I will get my hands on this modified st70 soon. As Im a newbie in hi-hi audio and Dynaco as well, I will be glad if you guys can help me with some tips concerning upgrading the amp. Also would like your opinion concerning current changes already made on the aplifier.
Well, looking at VTA upgrades, I would like to understand what kind of changes can I expect between original type board x upgraded VTA ST70 board with 3 tubes instead the 2 original 7199.
Also, concerning VTA upraded boards, what are the differences between classic 12AU7 board x octal 6SN7 board. Is it possible to hear any real audio change when comparing both?
PS: I live in Sao Paulo-Brasil and current outlet voltage is 127Vac. Any transformer change is needed if I decide to go with 6SN7 octal board?
All help is welcome, thank you very much!!