I am going to try for a two-stage valve pre for MC. Cascode of the front end stage. Probably a pair of triode strapped, high gm pentodes. Get the first stage gain in neighborhood of 200:1 and feed the RIAA filter and end with a CCS-loaded 6BQ7 perhaps. Getting half or a third of mu-squared from a cascode is not too difficult I think.the troubles I can see from here are mainly the high output z of the cascode stage and the correspondingly high z RIAA EQ. The Guinevere-style plate load will do a good job of driving cables.
I may decide to put in a variable capacitance in the front, as the cascode will be nearly free of Miller effects.
Still looking at it.
regards,
Douglas
That and noise....heh-heh-heh!
Posting Rules
Members
Search
Help
Register
Login
Get a T-Shirt!
