[ARC5] Running receivers at low B Voltage

[Dennis Monticelli]

Less gain is the biggest thing you will notice.  You can mitigate that by
adjusting the screen voltage divider (just short a resistor as I recall).
I have run 60 to 70V satisfactorily (from 9V batteries) and still had
enough audio for driving a speaker.

Dennis AE6C

On Sun, Sep 7, 2025 at 8:23 AM Ken Kinderman <scr274 at gmail.com> wrote:

> Has anyone had experince with receiver HV lower than the nominal 235 VDC
> dynamotor output? I like to run everything at or slighly below ratings. Not
> interested in squeezing out every last watt from the transmitters, etc.
>
> So except for the times I am using the dynamotors, I run the receivers in
> the test jig and out of the racks at about 175VDC, transmitters at about
> 540VDC. (By the way, even 175VDC is enough to blow the .05's, so I am on a
> long term quest to replace all, either with re-stuffed cans or just wiring
> them in. Otherwise, letting them fail is like playing condenser
> Whack-a-Mole)
>
> My question is about the receivers... aside from maybe the 12A6, are there
> any downsides to lower overall plate voltage?
>
> Thanks
>
> Ken
> W2EWL
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