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transistor substitution

  1. A

    Vintage Transistor Substitution Help

    Hi, Need help with a problem fixing vintage units. Attempting to source replacement BJT transistors for a couple Pioneer pieces. Running into stumbling blocks and am wondering, first, if there is a quality information source for substitutions? I've spent a couple of hours looking and am...
  2. troutmaskrep

    Harman Kardon 330A transistor substitution woes - help needed

    I’m working on restoring a Harman Kardon 330a amplifier that was blowing fuses due to multiple shorted transistors. Among other issues, one of the four CDC8002/9002 “flying saucer” transistors was blown. Following advice from an old thread on a different amplifier model, I replaced all four with...
    • troutmaskrep
    • Thread
    • 330a harman kardon repair transistor substitution
    • Replies: 19
    • Forum: Solid State
  3. MorrisonAgen

    2N4915 -> 2SC1402?

    Hey all, I found a couple bad output transistors in a Scott A436. The original transistors are 2N4915. I have a clutch of 2sc1402 transistors that I pulled out of a different unit. It SEEMS like those would be an acceptable replacement… is there any reason why they wouldn’t work? Thanks!
  4. Richard P

    Sansui QRX-3000 Driver Transistors

    I just finished repairing a QRX-3000 that had both front channels out - 2 outputs (2SD313), the output caps and the NPN drivers TR805 & TR806 (the schematic calls for 2SC634As but the original parts that were installed were 2SC1364s). Everything else tested good. I used 2SC1060s for the...
  5. A

    CR-420 Transistor Replacemnts

    Hi this is a call for help for all good hearted geniuses out there. I got a non-working CR 420 a couple of years ago and I have got it to work a couple of times but for very short time. I decided to replace the transistors and it is being hell. I was wondering if anyone out there has a list of...
    • adolfo
    • Thread
    • cr-420 transistor replacement transistor substitution
    • Replies: 5
    • Forum: Yamaha
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