Many thank to everybody. It has helped me a lot. 

Great tones from both the cassette recorder and that headphone amp! As has been said, If it sounds good, it is good! I've no idea how bands like The Who could've tollerated standing in front of amplifiers that had to be loud enough for the venue, rather than the modern method of mic'ing little tone gods for further amplification into PA's in FRONT of the band. Of course Pete's mostly deaf now...
Yes I guess my cab's speakers are no longer "off-the-shelf". The more I learn the more I mess with things. Made beer can dust caps for the rest of them last night because it does sound better lol.

Getting a bit further.
Tomorrow I'll test the "compressor" circuit to see what it does to the signal.

That.

Enzo used to strip knobs, fuse holder caps, maybe a handle or corner protector, a speaker, which might prove useful later.

Sometimes even a Power transformer.

Quote from: anderson4584 on July 10, 2025, 10:56:55 AMI can always change to channel 3. But I have issues getting it back to channels 1/2. I opened up the footswitch and everything seems fine in there. I played with the wires a little bit to see if it would change anything and the only thing that changed anything is.......it typically works fine when I hold the footswitch upside down.

That makes no sense.
Do you hold pedal in your hand or put in on the floor? (so floor can push both buttons at the same time)

 

QuoteWhen this issue happens, I also typically lose a lot of power output while playing, but ONLY in the bridge pickup. If I switch to the neck pickup, I get power back. That makes even less sense..

-

QuoteTried using another 2 switch footswitch I have that goes to a Peavey classic 20MH (this works... but it ends up having the same issue, which leads me to believe it's the amp).
-Swapped some cables around, and tried different guitars.

For testing, plug a spare TRS/"stereo" plug in theb Fsw jack.
Cover open, pins visible.

Solder a short (1" to 2") piece of wire to plug ground terminal.

Then touch either of free pins (to simulate temporary switch) with the free end ... what happens?

Repeat test but now soldering wire end to a pin or another to simulate a latching switch.

This way you are testing using a bare minimum "pedal equivalent" device, very simple and easy to understand, which depends on nothing else.

Post results.

Any ideas?

Do you know any of the local Fender dealers?  A lot of the amps are just replaced under warranty and the old ones have to be scrapped.  Some dealers strip off the knobs to keep for rental stock, etc.

Just the button or the full switch?
Post a switch picture.

CE distribution in Arizona usually has all parts Fender, even some not available from Factory any more

https://www.cedist.com/

This footswitch needs to have momentary switches.  It sounds like yours may have latching type switches.

Does anyone know where I can find a little white pushbutton for the newer Fender Rumble Series amplifiers?