Great to see this thread thriving! Thanks to all for contributing. I've been out of the loop again for awhile, trying to save more money for gear, so I've missed some interesting movement on this thread since away...
Props to Jim and the gang at Microphone parts for putting together the mod kit; I will definitely be purchasing one in the future! This is how a community of interest can make something move.
I've currently got my SP1 apart again on the bench to run down a bug from the last round of mods; fun fun! If I can't figure it out, I'll post some info and see if the local genii can't shed some light on my fu%k ups.
It's really fun to see everyone participating in the mods process, trying out new parts, even getting into redesigning the circuit. I've learned so much, mostly from the other participants, and owe as much for the help I've received from others as well.
Let's keep this rolling...
@dariuso, have you been testing the mic after fully reassembling it? Mine always hums like the dickens when I have the body apart. Oh wait, I see you're dealing with an MXL, not the SP1. Similar solutions, though; let us know how that bypass works out...
EDIT: Don't see the mod kit link at mic parts.com yet, looking forward to some further info when it comes out, with pricing, etc. I imagine the kit will be worth the searching you have to do to find the 305 and other rather esoteric replacement parts, like the matched transistors. Again, Props to Jim and the microphone-parts.com crew!