Bob wrote:
Last time I went down that road, finding a FET with *low* enough Gm to match the tube was the issue.
You can always lower the gm of a FET by adding source resistance. To replace pentodes, you can use cascoded FETs (you may or may not be able to use the existing screen supply for the cascode gate reference -- if not, you'll need to figure out what else to do).
Supertex makes some depletion-mode MOSFETS that have characteristics similar to tubes.
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
