Yep- bottom tube cathode resistor sets top plate voltage, middle tube grid
sets bottom tube plate voltage. Bottom tube operates in transconductance
(i.e., into the ~300 ohms cathode impedance of the top tube), giving good HF
performance and gain (the thing behaves roughly like a tetrode).

Tim

--
Deep Fryer: A very philosophical monk.
Website @ http://webpages.charter.net/dawill/tmoranwms

"Oppie" wrote in message
.. .
Interesting how the cathode and Plate of V4 are connected. Is that what
they
called Cascode? Grid of the upper half of V4 is at a positive bias to set
the operating point.


"tube.guy" wrote in message
news:LHXLh.40547$yj7.22072@trnddc02...
Here's a schematic of the tube amp I have on ebay.
Thanks for the bandwidth!!!