Curcioaudio.com is one of the better Dynaco ST70 mod sites. Joe, the owner, knows em cold. All the mods are discussed there and he carries all the parts. No "best configuration."
Some of the ST70s iron is great. They really vary as to condition in other ways. Some even say the phenolic boards cause chemical changes in the electronics and change over time and with it the sound - no two are the same.
If you have an older Series 1 the passive componants probabaly could use to be replaced. They weren't expected to go 50 years. There are lots of versions of these amps over the years so advice about moding is tough. What is the number stamped on the output transformer? A-470, maybe.
Lots of discussion in archives at Audioasylum diy tube section on point.
Have fun,
i remain,
Some of the ST70s iron is great. They really vary as to condition in other ways. Some even say the phenolic boards cause chemical changes in the electronics and change over time and with it the sound - no two are the same.
If you have an older Series 1 the passive componants probabaly could use to be replaced. They weren't expected to go 50 years. There are lots of versions of these amps over the years so advice about moding is tough. What is the number stamped on the output transformer? A-470, maybe.
Lots of discussion in archives at Audioasylum diy tube section on point.
Have fun,
i remain,