[ARC5] Running receivers at low B Voltage

[Ken Kinderman]

Thanks Dennis. I'll look at the sceen voltage. I have plenty of audio.
Maybe try an A-B test one of these days


On Sun, Sep 7, 2025 at 11:43 AM Dennis Monticelli <
dennis.monticelli at gmail.com> wrote:

> 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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