I've done several of the Triode Electronics mods on a couple of ST-70s and also a set of Mk-IIIs. These were all full mods where not only was the cap board replaced but the driver board as well. I just finished a gut-rehab of a ST-70 which now powers my second system. The modded amp runs 6L6GC outputs instead of EL34s.
The Triode mods are well thought out and documented and they have a great deal of flexibility. You can use a variety of output & driver tubes (as in my example above) and you can even run the driver board, the outputs or both in triode mode.
In short, the Triode Electronics design is a first class option.
PS, the instructions for the Triode mods are available on their web site if you search a bit.
I've also worked on a Curcio modded amp. It was good but I prefer the Triode option.
The Triode mods are well thought out and documented and they have a great deal of flexibility. You can use a variety of output & driver tubes (as in my example above) and you can even run the driver board, the outputs or both in triode mode.
In short, the Triode Electronics design is a first class option.
PS, the instructions for the Triode mods are available on their web site if you search a bit.
I've also worked on a Curcio modded amp. It was good but I prefer the Triode option.