[Amps] filament choke questions

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Thu, 8 Oct 2009 19:57:51 -0400, Don Kessler <ki6sz at sbcglobal.net> wrote:

>
>>From a conceptual perspective -- especially at VHF, I think the capacitive 
>coupling between cathode and filament could be significant.  Why shunt 
>cathode drive to ground via the filament?

REPLY:

Very little shunting to ground will be taking place. The capacitance merely
becomes part of the tuned input circuit. 

Having said that however, I agree with others that a filament choke should be
used but for the other reasons they have stated. 

73, Bill W6WRT