Krank Rev Jr Pro 50W

Tube or solid-state, this section goes to eleven!

Krank Rev Jr Pro 50W

Postby grrrunge » 09 Feb 2018, 01:41

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.
You do not have the required permissions to view the files attached to this post.
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk

For this message the author grrrunge has received thanks:
J0K3RX (09 Feb 2018, 04:36)
User avatar
grrrunge
Diode Debunker
 
Posts: 758
Joined: 20 Mar 2010, 11:51
Location: Copenhagen, Denmark
Has thanked: 59 times
Have thanks: 207 times

Re: Krank Rev Jr Pro 50W

Postby Optical » 09 Feb 2018, 06:01

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
You do not have the required permissions to view the files attached to this post.

For this message the author Optical has received thanks:
grrrunge (11 Feb 2018, 17:57)
Optical
Breadboard Brother
 
Posts: 53
Joined: 28 Jul 2016, 23:44
Location: Auckland
Has thanked: 7 times
Have thanks: 11 times

Re: Krank Rev Jr Pro 50W

Postby grrrunge » 11 Feb 2018, 18:02

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
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
User avatar
grrrunge
Diode Debunker
 
Posts: 758
Joined: 20 Mar 2010, 11:51
Location: Copenhagen, Denmark
Has thanked: 59 times
Have thanks: 207 times

Re: Krank Rev Jr Pro 50W

Postby grrrunge » 16 Feb 2018, 09:12

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:
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
User avatar
grrrunge
Diode Debunker
 
Posts: 758
Joined: 20 Mar 2010, 11:51
Location: Copenhagen, Denmark
Has thanked: 59 times
Have thanks: 207 times

Re: Krank Rev Jr Pro 50W

Postby grrrunge » 21 Feb 2018, 12:58

A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk

For this message the author grrrunge has received thanks: 2
FiveseveN (21 Feb 2018, 20:57), snofla1900 (21 Feb 2018, 13:44)
User avatar
grrrunge
Diode Debunker
 
Posts: 758
Joined: 20 Mar 2010, 11:51
Location: Copenhagen, Denmark
Has thanked: 59 times
Have thanks: 207 times

Re: Krank Rev Jr Pro 50W

Postby Optical » 21 Feb 2018, 23:14

Thanks - very tidy work
Optical
Breadboard Brother
 
Posts: 53
Joined: 28 Jul 2016, 23:44
Location: Auckland
Has thanked: 7 times
Have thanks: 11 times


Return to Amplifiers

Who is online

Users browsing this forum: Bing [Bot] and 3 guests