[ARC5] Running receivers at low B Voltage

[Dennis Monticelli]

At the voltage range I stated the receiver only draws around 10 mA so 9V
batteries work and no worries about hum or line noise.

On Sun, Sep 7, 2025 at 8:49 AM Ken Kinderman <scr274 at gmail.com> wrote:

> 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
>>> ______________________________________________________________
>>> ARC5 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:ARC5 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: https://www.qsl.net/donate.html
>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20250907/1752dcc6/attachment-0001.html>