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amplifier

  1. J

    Nakamichi TA-4A in protection mode and problem with voltage in the 18v rail

    My Nakamachi TA-4A: the problem was that the left channel had less sound that the righ one, so i check it and what i found is that the difference in audio was originating in two parts: one: in the out of the volume pcb, with the osciloscope i check it and there was a little difference in the...
    • jerryf1
    • Thread
    • amplifier nakamichi protection mode ta-4 ta-4a
    • Replies: 1
    • Forum: Solid State
  2. Oscarshock

    How does the amp produced around 2000 compare the amp produced nowadays?

    Basically, I realized that this is a difficult question to answer. But I am actually wonder how people will response in different scenarios. Personally, this question comes to my mind because I am looking to replace my current integrated amp (Denon Pma-600ne ) with a older power amp (Myryad ma...
    • Oscarshock
    • Thread
    • amplifier power amplifiers solid state amplifiers
    • Replies: 33
    • Forum: Solid State
  3. michaelm101

    Continuous Vintage Failure: Please Recommend New "Modern" Amp

    I still have my old Kenwood KA-5700 I was awarded for straight "A"s in the fifth grade and I have fond recollections of going to the Federated Group and Cal Stereo dreaming about other gear. I've since collected several other amps/receivers of the 1970s era of Japanese crafted stereo gear. BUT...
  4. T

    Akai am-67 opinions? (And others in the range)

    I just brought home an akai am-67 integrated amplifier that I bought at a local record shop I often buy equipment from to restore and resell. I was very curious about this akai amplifier as I had never heard any of the amps in this series of akai gear before. I cleaned the pots and just did some...
  5. T

    yamaha rx-500 receiver no sound?

    I have a yamaha rx-500 receiver that does not work. Initially the relay didn't click in, I noticed there was quite a bit of corrosion around the filter caps and transistors so I took all those off, cleaned the area, restored some of the connections and tested for shorts on the transistors. All...
  6. E

    Pioneer SA-606 noisy output

    Hello to everyone, I have a problem with my SA-606 (SA-6700 version for Europe): There is an hiss similar to white noise through the headphone output. In the past I did some maintenance: 1) Recapping - used Nichicon "audio grade" KA series (light blue sleeve) for everything but main filters...
    • EqualSign
    • Thread
    • amplifier bias hiss noise recap sa-606 sa-6700 transistors
    • Replies: 0
    • Forum: Pioneer Audio
  7. E

    Pioneer SA-606 noisy headphone output

    (moved to Pioneer audio - my bad)
    • EqualSign
    • Thread
    • amplifier bias hiss lamps noise pioneer recap sa-606 sa-6700 transistors
    • Replies: 0
    • Forum: Solid State
  8. mbphotox

    LF pretty amp with VU meters and plenty of power and good value

    I only have my Pioneer AV-R to drive the B&W N803 at the moment. There's also my EL34 tube amp, but I'd rather not damage that baby, I guess (through using it constantly, I mean). Also, there's a little minime on the way, so the tube amp will likely have to disappear into storage for a couple...
    • mbphotox
    • Thread
    • amplifier hybrid integrated technics vincent vu-meter yamaha
    • Replies: 25
    • Forum: New Gear - Values
  9. J

    NEED! Portland or Seattle McIntosh Techs?

    Does anyone have any recommendations for professional competent audio techs with experience working with McIntosh gear? Seems harder than I’d expect so please let me know if you know a good tech or two.
  10. A

    Akai AM-35 amplifier suddenly stops sounding or sounding extremely bad/low on one channel

    Hello everyone! First time posting here. I've read many threads and after not being able to get help elsewhere, I've created an account and am now posting here. To keep it short and simple, I bought an amplifier, brand Akai, model AM-35 (apparently it was sold in the UK and Germany). It sounds...
  11. Racingh11

    Soundcraftsmen PM860 / PCR800 power-amp restoration

    I bought this amp in rough shape as a project to match my other PM860 beater amp. I should have taken before pictures. The inside was coated in heavy dust that was also oily. And all of the black sheet metal parts had the paint pealing off. I opted to fully disassemble the amp. Ultrasonic...
    • Racingh11
    • Thread
    • amp amplifier bridging amps pcr800 pm840 pm860 soundcraftsmen
    • Replies: 70
    • Forum: Solid State
  12. Bob123456

    Pioneer SA-8800 - high voltage readings

    Hello, newbie here hoping for some advice. I was recently given an SA-8800 in not-great-condition to refurb and sell on behalf of an elderly relative. I've got a little experience with electrical repairs and I guess I've had some luck in the past, but I have limited equipment (and space) to work...
  13. JamesWest...

