When I switch to the drive channel on my amp the volume fades in, there is also a slight pop noise when switching back to the clean channel at low and high volumes. when switching from clean to more drive there is no fade of volume but still a slight pop nosie when switching back to clean.
SOURCE: Fender Rumble 100 210 pop noise then hum after strong low e note
Replace C21 (10uF/50V) and C38 (2.2uF/50V) and it will work great.
SOURCE: Deville 212 overdrive channel making Loud humming noise
It sounds like a filter capacitor(s) has failed. The electrolytic caps dry out and cease to perform allowing unfiltered power to reach the preamp sections and get amplified.
Being this is tube with high voltages, an experienced person should work on it due to shock danger.
I assume you checked the tubes for shorts as well as emission since a heater to cathode short could cause this as well.
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SOURCE: Fender Hot Rod Deluxe. Turns on, sounds very good
More than likely a bad solder joint. Where is the next question. How confident are you with voltage measurments? The rails in tube amps are high and can kill you so if you are not inclined to do so please don't. The reason I suspect a solder joint is that it is a failure over time, cold solder joints expand and contract with heat. When they heat up they break connection. Not saying 100% that is your problem but it is very likley.
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SOURCE: Fender Hot Rod Deluxe Footswitch
Main thing to verify is that the particular footswitch and cable you have is specifically for that amp. If it is not the right one, that is your problem as there is very little compatibility among footswitches.
Looking at the schematic, plugging in JUST the cable shifts operation as you observed. This uses a crazy circuit in which AC is applied on the cable and the footswitch has a diode each direction that causes the amp to shift between the states. when you plug a bare cable in, it disconnects the internal diodes and switches for control at the amp, hence the signals float.
You should investigate the footswitch to make sure it is the right type with the diodes resistors and caps that is for the Fender Deluxe.
You can find the schematic for the amp here:
http://www.fender.com/support/amp_schematics/pdfs/Hot_Rod_Deluxe_Schematic.pdf
Look at the circuitry of the switches on the schematic at C8. Your pedal should have similar circuitry. Assuming your cable is good, the problem would be in the pedal itself.
SOURCE: fender m80 ...hey before im sorry bout my poor english.
output caps, replace them.
also the speaker could be getting tired.
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