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output drivers

  1. A Sound Mind

    HK 730 Output Transistors

    I'm restoring this receiver and pulled the output transistors for testing and to apply new sil-pads and compound. It uses 2SB541 and 2SC388.matched pairs. I tested them on an auto tester and they id'd correctly, but their hfe results were far below spec. Does this mean that they're tired and...
  2. UrbaXter

    Output transistors for Marantz 250M

    Hi guys, I burned out the right channel output transistors of my 250M... :( According with the SM the right ones are SJ2519 and SJ2520, BUT, my unit has at the left channel, two pairs of A747A and C1116A, so my questions are: 1- We have today options available for the originals? 2- I found...
  3. H

    Replacement output transistors for 2SA747 and 2SC116 - Yamaha A-1

    Need to replace a pair of OT’s on a Yamaha A-1. Have a couple of recommendations but can anyone say which transistor pair is best suited OR has worked well in this particular amp (or both, of course!) Would like to place an order today if possible, so all replies much appreciated. Existing...
    • Hifibythekg
    • Thread
    • 2sa747 2sc1116 a-1 output devices output drivers to 3 transistor replacement transistor substitute yamaha a-1
    • Replies: 3
    • Forum: Solid State
  4. Ray122

    Marantz 4270 Help...

    Alright, so I've got a Marantz 4270 with a bad channel, spitting out DC and throwing it into protection mode. Only one of the output transistors was shot, I believe it was the one that handles the negative swing. Otherwise, all the semiconductors on the board and otherwise are testing OK. I can...
    • Ray122
    • Thread
    • 4270 amplifer help marantz marantz 4270 output drivers repair repair channel diagnostics repair help
    • Replies: 6
    • Forum: DIY
  5. Mightyhal

    SX-880 Output Transistor Replacements (B705A, 2SA1075)

    I have a SX-880 with some issues at moment, partially self-inflicted when I let a probe slip while checking the voltages when powered on (building a dim bulb tester now that the horse has left the barn). So, I have a list of components which I'm buying, with the plan to test and replace with a...
  6. D

    Onkyo TX-8500, NADA - 405

    This venerable old receiver recently started going into protection mode. The obvious damage was to R41 ( 5W 0.47Ohm cement by Micron 77). After reading the post by Jon_Logan, goat67 and str8tlk http://audiokarma.org/forums/index.php?threads/onkyo-tx-8500-trouble.223285/page-5 I determined that...
    • DanWentworth
    • Thread
    • 2sb554 2sd424 collector emitter resistors mj21193\94 nada-405 onkyo output drivers repair tx-8500
    • Replies: 7
    • Forum: Solid State
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