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amplifier

  1. A

    Peavey CS 1000 Hiss

    Hey guys, and girls ofc :) Recently started learning how to repair faulty amplifiers. My very first project was a Peavey CS 1000 Power Amp that i purchased off ebay. Took me a while to get to grips with what im doing, But i eventually figured it out... But to cut a long story short.. The amp...
    • AyEss
    • Thread
    • amplifier channel cs 1000 hiss idle one peavey
    • Replies: 7
    • Forum: DIY
  2. woodhous

    Help picking out a stereo amp for Infinity RS IIBs

    Hi there! I recently came into ownership of a pair of beautiful Infinity RS IIBs. Believe it or not, I found them on the street being thrown out!!!! I managed to get them repaired professionally and they are truly a wonder. That said, I'm currently powering them with a really underpowered...
    • woodhous
    • Thread
    • amplifier infinity pre-amp recommendations rs iib stereo amplifier stereo receiver
    • Replies: 17
    • Forum: Solid State
  3. david winter

    Heathkit AA-40 - strange voltages at 6AN8A plates

    Hi, I have been working on a Heathkit AA-40 amp for which I did the following works: - Set to 230V mode (powered at 240Vac). - Surgistor replaced with CL-90 varistor - Tubes: two NOS Sylvania 6AN8A + four good EL34 - All electrolytics and coupling caps replaced - Most resistors replaced (out of...
  4. O

    Why does Luxman recommend installing different capacitors?

    For some reason, Luxman recommends installing different capacitors C506 and C507 (30000uF x 71V, 15000uF x 63V) in the power supply of Luxman L-503 amplifier. I installed two 22000uF x 80V capacitors. One of them started leaking after 5 hours of using. Possibly bad Chinese quality. Now I have to...
  5. Dav3

    Little mystery amp

    Picked up a box of interesting junk for $10 from a yard sale today including some nice ham tubes, an Admiral 6S12N console pull, and a funky little amp I was wondering if anyone could identify. It 'boasts' a single 6X5WGT rectifier tube, an old style speaker out socket, and a Kenyon T157...
    • Dav3
    • Thread
    • amplifier kenyon transformer mystery
    • Replies: 12
    • Forum: Tube Audio
  6. Hollow_Man

    The right channel of the National Panasonic SU-3400 amplifier gets hot.

    Hello everyone. I definitely have a problem with this amplifier, when I bought it it was very neglected, it was reassembled with parts from other appliances, it had 4 diodes tied together as a power supply, etc. So I started to repair and replace everything (or almost everything) that was not...
    • Hollow_Man
    • Thread
    • amplifier hot national panasonic right channel su3400
    • Replies: 5
    • Forum: Solid State
  7. R

    Kyocera A-710 puzzle

    Hi all - I have been banging my head against the proverbial wall with a Kyocera A-710 integrated amplifier. It originally came to me with a blown output transistor, which was addressed easily enough (though I was surprised that the emitter-collector short did not take out the .22 ohm emitter...
  8. S

    Do the Yamaha CR-1020 and 2020 have the same output amps?

    Hi all, I feel kind of silly asking this but where comparing pictures the amp output assemblies and parts look identical. I have not been able to compare parts lists for these two and thought I would ask since a lot of parts are interchangeable on these.
    • SharkBait07
    • Thread
    • amp amplifier cr-1020 cr-2020 output yamaha
    • Replies: 8
    • Forum: Yamaha
  9. JDSmith

    Pioneer SA 7500 restoration

    Recently began working on an SA 7500 in good condition. (Not MK II) Unit appears to be in original condition and the boards have required minimal cleaning. So far only changed out speaker inputs for modern binding posts. Planning to recap and restore the unit to its best self. The interior...
    • JDSmith
    • Thread
    • amplifier cleaning pioneer sa 7500 restore
    • Replies: 0
    • Forum: Pioneer Audio
  10. Nathan44

    [Help needed] One amplifier channel not working properly

    Hi there! I got an old turntable setup from my dad and I'm trying to get it working again. One of the problems is with the amplifier. Namely the sound from the left channel does either not work or is having trouble creating sound. I already scowered through some forums trying to find a solution...
    • Nathan44
    • Thread
    • amplifier distorted channel not working old amp potentiometer relais
    • Replies: 8
    • Forum: DIY
  11. D

    Rotel RA-1412 Right Output Low

    Hello All, I am working on a Rotel RA1412, when it came to me the right Watts meter was out, after replacing it I noticed the Left & Right meters were not matched. Consulting the service manual I input a 100 Hz Sine Wave on the Aux input, crank volume until I get 9V across an 8 ohm load, and...
  12. Wray & Ting

