A couple new schematics you may find interesting

Jim Zuehsow · Mar 13, 2007

I uploaded an interesting condensor mic pre and an amplifier which uses tubes and FETS. Here's the link:

http://twin-x.com/groupdiy/displayimage.php?pos=-813

Jim

pstamler · Mar 14, 2007

That tube/FET hybrid is interesting -- basically a feedback pair with two source followers in a row. But it must have some pretty serious stability problems, as it's dripping with little compensation caps.

Peace,
Paul

Jim Zuehsow · Mar 14, 2007

They also had one design with only 2 stages instead of 3, in case you didn't need quite as much omph.

Jim

beatpoet · Mar 14, 2007

I'm wondering how it sounds :?:

clintrubber · Mar 15, 2007

Thanks for posting :thumb:

BTW, the mentioned patent is here:

http://www.pat2pdf.org/patents/pat5017884.pdf

Regards,

Peter

skipwave · Mar 15, 2007

MOSFET source followers in push-pull? Is that what's going on with that output stage? I have been getting curious (hybrid-curious :wink

about MOSFETs in tube circuits.

The Mu Stage topology is more interesting to me. The idea of the two devices working to optimize each other is more appealing to me than separate stages. I've been thinking about converting the first stage of my 6EM7 pre to a Mu Stage.