Hey-Hey!!!,
For simplest RIAA, the pasive between the two triodes is quite appealing. I have a few that can be adjusted for almost *ANY* pair of triodes. It ought to be fairly easy to implement. I don't think I am going to go with mono supplies. The loads ought to give me a lot of PS isolation.I have a pair of 9-pin sockets, salvaged from Tektronix diff amp plug-in's. The socket is suspended on Be-Cu springs. One of a kind( well..two of a kind ). Been saving them just for a phono pre.
now....which two triodes?
I'll fit this in between the construction of the 4E27 and 813 amps. The 813 really has me going. 80W from a pair, in Class A.
cheers,
Douglas