|Author:||John Polstra (registered user: 641 posts )|
|Date:||Sun, Aug 19th, 2012 @ 16:53 ( . )|
I haven't modeled or tried a 12AU7 cascode, but I think it might work just fine. The plate resistance of the upper tube effectively gets multiplied by something like (mu + 2), so I think the output impedance would be primarily determined by the plate resistor of the top tube. I guess you'd need a pretty high supply voltage so the plate resistor could be reasonably large. Probably not worthwhile, when you could simply use a pentode instead.
--* A transformerless reverb driver
8/19/2012 @ 18:24--tubeswell
--- 13 Users Online --- 41 Recent Unique Posters