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amp restoration

  1. Mikefc

    Marantz SM500dc repair, help?

    I'm stuck and a little help will be greatly appreciated. There is a negative 12vdc bias on the right channel. the diagram above is where the issue lies. With Q715 out of the circuit all voltages and transistor biases are correct. With it in the circuit the 12vdc results on the collector and...
    • Mikefc
    • Thread
    • amp restoration dc bais error marantz sm500
    • Replies: 6
    • Forum: Solid State
  2. 1

    Pioneer Amp Restoration

    Hello All, First time post here. I recently threw the dice and picked up a Pioneer SA8500II at the Sally Ann for $10. Turns out it isn't currently working. I have looked up the reviews on this amp, and figure it might be worth having it restored. I have no idea how much a restoration typically...
    • 10habitant
    • Thread
    • amp repair amp restoration amplifiers pioneer amps pioneer sa-8500ii vintage amps
    • Replies: 2
    • Forum: Pioneer Audio
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