[ARC5] Running receivers at low B Voltage

[Dennis Monticelli]

Thanks for the corrections, guys.  I now remember removing the ground lug
to the bottom R of the divider to boost the screen voltage at low B+.

On Sun, Sep 7, 2025 at 9:41 AM J Mcvey <ac2eu at yahoo.com> wrote:

> An even simpler way is to pull the ground lug out from the bottom of the
> screen divider resistor.
> No desoldering required , just loosening the resistor mounting screw and
> pull it out. Totally non destructive and reversible .
>
>
> Sent from my undisclosed location
>
> On Sunday, September 7, 2025, 12:22 PM, kgordon2006 at frontier.com wrote:
>
> On 7 Sep 2025 at 8:43, Dennis Monticelli 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).
>
> No. Not "short". Move one wire from the junction between the two
> vertically mounted wire
> wound resistors in the rear of the receiver to the hot end. One end of
> that pair is the "hot" end
> and the other end is grounded. Doing so makes a huge improvement in
> sensitivity and other
> good effects at low plate voltages.
>
> >  I have run 60 to 70V
> > satisfactorily (from 9V batteries) and still had enough audio for
> driving a speaker.
> >
> > Dennis AE6C
>
> Ken W7EKB
>
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