[Amps] cathode to ground in tetrode amp

[Mike Bondarev]

Hello!

> IMHO, the cathode resistor is not "obviously a mistake."  Rich 
> Measures' website (and I) often recommend some cathode degeneration,
> aka negative feedback, primarily to help linearity.

If you are using "standard" Russian made socket for GU-84B tube (like
this one
http://cgi.ebay.com/GU-84B-4CX2500A-Svetlana-CHIMNEY-Socket_W0QQitemZ5858878407QQcategoryZ4675QQssPageNameZWDVWQQrdZ1QQcmdZViewItem )
it already have small value resistor (0,43 ohms) installed inside the
socket. This will give you a small negative feedback. So you don't
need anymore! Just connect socket to the ground. You must have stable
voltage supply for screen and greed.

Regards, Mike RL3BM