Hi guys, new here, great place. So i want to get an mp1 and do mod 4 to it.
I have a basic understanding of schematics and tube preamp circuits,
but im having trouble understanding the first coupling section and the clean ch
in general.
1. What is the purpose of the -15v feed to the cathodes of the first two stages?
To increase volume of the od chs? Mod 4 calls for its removal.
2. What is the signal path of the clean ch? Cathode to cathode, out of the plate
to the other two stages, 4 stages total?
Basically I want to fatten it up and make it a tad bit more harmonic edgey saturated.
.022 coupling caps throughout, lower 1st two cathode resistors, higher 1st two cathode
bypass caps, the Marshall value 3rd cathode 10k, and maybe some 470/470 1st and 3rd.
I want to stick with that and use a switchable boost to tighten. Then if I want more, I'll do the
100p low passes, and the Soldano 3rd plate snubber, and the 3.666 od pot repositioing.
What I dont want is to dirty up the clean. Will I?