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Discussion Forum for Mesa Boogie Products
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PostPosted: Mon Nov 06, 2017 2:41 pm 
Mark III

Joined: Tue Sep 20, 2011 11:15 am
Posts: 191
Hi folks.
Could any of the more knowledgeable guys on here please tell me what I would need to have done to an SOB 60 watt combo to make into a mark 1 or as close as possible?
Mine has the limit control which I never use.I would like to have a presence control added too in place of the limit control.
I'm not familiar with the differences in circuits but other than getting rid of the limit control or having it replaced with a presence control(Which a few of these amps actually had)what else would need to be changed to the pre amp to make it more like a Mark 1?
It's got a great clean sound but the overdrive(input 1)doesn't sound that great.I've tried some NOS preamp tubes.
Any help would be greatly appreciated as this is something I've been wanting to have done for a while now.

PostPosted: Tue Nov 07, 2017 6:21 pm 
Mark II

Joined: Tue Mar 25, 2014 10:14 pm
Posts: 96
Location: New York City
It's relatively straight forward... PI circuit and maybe some plate voltage changes. Some SOB's have both Presence and Limiter...

This thread should give you a hand...

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