Brivan
Well-Known Member
I could use some help on this one. I've seen other posts on here about low volume coming from the left channel of a Realistic STA-860, but no given solutions for the problem. Using an audio tracer and a voltmeter, I've narrowed the problem down to one specific spot, but every component I've checked / replaced has turned out to be fine. Voltages check okay. I'm comparing my readings to the schematic as well as to the right channel, which works okay. From the schematic drawing, I get weak sound from both sides of C507 in the left channel, but weak sound from one side of C508 and loud sound from the other side of C508 in the right channel. These caps are 5pf and, although I haven't replaced them, ohm out okay. There's other transistors, diodes and resistors involved in this circuit, but all have tested okay and I've replaced TR505 and TR507 in the left channel without any difference. I'm stumped on this one. I can post a close-up of the amplifier circuit so you can see what I'm working on, if desired. Any help would be appreciated!