mark1406
Well-known member
The link is to my efforts in rebuilding the SOB amp into something that sounds good and is similar to it's original form. I have pull pots to add the brightness switch that was in the Mark 1 and a mid switch. I will use the Dumble 2200pF value over the Mark 2 value of 750pF as I preferred the sound of that value.
https://ampgarage.com/forum/viewtopic.php?f=8&t=33276&p=411698#p411698
I find most of the amp quite straight forward with the exception of the P.I. stage which seems to vary from amp to amp, for example my late 70's Mark 1 Boogie had two 330K grid leak resistors, and used a 12AT7 instead of the 12AX7 in the original amp diagram.
Regards
Mark
https://ampgarage.com/forum/viewtopic.php?f=8&t=33276&p=411698#p411698
I find most of the amp quite straight forward with the exception of the P.I. stage which seems to vary from amp to amp, for example my late 70's Mark 1 Boogie had two 330K grid leak resistors, and used a 12AT7 instead of the 12AX7 in the original amp diagram.
Regards
Mark
