rebuild

  1. Tonedeftup

    Harman Kardon A30k. Ihave no idea where to start! Actually I do have an idea, this post is it!

    Hey there Community, I have been stalking the forums here for some time. Just made my acct and this is my first post. I just acquired this hk tube amp. It was sitting in a garage cupboard for an indefinite amount of time , likely years, maybe decades. Now what do I do? I know very little...
  2. bitomaxsp

    Akai GXC-760D rebuild

    In summer 2020 i bought a subject. It was broken. Failed to even start playing. I had never dealt with tape decks before that moment. I spent some time debugging it and found out that grease stuck in the counter gear, and belt was running around the gear. since gear was not moving, no pulses...
  3. PE9ZZ

    Complete Rebuild Electrocompaniet AW250R

    I am still unsure why I agreed to tackle this ancient monster amp. It is 40 years old and was eating output transistors like there is no tomorrow. Left channel only. But with 12 MT-200 transistors per channel it is quite annoying. And expensive. By now the board is ruined by the many repairs...
  4. spctrlhrmny

    replacement parts and substitutions

    Just looking for some general "rules of thumb" ... quite a newbie here. How important is finding replacement components (such as capacitors) that are audio quality? Do you have recommended vendors for finding these? Do you have any preferred places to shop for components in general? (RIP...
  5. W

    Rebuilding EV S12 cabinets

    Thinking of overhauling my old EV S12 cabinets to hot rod them for EDM shows I'm throwing. I found this forum and a similar thread on some even older EV cabinets so I figured I should make a post and get some advice before I pull the trigger. I have a local sound shop I'm going to consult for...
  6. J

    Another Sansui 4000 recap story...

    Well guys. Thought I'd share here my experience repairing and recapping a Sansui 4000 that was in dire need of attention. I bought this receiver several years ago (~$100) with the intention of rebuilding it. Actually, I bought two. One being specifically for parts. It came to me in fair...
  7. Z

    Pioneer SX-980 DC Offset fluctuation

    Hello! Been a long time lurker on here but finally encountered a problem I cannot seem to fix! Lets start at the basics: When I first bought this amp one channel was out. Fixed the channel but noticed that the DC Offset would not stabilize but the Idle current for both channels is a steady...
  8. Basspig

    Suggest Who Can Rewind Power Transformer Counterpoint SA100?

    I have an SA100 with a shorted HV winding. Have been trying to find a place that will either rewind it or make a new one to spec. Contacted six vendors, one said they might be able to make me a new one for under $500. I gave them the dimensions and the winding voltages and application. They...
  9. WillKennet

    RTR HPR-12 Speakers

    I want to do complete re-cone of the 12" woofers in my old RTR speakers. Can anyone tell me who actually made the speaker itself? It has a square magnet on back, but no identifying numbers. They have three speaker coils leads allowing them to be hooked up as 8 ohm or 4 ohm. And/or is there...
  10. DodgeShadow

    Kenwood TK-140x Rebuild

    Good evening everyone! I bring to you tonight, my guinea pig for my first rebuild. I have some experience soldering and repairing electronics that this job feels to be within my capabilities, and im looking for a little guidance. I have most all of the smaller caps selected on Mouser for...
  11. S

    Yamaha CR-2020 TR707 / TR708 mounting

    Are the TR707 and TR708 emitter pin correctly depicted on the Yamaha CR-2020 relay board diagram? That is to say, does the black pin on TR707 and TR708 correctly identify the placement of the transistor emitter? Leaning on Oilmaster's wonderful diagram description on his post, the rightmost...
  12. Will_Emanuel

    Yet Another SX-1050 Restoration

    Hello all, I have just wrapped up a major restoration on a newly acquired SX-1050 that had a very rough past to me and had arrived in very rough shape. The unit had been sitting in the attic of a small stereo shop near my university for nearly 27 years, according to the repair tag's date of...
  13. P

