Is volume fluxuation typically a preamp tube?

[itsme]

Or not?

 

[psychodave]

Preamp tubes are easier to check, so start there.

 

[raiken]

Dirty contacts on an effects loop jack can cause volume fluctuations. This can be tested by plugging a cable between send and return.

 

[ZEN Amps]

Not. But maybe.

 

[hopkinWFG]

Check sockets pin hole..? If old amp maybe filter caps drying out?

 

[itsme]

Thanks fellas...