[Amps] filament supply options

[Bill Fuqua]

         Since most all high current 5 volt DC power supplies have a 
positive output, you may be one step ahead. Often the cathode needs to be 
made slightly positive to reduce idling current and your effective bias 
voltage would be 2.5 volts unless you float the supply and  use a resistive 
divider (say 1ohm for each resistor)  and ground the tap so that the 
filament would have +2.5 on one side and -2.5 volts on the other.
     My main worry about using an active (switching or linear) DC supply 
would be how will it perform in the very high RF fields? The RF could cause 
it to do some strange things. Such as either shutting down or even worse 
going to max voltatge.

73
Bill wa4lav

At 05:34 AM 4/26/2004 -0700, R.Measures wrote:

>On Apr 26, 2004, at 4:04 AM, Don Havlicek wrote:
>
>>I believe you meant to say:
>>
>>"Hot-R is 8.3 times as much as Cold-R"
>
>ð  Correct.  Thanks for the heads up, Don.
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