amplifier

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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?
  6. 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...
  7. 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!
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. JB8

    SONY STR-7035 - Dead Right Channel

    After cleaning pots and pushbuttons thoroughly (and multiple times), I'm still not getting any sound from the right channel via headphones or speaker outs. Cleaning the volume/balance pot increased the output of the good channel significantly, but the right channel is still dead. Right channel...
  18. K

    Barn find Sansui AU-7900

    Hey guys, this is my first post and I'm not really all that great at rebuilding amps yet. I was wondering if anyone could help me with my problem. I have no real history of the amp other than it was in a barn with its top and bottom off, and had a mouse nest that had mouse chewed wires in...
  19. teddyfreddy

    Update on my Calbest amplifier project

    I ordered some components off of Tubedepot, two capacitors are on backorder as of right now but I have most of what II need. I also found 2 NOS 5AR4 Toshiba tubes on Ebay.
  20. Zether

    A couple of Technics SU-V8

    Hi all, I have been listening music so far using a Naim NAIT 5i with Dali Oberon 7 speakers, but found this combination to be lacking in the low end so went on a quest to find a "new" amplifier which would hopefully be able to drive the speakers better. Due to the environment I have been raised...
  21. F

    Sony TA-AX22 repair

    Hi, I'm quite the beginner in DIY repairs, so I'd like some help troubleshooting. I have an old Sony TA-AX22 amplifier. The speakers don't work (no voltage at all on the outlets, but the resistance of the speakers themselves seems fine). The STK 2129chip might be at fault from what my...
  22. polhem

    Upgrade from NAD 3020i

    I have used a NAD 3020i as my amp the latest 10 years. I have not found any amp that can match its details and treble. Though, since trying a NAD 319 dedicated power amp in my system I realise that the 3020i lacks definition and power in the lower frequencies. I wonder if anyone has a...
  23. M

    Splitting Signals from Sources

    Hi, I am hoping I can get some advice from people with much more HiFi experience than me. I have a Wyred 4 Sound STIv2 500 amp with which I am very satisfied.Unfortunately, the amp doesn't have an integrated headphone jack. I currently have line inputs from a CD player, TT preamp, and streamer...
  24. Jxmos

    Fisher 660-A Stand Alone IBAM or EFB, ETC.

    I'm working through the mods on a Fisher 660-A stand alone amplifier and have a couple questions for the experts. I've found a number of posts on this amp and lots of helpful information but I've not found examples of Dave Gillespie's Enhanced Fixed Bias (EFB) Regulator installed into a 660-A...
  25. KNielsen

    Aragon 4004 converted to MK.ll and maybe other mods

    Hey AK. I want to share this project as this might inspire others to either restore or make the fully rebuild. It should be mentioned that the Aragon 4004 in this thread is built by request, soo..... -some parts cannot be selected otherwise, as this is a request by the customer. The most...
Back
Top Bottom