Fender "the twin" hum

[Enzo]

Static is more likely to be a noisy resistor or tube.

[timgman]

Static is more likely to be a noisy resistor or tube.

OK, I touched up some solder joints on the effects loop tube socket and pi socket.
I changed out the pi tube and cleaned all the sockets.
we are 100%
I'd like to than all of you that helped me go through this.
so the main issues were (for the record)


My 1990 Fender "The twin" issues were as follows.
1. overheated / lifted traces on the 30 ohm / 10 me resistor (I've ordered a chassis mount one to resolve later)
2. loose tube socket connections
3. dirty / nasty tube sockets.

You guys taught me to safely drain caps, diagnose some basic circuits (the heater circuit) and spot loose / bad connections.
Thank you all for your help and cheers!

[Tom Phillips]

Static is more likely to be a noisy resistor or tube.

Also check for additional bad solder joints, dirty/loose tube or switch contacts.
In "The Twin" prime suspects for faulty switch contacts are:
J203, Pwr Amp Input jack
S201B/A, FX Level Select switch
S12A/B, reverb select switch

Edit - I see that you were reporting the successful fix while I was typing.
Glad to hear the good news. (And you didn't even need to replace the output transformer)
Tom