    TD-124 e50 motor rebuild; pins damaged

    As it seems to happen so often, the complex parts of the job are easy and the simple parts are challenging. Pictured are the 1.9 or 2mm (another thread claims they're 1.9mm but mine measure out at 2mm even) brass pins that hold the coil holders in place. The bottom one made it out in good...
  14. Super Noob

    Project: Fisher CA-880

    Had an opportunity to pickup a CA-880 unit for reasonable $s since one channel was not working. It utilizes a STK-0080s and is a great candidate for the RCS16 collaboration project pack upgrade. The large studio fisher (sanyo) gear from the early 80s has some impressive transformers and...
  15. bitomaxsp

    Marantz 2275 rebuild

    I am rebuilding my 2275. It was in a bit of tired shape i'd say. But when i disassembled it it was more that tired. I guess everyone is aware what is on the picture. I am make 3D model now to 3D print this lamp holder. Once i'll validate that model is ok in reality i'll make it public so...
  16. jahmadeus

    Accessing SX-1010 Tuner Board

    Hello all, I am finishing up a rebuild of my SX-1010 and only have the tuner board left to work on. I have noticed that it is tethered down by its wire wrap connections on nearly every side. I have had success with desoldering select wirewrap posts from the other boards to gain access. However...
  17. Will_Emanuel

    Yamaha CA-1010 Major Restoration

    Hello all, I feel it's about time that I sit down and document my major restoration to my Yamaha CA-1010. This year I have done 6 major restorations on these units, 2 of them being on its big brother, the CA-2010, that has a lot in common. For those that need more info on the 2010 restoration...
  18. D

    Sansui AU717 dropping left channel after rebuild

    Hi All, I restored my all original Au717 last year following Leestereo's guide and parts list. Before doing this, the channel would drop and would only come back on if I quickly turned the volume knob higher. I thought cleaning all the switches and pots along with the rebuild would have fixed...
  19. V

    Scott LK72B rebuild

    Trying a different approach now. I’m about to begin a complete rebuild of an LK72B with transformers and new can caps but everything else gone as I’m tired of too many little issues popping up. A scratch here, a pop there, NO SOUND for two days followed by glorious stereo for two weeks. I have...
  20. Super Noob

    Project: Onkyo TX-8500 (mkI)

    In my quest to NOT buy anymore 70s receivers / amplifiers.... I have relapsed again. My focus is limited = great value, typical larger WPC, not working. Have read a lot about the TX-8500 mkII Onkyo and wished to find one. A TX-8500 mkI popped up locally in non-working state = it must be fate...
  21. sadsteve

    Need some help and advice with my new table (Thorens TD 126)

    So this is my first post on here, sorry if I make any mistakes cuz I'm still learning how to post, but its a lot better than lurking in the shadows reading through threads like I have been. That being said, I recently picked up a Thorens TD 126 Mk II for $80 on craigslist. It's seen better...
  22. Timothy Flath

    Pioneer SX-950 Restoration Project

    Thought I would share my project video series from a restoration I recently did of a tired old Vintage SX-950 receiver I recently finished restoring. It now has a new lease on life and will still serve for many more decades to come. Jump to the last part to see the final outcome. Here is part...
  23. Super Noob

    Project: Pioneer SX-1280

    Time for me to share another build. Keep in mind that this 1280 was picked up with some issues. Fired it up on the dim bulb = passed. Seemed to work somewhat... bias was off in one channel and offset was off. I dialed DC offset to a more acceptable level and tweaked bias as close as...
  24. jahmadeus

    SX-1010 Rebuild Questions

    Hello all, I recently acquired an SX-1010 in fairly good condition from a friend who is upgrading their system. My friend was the original owner of the unit and said it has never displayed any problems. Serial number indicates it was manufactured in November of 1974. Visually inspected the...
  25. A

    Bose 901 EQ light/power switch

    So I’m wrapping up my restoration of a Bose 901 Series I Equalizer, new caps and resistors throughout, and something strange happened. The neon light hasn’t worked since I got it, and I’ve yet to deal with a replacement. But yesterday when I (thought I) was finished and put it all back together...
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