Any love for the Fender Supersonic?

[EtherealWidow]

Particularly the 22. Great sounding "burn" channel. Got a 330v PT that I might use for it.

[Stevem]

There are folks who love them! That's the one amp I have not got one in yet to repair!

[cbass]

Unknown Hinson plays one

[beasleybodyshop]

Unknown Hinson plays one

You mean Early Kyler?

[beasleybodyshop]

On a serious note, here is the super sonic 22 schematic. I like how the "burn" switch on the first gain stage is a PAB. lol.

Very cool ideas in the schemo. Reading now...

[EtherealWidow]

PAB? Was ist das? I think a little stripped down burn channel of this and would be great. The 330 I have is an Edcor so I'm going to back bias the power tubes which will help get the B+ closer to what it's supposed to be.

[beasleybodyshop]

Looks like that first relay switch on the first gain stage is bypassing the tone stack, which would give you a gain boost.

There are lots of cool little tone shaping elements in this circuit. I went out and tried one at my local brick and mortar, very cool amp!

[EtherealWidow]

It's actually not bypassing the tone stack. The tone stack for the burn channel just comes after the 4th stage IIRC. (posting from my phone) Yeah, it's a sweet amp. Couldn't find the 60w or 100w to play in person, but from clips the 22w sounds a little brighter and more articulate than the 60. There's quite a few differences between the 22 and 60. The 60 actually has 2 PI's. It drives the reverb circuit with the cathode side of a cathodyne PI and then has the LTPPI for the power tubes.

[beasleybodyshop]

It's actually not bypassing the tone stack. The tone stack for the burn channel just comes after the 4th stage IIRC. (posting from my phone) Yeah, it's a sweet amp. Couldn't find the 60w or 100w to play in person, but from clips the 22w sounds a little brighter and more articulate than the 60. There's quite a few differences between the 22 and 60. The 60 actually has 2 PI's. It drives the reverb circuit with the cathode side of a cathodyne PI and then has the LTPPI for the power tubes.

It looks like Relay K1 allows for bypass of the first tone stack on V1 input...maybe i am misunderstanding something here?

[EtherealWidow]

All the switches labeled vintage/burn function as one switch when the button is pressed on the front of the amp. The schematic shows the amp operating in the vintage channel by default. When you press the channel button on the front of the amp, it does indeed take that particular tone stack out of the circuit, but inserts another one down the line from there that's also plate driven, so there's really no signal loss.

[beasleybodyshop]

All the switches labeled vintage/burn function as one switch when the button is pressed on the front of the amp. The schematic shows the amp operating in the vintage channel by default. When you press the channel button on the front of the amp, it does indeed take that particular tone stack out of the circuit, but inserts another one down the line from there that's also plate driven, so there's really no signal loss.

OK now i follow.

[gingertube]

Had one here for ages. Burn Channel had been modified and the instruction was to put it back to original. I did that and then gave it a test run. At 8 or 9 or above on Gain 1 or gain 2 it would whistle at me. Actually a bad design with 3 gains stages of the burn chan all off the one power supply node. After much tracing with the oscilloscope and a few cus words I decided it had to be a form of motorboating (since adding gridstops everywhere didn't help and so wasn't parasitic oscillation).
Tacking a 470nF/630V polypropylene cap from the top of the 330K anode load resistor (the power supply nodel) to 0V cured it.
Cheers,
Ian