[Milsurplus] ARC-5/SCR-274 Receiver HV

[Bob Camp]

Hi

“Back in the day” (1960’s) when I started playing with ARC-5 receivers, it was pretty common for folks to suggest you run 150 to 180V. Being a kid, I didn’t dive too deep into the “why”. I just went with what folks told me. It always seemed to work pretty well. Was it written up anywhere? I have no idea.

Bob

> On Sep 7, 2025, at 10:23 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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