Marshall JMP 2103 - Hermansson Amplification

This is a Marshall 2103 from 1979. It was a combo from the beginning but someone put the amp in an old Marshall headshell at some point. 

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It had some smaller modifications done to it.

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The whole preamp is removed and a board for the tube buffered effects loop is installed.


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The new preamp begins to take shape!

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Finished!

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I've rebuilt the whole preamp section and made some changes to the power amp and the power supply. This amp has dual footswitchable gain and volume controls + a footswitchable gain boost. So you can reach four different levels of gain using the footswitch. Each gain control has their own fat/normal/bright-switch. This amp also has a three-way bass-boost switch for extra bottom end, a three-way mid-boost switch for cutting thru the mix better and a punch-control. It has a tube buffered effects loop as well.



 
fender126":2w0dkkki said:
That amp sounds amazing! Your builds continue to be my favorite. Thanx for continuing to share them! :rawk:

Yup, I am also a fan and find these mods to be my favourite.
 
Sounds killer Henric!
Rolls off wonderfully
This one sounds like it has more bottom? Maybe slightly less percussive down low?
Just going on what I can remember from past vids..
I'm probably full of shit :LOL: :LOL:
 
JTyson":3qo2899a said:
Sounds killer Henric!
Rolls off wonderfully
This one sounds like it has more bottom? Maybe slightly less percussive down low?
Just going on what I can remember from past vids..
I'm probably full of shit :LOL: :LOL:

Thank you guys!!

Yes, this amp can be dialed in for more bottom and it's not as tight as some of my other builds. :)
 
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