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Krank Rev Jr Pro 50W

PostPosted: 09 Feb 2018, 01:41
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.

IMG_7828.jpg

IMG_7837.jpg

combo1.jpg

combo2.jpg

combo3.jpg


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.

Re: Krank Rev Jr Pro 50W

PostPosted: 09 Feb 2018, 06:01
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

Re: Krank Rev Jr Pro 50W

PostPosted: 11 Feb 2018, 18:02
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/6597c8n31ii0zr3/krank_rev_pro_jr_preamp.png?dl=0

Re: Krank Rev Jr Pro 50W

PostPosted: 16 Feb 2018, 09:12
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: