Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: gitarzysta on September 23, 2018, 06:15:10 am

Title: Marshall Origin schematic?
Post by: gitarzysta on September 23, 2018, 06:15:10 am

Hello

I wonder if anyone managed to reverse-engineer the PCB of Marshall Origin (esp. 20W model).
I am especially curious how tilt and boost work etc.
Is it still two channels, similar to old Plexis (1 x full 12AX7 per channel) but with blend/tilt control? Would channel cascading be possible?
For sure schematic would answer all these questions with ease.
Any help would be appreciated.

Thanks
Gitarzysta

Title: Re: Marshall Origin schematic?
Post by: gitarzysta on December 01, 2018, 05:59:38 am

A couple of months passed - any update on schematic availability?

Title: Re: Marshall Origin schematic?
Post by: Jack1962 on October 19, 2019, 04:23:39 pm

I haven't had the chance to really take a close look at mine yet , I have the Origin  50 Head . It is a single channel amp . It doesn't come close to sounding like a plexi it is closer to a JCM 800 with a large amount of treble . The factory tubes are Chinese and they suck I replaced the preamp tubes with Tung Sol and the power tubes with Big Bottle 6CA7's this greatly improved the tone of this amp. I have the tilt turned all the way down. The amp likes pedals makes a world of difference.  If you bought this amp thinking you where buying a $500 plexi you will be disappointed.  However,  it is a Marshall it sounds like a Marshall.