[Amps] On Thu, 16 Sep 2004 21:54:56 -0700, Leigh S. Jones wrote:>rule 1: never apply plate voltage to the tube nor apply drive power>until after the prescribed filament warm-up period has elapsed_________________kill the B- lead for the HV

[Angel Vilaseca <avilaseca@bluewin.ch>]

Hi

Will Matney wrote:

>In any amps I've made, I did kill the B- lead for the HV until the 
>antenna relay pulled in even though it was biased to cutoff on idle.

How do you do this? Switching several Kilovolts must surely be done with
an expensive vacuum relay?

You certainly cannot switch the HV transformer primary on and off every
time you cycle between xmit and receive, because of the HV capacitor
current inrush. 

73

Angel Vilaseca HB9SLV

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