    Optonica SM-3636 protection mode

    This is a happier thread than I thought I was going to be starting when I woke up this morning. My Optonica SM-3636 that I've owned for about 3 years went into protection mode while idle last week. For several months leading up to that, it had been intermittently emitting very loud bursts of...
  13. Cricketgg7

    KA-92B Amp not outputting left channel

    Hey y'all, I've been all over the web and made an account here hoping for some assistance. I'm trying to set up my parent's old Kenwood system and running into a block with the KA-92B stereo amp. I'm not getting any audio or signal into the left channel at all, on either bus. I've 2 speakers...
  14. T

    Can I replace stk 0040 II with stk 0040?

    I am working on an akai am uo3 amplifier and I need to replace the stk 0040 ii power amplifier ics but I can only find stk 0040. Are these fine to interchange?
  15. S

    $365 for a great condition Technics SA-5370?

    Hey AK, Been looking to upgrade from pre-amp to amp for my technics sl-1500 and came across this listing on Facebook marketplace for $365… “Technics SA-5370 made in 1977 it’s in beautiful condition, new lights, controls thoroughly cleaned, chassis has been sealed and is in beautiful...
  16. J

    AZ-470

    Hello! I have an Pioneer AZ-470 amplifier, and i have issue with speaker A+B mode - it is not working. Speakers A and B works, when set separately, but when i toggle speakers A+B setting, it's not working. Any ideas why so? Do i need all 4 speakers to be 16 ohm's instead of 8? Thank you!
  17. G

    Does the amplifier impact the quality of bass in hybrid speaker systems?

    Hello, So I am thinking about (not planning to buy, just wondering} hybrid speaker systems e.g. Gryphon speakers or Paradigm Persona 9H, and there are few thing that bother me. Let's say we have weak 8W tube amp which on it's own doesn't have very impressive bass, and now we plug it into our...
  18. VonKuhn

    Kenwood KR-7600 transistor problems

    Hello, after weeks of searching I am finally desperate enough to post a question and look for help. Recently I got a Kenwood kr-7600 in great condition to repair, just a bit dusty, and no sound at all. After some searching, I found a transistor (2SC1419 NPN) surrounded by dark spots on the board...
  19. pluske

    Looking to upgrade from Sansui to Luxman

    Hi AK, I hope to get some advice on amp choices For the last few years I've been very happily listening to a Sansui AU-666 (fully restored by TomB). Recently, I picked up a Luxman turntable that I am also extremely pleased with, in part because I think the styling is so beautiful. Ive since...
    • pluske
    • Thread
    • amplifier luxman sansui solid state
    • Replies: 16
    • Forum: Solid State
  20. S

    Getting 5.1 from an old Amp

    I have an old amplifier Onkyo HT-S590 5.1. I used 5.1 with DVDs, but these are mostly unavailable nowadays. How can I get 5.1 sound, from Netflix, HBO, Spotify, etc.? The rest of the equipment I have is a non-smart TV LG 32LH30FR, with a Chromecast (probably 1st gen). I could purchase a...
  21. ocdecio

    General testing procedure for amps

    After many restorations I am still uncertain as to the proper sequence to ensure an amplifier is in good working condition and ready for performance testing. Last week I had a 2238 that on the surface was working but 5 minutes into testing it, smoke came from an emitter resistor and a driver...
  22. david winter

    Luxman M-2000 can't adjust bias

    Hi, I'm trying to find out why the bias on both channels can't be adjusted. The amp was recaped, I cleaned the relays which work fine (the first clicks within one second after powering up, followed by the second relay (which turns the VU lights on) 3 seconds after). The voltages going to both...
  23. dave404

    Marantz 2252b Amplifier voltages weirdness

    I've been trying to fix a friends 2252b that he got several years ago and I'm having a difficult time figuring out what I could have done to FUBAR it. Hoping the large brains here have an answer. As some backgroud I'm not new to this. I've fixed several Marantz and Pioneers in the past but I'm...
  24. Engel

    Starter amp for the Sansui curious...

    So I keep reading about how great Sansui amps are and have become curious enough to maybe try one out. What's a good model to look out for? Let's say budget under $1000 (Australian) for argument's sake. (That's about US$750) Bit of background, I currently run a Luxman L85V into an old pair of...
  25. E

    Please Help ID This Amp

    I‘m hoping that some smart person can identify this amplifier and ??? The big transformers are labeled Dynaco A-440. I don’t know if this is a Dynaco unit or a custom build. There is a second unit which has 6 more big transformers in it. I’m sorry that’s the only picture of it because I just...
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