    Nikko TRM-1200 Amplifier (1970) Repair Questions

    Hello all, I have what seems to be a bit of a rarity; A Nikko TRM-1200 preamp-amplifier (approximately 1970). Which I am having a couple of issues with. First, the VU meters seem really insensitive. They move a little if I turn on the loudness switch. Any thoughts? As a note: I did replace...
  14. A

    Regular, Sharp Pops Through Stereo

    Friends, Just posted about my system for a different problem (crackling on input changes and volume pot), but here's a new one that I started tracking. Managed to read some threads about this issue, so let me go through facts: Quick, assertive pop through the left and right speaker...
  15. Connor G

    Sansui AU-717 Restoration and Upgrade

    Hello fellow AKers! I just finished a comprehensive restoration of a beautiful Sansui AU-717. This thread is dedicated to showcase the steps I took during the restoration process. There will also be a video posted to my YouTube Channel showcasing the work I did there. Once it is uploaded, I will...
  16. Schmurpy

    Hitachi HMA 7500/8500MKII power meters needed.

    Hello, Hitachi HMA 7500/8500MKII power meters needed.
    • Schmurpy
    • Thread
    • amplifier power amp preamplifier receiver vu meter
    • Replies: 10
    • Forum: DIY
  17. G

    Looking for B&K ST-2140 Power Amplifier Service Manual

    Hello - I am looking for service manual of B&K ST-2140 Mosfet Power Amplifier. In 2020 I contacted ATI who owned B&K then and I got this reply: "Thank you for contacting us. Did a search of our legacy B&K database and could not find a service manual or any schematics for the ST2140. Sorry...
    • gramafone
    • Thread
    • 2140 amplifier b&k mosfet service manual st-2140
    • Replies: 2
    • Forum: Solid State
  18. C

    AU717 power stays on

    My amp stays on even when power turned off.Must be in the protection circuit, maybe.Red power light on always. Any idea?
  19. J

    Custom Terminal Build

    I'm finally addressing an issue that started, round about ten years ago, broken speaker terminals on my Fisher CA-2120 Integrated amplifier. I've been using this as a pre-amp for the Hafler P500 amplifier since the speaker terminals were junk. After the first two, the A and B R+'s broke, I wired...
    • JB1962
    • Thread
    • amplifier banana jack fisher integrated speaker terminal
    • Replies: 17
    • Forum: Speakers
  20. cuboid

    MC2105 Speaker thump

    Hi all I've got a well-loved but frequently-serviced MC2105. The current concern is that when it's powered on, I get some major speaker thump. Though it's just a single oscillation and my speakers are now pretty high power, they're now too expensive for me to risk damaging them from something...
    • cuboid
    • Thread
    • amplifier mcintosh solid state
    • Replies: 3
    • Forum: Solid State
  21. S

    looking for a power transformer for Philips Laboratories AH 578

    Hello dear DIY in HIFI, Everything is in the title, I'm looking for a power transformer for Philips Laboratories AH 578 to bring back to life my power amp. Sadly, I don't know anything about it and its specs. There is no information written on mine (the picture below is what I found on the...
    • senorderu
    • Thread
    • ah 578 amplifier laboratories philips transformer
    • Replies: 21
    • Forum: DIY
  22. C

    Sansui au717 or au7900

    I have a chance for either if these if I act quickly,need your expert advice. Neither have been redone.
  23. C Hart

    Testing amps

    Hi AKers. I hope you can help me with a question that has nagged me for a while. Among other gear, I have a .08% THD 5x120wpc-rated receiver. It just doesn't seem that clean when it's turned up and I would like to verify whether it is performing to its ratings. I'm sure there are high end test...
    • C Hart
    • Thread
    • amplifier test test bench test eqipment
    • Replies: 39
    • Forum: Solid State
  24. W

    Harman Kardon HK640 broken left channel

    Hello, Quite a while ago I asked my dad for his old HK640 that we used to have at home. I remembered it having some problems and was interested in fixing it up and using it. I have made some progress, but am currently somewhat stuck. I've been working on it off and on for quite a while, so I...
  25. ocdecio

    2238B noise on power amp (both channels)

    Here's something that is puzzling me. It is a spiky wave 20mV / about 520Hz with the amp running in idle and shorting plugs at Main In. The noise was there before replacing capacitors and diodes at the power amp and power supply. I doubt it is anything at the amp itself since both channels...
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