[Amps] HIGH FILAMENT VOLTAGE

[Bryan Swadener]

I suggest NO diodes or resistors in the LV side of the xfmr.
A buck transformer in the primary loses or looses [sic] the
least power. The secondary needs to handle the amplifier's
primary current. A multiple primary and/or secondary buck
xfmr allows selection of the output.

Bryan WA7PRC 

   Date: Sun, 11 Dec 2016 05:35:53 +0000
From: Bill W6WRT
To: Amps group <amps at contesting.com>
Subject: Re: [Amps] HIGH FILAMENT VOLTAGE

On Sat, 10 Dec 2016 22:38:25 -0600, Jim wrote:

>You can reduce the voltage with parallel back to back diodes in series with each tube filament.
>20 amp/40v diodes are cheap and do not present a mounting challenge.

REPLY:

Yes, but remember those diodes will get hot. I suggest the kind that
can be mounted to the chassis. Also, at that current level they may
produce hash in the receiver. If so, bypass each one with a .01
capacitor.. 

73, Bill W6WRT