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sx-990

  1. S

    Pioneer SX-990 Left-Channel Static & Muddy

    Hi all, I recently acquired a Pioneer SX990 along with a set of 8ohm monitors & I'm looking for some advice on where to start with diagnostics. The right & left channels are working on both outputs A & B. The left channel on both outputs (A & B) has a bit of static in the 40% - 70% volume...
  2. Carbsandcaps

    Sx-990 burning emitter resistors

    Working on a pioneer sx-990 that keeps blowing the amp fuse on one side. While checking everything out I replaced the fuse again and the 2 watt emitter resistors started heating up. Then I realized I put a 5 amp fuse instead of the 2 amp it calls for. So I turned it off right away but I would...
  3. David Weaver

    Pioneer SX-990_Transistor Mystery

    I recently acquired a Pioneer SX-990 that after a little cleanup/deoxit sounds pretty darn good! Cosmetically it is in great shape and sounds very good but there is some noise with no signal and the volume turned up. I had recapped the power supply and pre-amp and although the tone came alive...
  4. goldswimmerb

    Sx-990 rebuild + Questions

    Hey guys, so I am currently working on restoring a "barn find" SX-990 and had a few questions. I've gone and rebuilt the amplifier stage as it originally had a blown output, but noticed a few things and wanted to see if anyone with experience could weigh in. I replaced the driver Transistors...
  5. Stink Bear

    SX-990 Dial Pointer Lamp

    I'm looking for information on dial pointer bulbs for an SX-990. I replaced bulbs in 3 different units, put in 40 ma bulbs, and they are pretty dim. I have two of the lamps that I removed, I measured the diameter of them with dial calipers, I come up with .2 inches, which converts to 5mm...
  6. 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
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