MC50 Distortion

[ivandezande]

Turns on and plays, but get distortion pretty quick.

I've replaced all electrolytic caps, all transistors except the drivers and outputs, and the emitter resistors.
Absolutely zero change!

What do I shotgun now?

 

[ivandezande]

Crickets huh.
I should mention all power supply voltages are intact.

 

[SaturationPt]

I think that the McIntosh forum doesn't respond well to "shotgun" repairs, most of your responses will not be positive.

My answer is that you will need to trace the distortion, use a sine-wave input and trace it through the input, preamp, and driver stages to see where it distorts then focus on the voltages and values in that stage/section.

 

[ivandezande]

I think that the McIntosh forum doesn't respond well to "shotgun" repairs, most of your responses will not be positive.

My answer is that you will need to trace the distortion, use a sine-wave input and trace it through the input, preamp, and driver stages to see where it distorts then focus on the voltages and values in that stage/section.

That's fair. I didn't mean it like it sounds I guess, I was more looking to know about commonalities with these.

 

[SaturationPt]

That I don't know. I had a 2505-1 which shares the amplifier design, but never had any problems with it.