[Amps] B- questions

[Bill, W6WRT]

On Mon, 09 Nov 2009 11:02:44 -0500, "David C. Hallam" <dhallam at rapidsys.com>
wrote:

>
>Isn't it also true that in a grid driven amplifier, the cathode is 
>connected to ground and the only B- connection to ground is through the 
>plate current meter.  This is done so the plate current meter isn't also 
>reading screen current.

Correct. When B- is connected directly to ground there is no need (or place) for
the clamping diode under discussion. It is only needed in GG (cathode driven)
amps where the B- is floating with respect to ground. 
>
>In my amplifiers, volt meters are located in the power supply cabinet 
>and behind a plastic window.

Good enough. 

73, Bill W6WRT