Samson Servo 120 Amp Issues

[vletr]

Hello,

I have an old Samson Servo 120 (not the Servo 120a) amplifier that has a weird audio issue and I'm not sure where to begin troubleshooting. When playing music through the amp, the music will cut out or drop slightly, almost like dirty volume pots. I've done the basic "turn the pots up and down several times" cleaning that we do when this happens on the road, but I have the opportunity to actually try to fix the issue now. It's not a full-on drop out like when the amp is overdriven and a channel cuts out - I've had that happen with different amps and this is different.

I'm thinking it could be old caps, but I don't quite know the best logical place to begin testing. Anyone happen to have a schematic for this model?

Thanks for any help!

[spiros.p]

Re: Samson Servo 120 Amp Issues

first check for bad solders under board then check capacitors it is good to replace all capacitors they use realy crap quality.is the amp older than 15 years?check the relay cirquit.

[vletr]

Re: Samson Servo 120 Amp Issues

Thank you for the tips. I believe the large 3300uf caps have gone bad. All have some form of brown gunk underneath, which I suppose could've been glue that is no longer acting as glue. I'm going to start with those caps and then systematically work my way through the others.

Do resistors go bad as much or regularly as capacitors? There are some fairly large, maybe 2W, resistors on the board. They don't appear to be damaged.

[petehall347]

Re: Samson Servo 120 Amp Issues

if its bad caps it usually the smaller ones as they dry out quicker .