[Amps] Grounded grid 8122's

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Tue, 21 Jul 2009 21:55:21 -0500, "Gary Schafer" <garyschafer at comcast.net>
wrote:

>. There is a difference in what we all call
>"grounded grid" and "cathode driven"

REPLY:

The difference is mostly semantics. A grounded grid amp where the grid(s) are
connected directly to ground is definitely cathode driven. 

By comparison, a cathode driven amp may or may not have its grid(s) grounded for
DC, but it must definitely have them grounded for RF (heavily bypassed to
ground).  

Some tetrodes can function properly with the screen connected directly to ground
and others can not. It is all a function of the tube's internal design. 

73, Bill W6WRT