Krank Rev Jr Pro 50W

Tube or solid-state, this section goes to eleven!
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grrrunge
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Post by grrrunge »

I Haven't had much action around these parts lately, and the channel switching in this bad boy started acting up, so let's get the trace show running.
I haven't seen schematics for these elsewhere :horsey:

First up: Board A - the preamp board.
preamp board top side
preamp board top side
preamp board bottom side
preamp board bottom side
sandwiched 80/20
sandwiched 80/20
sandwiched 20/80
sandwiched 20/80
sandwiched 50/50
sandwiched 50/50
Board B contains the power amp and tube driven effects loop. I'll take photos of it as soon as I finish tracing board A.
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Optical
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Post by Optical »

I think the Rev Jr is the krankenstein with a fixed tone stack and a BMP tone control after that?
Here's a schem that might be a good place to start comparing
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krank rev.jpg

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grrrunge
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Post by grrrunge »

Looks like they have quite a bit in common, though it seems this PCB accomodates circuitry to switch between a solid state or tube buffered effects loop instead of multiple master volumes ;)
Here's the work in progress. It's linking to my dropbox, so this will always be the latest revision.
https://www.dropbox.com/s/6597c8n31ii0z ... p.png?dl=0
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grrrunge
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Post by grrrunge »

The preamp board is pretty much done - this was a messy bugger to trace out. When comparing it to the Mesa and Soldano amps I've otherwise worked on, even the japanese SP-77 knockoff sports a nicer PCB layout :lol:
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grrrunge
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Post by grrrunge »

A true believer in the magic of Sherwood Forest Pedal Pirates
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Optical
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Post by Optical »

Thanks - very tidy work

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