Fender Deluxe Hot Rod Reverb Squealing

[tigertenfifty]

I have a Fender Hot Rod Deluxe thats squeals when the drive channel is engaged, has anyone come across this problem before, and could put me in the right direction please.

[Jazz P Bass]

Break out your volt meter, set it to read volts ac, place the leads on C36, the preamp decoupling capacitor, & measure the Vac ripple.

The capacitor is located directly to the rear of the input jacks.

If the cap is bad, when you strike a note, the signal will continue to 'ride' on the capacitor, instead of being 'decoupled'.

[tigertenfifty]

Thanks Jazz P Bass, that sorted the problem.