[ARC5] [Boatanchors] [Milsurplus] A Super-Easy 95 Volt B+ Supply for Your Projects.

[Bill Cromwell]

On 12/20/2013 08:15 PM, D C _Mac_ Macdonald wrote:
> Now all I have to do is to figure out where to get the 18-75 VDC to drive it!  How well do ARC-5 and SCR-274-N receivers work on 96V?
>   
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * Oklahoma City, OK *
> * USAF, Ret (61-81) *
> * * * * * * * * * * *
>
Hi Mac,

I have operated them on about 70 volts or so from a nine volt stack in 
series before. It was a go/no-go test with the seven batteries I had on 
hand at the time. Of course that was the B+ and I was pumping the full 
28 volts to the heaters. Some fellows have reported running them at 45 
volts with a series stack of 5 X 9 volt batteries but they said they had 
to change some resistors.

Operating them on lower B+ can avoid having to recap as the caps can 
hold up at the lower voltages. Somebody else said that and I haven't 
pushed anything to verify. Just something to consider. I have been 
playing with some homebrew stuff that runs tubes on the 45 volt battery 
stack but it is setup to run that way. We can't make any real power with 
very low B+. I wouldn't expect a lot of audio from a BC-453 with 45 
volts B+! Of course, I use Hi-Z cans anyway so that wouldn't matter.

And finally there are some guys who really push it hard and run with 12 
volts DC on the plates. I would expect to change quite a few details in 
a command receiver to get it to work under a limbo stick set THAT low.

Merry Christmas,

Bill  KU8H  aka  Santa Claus