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

["Paul Christensen" <w9ac@arrl.net>]

Whoops - my mistake.  The 77Dx's 8877 does not tie the cathode and filament
together.  One side of the filament is grounded.  Would it still be
advisable to add the common-mode filament choke anyway?

-Paul, W9AC

----- Original Message ----- 
From: "Paul Christensen" <w9ac@arrl.net>
To: "AMPS" <amps@contesting.com>
Sent: Friday, March 04, 2005 9:22 AM
Subject: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke


> 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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