[ARC5] Running receivers at low B Voltage

[J Mcvey]

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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