Deluxe Reverb Re-Issue High Frequency Noise.

jordankersten · 21st December 2008, 11:38 PM

I have a Fender Deluxe Reverb ('65 Re-Issue) that has a very quiet and very high-frequency noise coming out of the speaker. It is an extremely high frequency, I would say higher then 10K Hz, and it is very soft. It is intermittent and tone and volume controls on both channels have no effect on it. Reverb controls do not effect it and it does it when nothing is plugged into the amp. It does go away if you turn on the vibrato. Anyone run into this problem?

Merlinb · 22nd December 2008, 09:20 AM

Sounds like power amp instability. I would try putting a 100pF (or even up to 220pF) cap across each of the power valves' grid leak resistors, to stabilise the feedback loop.

21st December 2008, 11:38 PM	#1
jordankersten diyAudio Member Join Date: Oct 2008	Deluxe Reverb Re-Issue High Frequency Noise. I have a Fender Deluxe Reverb ('65 Re-Issue) that has a very quiet and very high-frequency noise coming out of the speaker. It is an extremely high frequency, I would say higher then 10K Hz, and it is very soft. It is intermittent and tone and volume controls on both channels have no effect on it. Reverb controls do not effect it and it does it when nothing is plugged into the amp. It does go away if you turn on the vibrato. Anyone run into this problem?

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22nd December 2008, 09:20 AM	#2
Merlinb diyAudio Member Join Date: May 2006 Location: York	Sounds like power amp instability. I would try putting a 100pF (or even up to 220pF) cap across each of the power valves' grid leak resistors, to stabilise the feedback loop.