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output transistor

  1. curtisw99

    Output Transistor Different than Service Manual - Onkyo TX-4500 mkii

    I'm trying to get this Onkyo Tx-4500 (just acquired, non-working) out of protection, so first place I went was to test the outputs. They measure good, but they do not match the transistors in the manual. are these the wrong transistors, or are they equivalent to the ones in the manual...
  2. buerwi01

    Sansui 7070 Blown Fuses

    Hi everyone, I’m a long time lurker, first time poster, so thank you in advance for any assistance you can offer! I have an issue where the left channel on my Sansui 7070 stopped working, and was momentarily fixed by cycling the switches. However, it then stopped working again, and when I...
  3. P

    Marantz 2245 restoration... hit a snag and need some help, please!

    Hello AK'ers! I'm new here. I don't have a lot of knowledge but I've restored a couple of HK330's, one wasn't working, and recapped a Tandberg TR1040 without issue. I picked up a 2245 that the previous owner said "...had a quieter channel, so an output transistor was replaced and now it...
    • pkcain
    • Thread
    • high dc offset hum marantz 22xx output transistor relay click
    • Replies: 9
    • Forum: Marantz Audio
  4. jefferylhenr

    Sansui G4700 output transistor replacement

    The original output transistors 2SA1102 / 2SC2577 for the G4700 are essentially unavailable. Would the 2SA1693 / 2SC4466 or the 2SA1492 / 2SC3856 be good replacements? The 2SA1492 / 2SC3856 might be overkill, but could they be more resilient? Or would they not work at all? Transister Combo...
  5. E

    Looking for replacement 24v voltage regulator for MX113

    I have emailed McIntosh but they have not gotten back to me and I cannot find any information anywhere on the internet. the part number is M 065 7726 and the Q201 on the schematic. Anyone have any experience replacing this part?
  6. B

    Marantz 2275 - Right P700 issue

    I picked up a 2275 from an antiques guy last spring for a good price. It'd never been restored but still powered up and sounded okay. I upgraded the lights and cleaned all the pots first thing and had a beautiful summer and fall blasting records. The right channel would drop out at really low...
  7. Beavs

    Yamaha CR-2040 Shorted During DC/Bias/Voltage Adjustment

    Well, I'm pretty new to this and probably have no business digging into the likes of a CR-2040, but this is what I've found to pass the time and I'm enjoying every second of it. I picked this CR-2040 up for $200 knowing it was cosmetically great aside from being dirty and there was no sound out...
    • Beavs
    • Thread
    • capacitor electrolytic output transistor recap restoration transistor troubleshooting yamaha cr-2040 zener diode
    • Replies: 143
    • Forum: Yamaha
  8. hertzdonut

    CR-2020 Left channel is gone, fuses popped, some troubleshooting, where to next?

    My 2020 has been working fine, no issues as a bedroom receiver. (Light use). Background info: All service bulletins were completed, as well as other repair work to bring this unit back to life, about a year ago. (With help from multiple contributors on AK!) During recent use, I heard a couple...
    • hertzdonut
    • Thread
    • cr-2020 left channel blown left channel gone left channel not working output transistor outputs
    • Replies: 9
    • Forum: Yamaha
  9. Stink Bear

    Pioneer SX-990 main amp problems

    Looking for advice / help. The original problem was a weak and garbled right channel. I removed the pre-amp jumpers and cross jumped, the problem stayed on the right side. I then swapped output transistors and completely lost the left channel. I cross jumped again and still got output from the...
    • Stink Bear
    • Thread
    • garbled output transistor pioneer sx-990 weak channel
    • Replies: 25
    • Forum: Solid State
  10. prnewman

    Sony STR-DB930 repair

    Hi, I have a Sony STR-DB930 and could use some help! I was playing it last night (at high volumes, as usual!) and suddenly, the protector light started flashing, and the sound shut off. I tried to restart it a couple of times, but just saw green flashes from inside - I think it was the two...
    • prnewman
    • Thread
    • emitter resistor output transistor receiver repair sony str-db930 str-db940 troubleshooting
    • Replies: 0
    • Forum: General Audio Discussion
  11. A

    Phase Linear 400 output substitute

    Hi I recently bought a PL400 needing attention. One channel has original drivers and outputs (RCA 410 and XPL909). The other channel has some different components - Drivers are SJ2741 and the outputs are a mix of four PL909 and two MJ15024 - not good. Arrived with no main fuse. On DBT (with...
    • audiogymp
    • Thread
    • output transistor phase linear 400 pl400 substitute
    • Replies: 17
    • Forum: Solid State
  12. W

    What else to do when output transistors go bad?

    I have replaced output transistors in many different receivers and usually they function just fine afterward. Some continue to repeatedly blow the transistors. Besides merely replacing the transistors, what other steps and measures should be taken to ensure an amplifier is running properly and...
    • W.T. Holt
    • Thread
    • amp bias bjt output output transistor transistor
    • Replies: 13
    • Forum: Solid State
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