Author Topic: Master Satellite amp distorting  (Read 188 times)

Offline craig

  • Fiesta Red
  • **
  • Posts: 28
    • View Profile
Master Satellite amp distorting
« on: March 19, 2019, 10:06:54 PM »
Hi all. I have a master satellite speaker that I'm trying to get up and running. Actually, it is up, and it is running, but it distorts. I've got 33v going to the preamp and I've done some work to it.

Replaced both output transistors with Motorola MJ15003
replaced all (3) filter caps with 5000uf 100v caps (one cap is on preamp board/external amp assembly)
replaced R16 - 44r (2x22r resistors in series) 2 watt resistors with one 50r 3 watt resistor.
replaced R8 with 100r 5w resistor
replaced C4 - 80uf 75v cap with 100uf 100v cap
replaced C13 - 5uf 50v cap with same

The amp is loud...really loud and distorted. Any thoughts?

Offline craig

  • Fiesta Red
  • **
  • Posts: 28
    • View Profile
Re: Master Satellite amp distorting
« Reply #1 on: March 23, 2019, 10:00:50 AM »
Is there a bias resistor on this for the output transistors? Anyone?? Thanks!

Offline pnoboy

  • Mark I
  • ****
  • Posts: 393
    • View Profile
Re: Master Satellite amp distorting
« Reply #2 on: March 23, 2019, 04:00:33 PM »
This sounds like a problem that cries out for an oscilloscope and DMM to solve.