairly old stuff - but the price was...
  17. K

    Audiosource Amp210

    I have to take the hood off every amp.Thought yall would wanna see.All i could afford right now.Its discrete design with a toroid xformer.Someone may know,are the output transistofs Toshiba? Also if someone has the schematic and service manual can you email it to me? I took photos under the hood.
    • klipschoid
    • Thread
    • amplifier audiosource discrete toroidal transformer
    • Replies: 0
    • Forum: Solid State
  18. Metzu

    what amplifier its the one on this picture?

    vintage amplifier silver front
  19. MBuras

    Marantz 1060B Rebuild & Troubleshooting

    Almost since the beginning of my time on this forum I've heard derogatory comments about the 1060B amplifier. Build quality is terrible, sound is terrible, nothing like the original 1060, etc. So of course I had to find out for myself. :D This one came to me in great cosmetic shape and...
    • MBuras
    • Thread
    • 1060b amplifier buzz hum marantz troubleshooting
    • Replies: 12
    • Forum: Marantz Audio
  20. kjello

    dbx vs H/K amplifier

    These 2 blasts from the past showed up on my local cl What would you choose. Both looks 100%. H/K twice the dollar. dbx BX3 or Harman/Kardon Citation 16
    • kjello
    • Thread
    • amplifier citation 16 dbx h/k
    • Replies: 18
    • Forum: Solid State
  21. FireGuruMN

    Heathkit W5M too quiet

    Oh no another W5M restoration! I had a pair sitting on the bench with a whole pile of expensive tubes and replacements parts sitting next to them for about a year of so. I thought it would be wise to learn how tube amplification works before tearing into these amps. I was originally thinking...
  22. J

    Heathkit Signal Tracer to Gibsonette hybrid Guitar Amp Conversion

    In this video I take my cosmetically damaged but fully functional Model T4 signal tracer and convert it into a guitar amplifier using inspiration from a Gibson model GA-8T schematic to produce a hybrid amplifier. The project starts off with planning and possibilities and then jumps into the...
    • JRUBIN
    • Thread
    • amplifier gibsonette heathkit signal tracer
    • Replies: 4
    • Forum: Tube Audio
  23. lattiboy

    510m channel imbalance issue

    Hello all, I just picked up a beautiful looking 510m and 3600 at a garage sale. It's a single-owner unit and appears to be in near perfect condition. There is no distortion, the fan runs, and all lights and meters work perfectly However, the right channel is about 40% quieter than the Left...
  24. Rpower53

    Impressed with a Crown XLi 2500 class A/B amplifier

    Trying out a new Crown XLi 2500 amplifier for my JBL 250Tis and I am very impressed with it's sound quality. I expected it to control the speakers well and it does with the bass lines more prominent and controlled. But I was hoping that it would be very revealing as well and it is, which I did...
  25. P

    Acurus 200x,3

    Hi ,can I use acurus a200x3. As regular stereo using only two channels?thanks.paolo best regards to all.
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