Channel death - Chinese EL34 PP

[theskintman]

I have a Chinese EL34 PP amp that had recently developed a problem with the right channel. Even with the volume at the lowest setting, it still put sound out of the right channel. The difference between left & right seemed to reduce as you raised the volume, but I'm not certain. Now, the channel has died completely.

I have no real idea what I need to do to fix it, but I've had a look inside and can't find any weak solder joints so I guess a component has died and needs replacing.

I am hoping someone here could give me some pointers on how to go about testing what has failed. I come armed with multimeter but little else...

A photo of the innards is below:

DSCF2989.jpg - ImageHost.org

 

[planet10]

The 1st thing i'd look at would be the pot.

dave

 

[azazello]

Hi,....Can You measure U on every blue cathode capacitors on EL34 and every small
red vertical capacitors on prestages tubes?