Question about Fender Hot Rod Deluxe Guitar Combo Amplifier

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My amp is making a high pitch noise almost like feed back. I only use the clean channel.When I tryed the other channel it is not working at all. Bad tube?

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Bad tube? maybe
Try removing each tube 1 at a time starting at the first preamp (12ax7) If the noise stops after a particular tube is pulled replace that tube with a known good tube. Shut down the amp between tube pulls, Power tubes don't usually cause this problem but I'd pull them anyway,just remember they get very hot.
Make sure all tube shields are on and replaced after tube pull test
The most common cause of oscillation is a open or leaky filter cap,this would require a cap job and unless you have a good knowledge of tube electronics and the voltage dangers present,I wouldn't suggest doing it yourself.
Also if the output transformer was replaced or rewired or the negative feedback circuit was touched oscillation could occur also.
Make sure your guitar cables are in good shape, a cable with a bad shield can cause problems too.
Excessive noise can occur when one of the 1/4" input jacks shorting bars doesn't make contact to ground. A duumy plug would confirm this but you could also plug two guitars with good cables, into each input and see if the oscillation disappears.
Hope this helps

Posted on Nov 21, 2010

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If not a valve issue check 1000uf smoothing caps in +/- 16v supplies on main board also check solder joints zener diodes and associated dropper resistors

Posted on Apr 26, 2014

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