[Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke

[R.Measures]

Tying one side of the heater to the cathode - and feeding the 
(not-grounded) heater through a bifilar RFC is done to prevent an arc 
from the cathode to the heater in case of a +HV to chassis-ground 
flashover.  • note -- such an arc often severs the heater wire.

On Mar 4, 2005, at 6:22 AM, Paul Christensen wrote:

> Last week's discussion of GG filament chokes got me thinking about 
> modifying
> my Alpha 77Dx which I believe, ties one side of the filament to the 
> cathode.
> I would like to cut this tie and user a R.F. Parts Co. FILRFC-30 
> filament
> choke.
>
> http://www.rfparts.com/choke.html
>
> I am assuming that a combination of HV-rated 0.01 uF and 0.1 uF disc 
> caps
> could be used to bypass each side of the filament tube terminals to 
> ground.
> Anything else I should consider before doing this?  Thanks!
>
> -Paul, W9AC
>
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org