The Amp Garage

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Looks like .022uf caps for v1a and v1b couplers. Phase inverter looks like .047uf or .05uf output caps. Phase inverter input might be .001uf but the cap looks like the same size as the trem caps so this isn’t certain. Trem caps looks like .02uf Mid switch has a 4.7m across it for anti-pop purpose. T...

More pics. Different amp, same model. Notice the lack of treble peaking capacitors at the resistors preceding the v1b “level” control. One was preceding the “level” control and one was returning from the reverb circuit. Cathode follower 100k moved off the board to a grounded ring terminal. Mid boost...

Slowly making way through the schematic. This is where I'm at so far. Assume it has errors, a little bit more to go. Thanks, Aaron Couple things: There’s a cap connected to the treble cap entrance. Is the rock/jazz switch possibly being used as what we usually know as the mid boost function instead...

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Slowly making way through the schematic. This is where I'm at so far. Assume it has errors, a little bit more to go. Thanks, Aaron Thanks a ton for making this! I’ve been staring at the pics for a couple days and I think you have the majority of it nailed down. Super exciting. Couple things: There’...

Double post

It’s like a cascaded Plexi topology. We’ll have to guess on a lot of values and little things here and there.

Preamp looks easy enough to decipher the topology.

By the way , what is that seemingly 18-78ohms ( can't figure out the color of the first ring brown ? purple ? ) resistor grounding the entry of the tone stack ( I haven't put it in the scheme yet ) ? What's the point of such a tiny resistor there ? Have I got it somehow wrong on the channels config...

More pics. Sorry I don’t have pics under the dog house.

Gut shots from one the clones should help decode this thing. Finally!

I have never heard of entity’s called the feedback police anywhere on this planet, so just increase the value of that 27k resistor until you have a smile on your face my friend! I have some zero ohm 1/2 watt resistors here, I can send you one if not having a resistor there on the fiber board makes ...

I've recently acquired a Rivera era 1984 4x10 Fender Concert II and I've been looking at the schematics and trying to become familiar with the circuit and it's peculiarities. I've seen a couple differences in two schematics that I'm wondering about. One difference being the negative feedback resisto...

RIP

I've not calculated it, I've played it a bit and it definitely sounds marshally. I've not had extensive playing on many different amps except those I've built, but I have built sluckey's dual marshall and it's in that definite ballpark for sure. ~Phil Thanks for documenting the process and offering...