Marshall 2195 1970's lead and bass head

[maxjt]

Hi

I've just acquired a 1976 Marshall 2195.It works to a degree but sounds pretty dire.

I understand that it uses mj3001 and mj2501 however on this one these have disappeared and been replaced with 2n3055 x2 and mj2955 x2 with some circuit changes.

The filter caps are original and need to be replaced asap.

I'm rather more au fait with tube amps and am pondering the best approach to take with this one.

I can obtain the correct darlingtons and filter caps.

Would it be a reasonable approach to return this to stock as per the factory schematic.

I cant say it'll ever be a great amp but i'm intending to keep it as a spare in the event of any of my tube stuff goes down.

Thanks

Johnston.

 

[JonSnell Electronic]

Oh dear, subjected to butchery!
MJ3001 and its complement are Darlington pairs with a gain of more than 1000. 2N3055 and MJ2955 are not and have a gain of less than 70.
The Darlingtons are still available through many suppliers. No wonder it sounds sh one t!
A rebuild and it will be fine.