Prepping myself for my first st70 rebuild. I am trying to decide what driver to use. Dont know much about the circuitry options but I know I want a CCS. seems like a no brainer. I previously did 2 of my 4 MKIII's with 6DJ8 based driver boards which I purchased from VTA several years back. I could swear that those boads were an exact copy of the Curcio MKIII boards, because the instructions were pretty much copy and paste. Well it seems VTA abandoned that design in favor of 12AU7 based boards like their st70 board.
The following 3 things bother me:
1) I don't have a supply of 12AU7 tubes to work with and I would have to spend stupid money for some decent NOS.
2) I hear more bad than good things about the 12AU7 as far as musicality, linearity and lifespan.
3) I have a nice collection of Amperex Holland 6922 PQ's to work with.
Curcio has his premium mod which is CCS and based on 6DJ8 family but it costs more than what I paid for the amp.
I also noticed the new triode board supports 6992's
Can this design be modded to accept 6922's
I would really like to work with what I have and not spend a lot
Any help would be greatly appreciated.
Thanks