[Milsurplus] Dynamotor Power Supply.

[David Stinson]

This is my SCR-274N  (HF Only configuration):
https://photos.app.goo.gl/un2hHT2vFDizxLLU8

This is the power supply that runs the 
entire set with no dynamotor problems (as long
as it has the two big "starter" caps on it:
https://photos.app.goo.gl/CuiW2Qmu14zKafW9A

It is made by Astec, two 24V at 15 amps which I 
"tweaked" to 26V.  Googled info on it.  
You have to use a small ribbon cable between the
two supplies to get them to load-share.
https://photos.app.goo.gl/5nzd88GhQoHRJJNk9

Each supply has a 100,000 uFd 30 VDC (40 surge)
"computer printer" cap across it for surges.
It starts all the 274N dynos all at once without
any trouble, but will not start the BC-375 dyno.
For that, I use a Astron 28V at 50 Amp with the
"battery charger" option across two lawn tractor
batteries, float charge set at 27V.  It does
the job well for the 375 and the ATD ( I think
the ATD would start with the 274N supply).

These ASTEC supplies show-up on Ebay from 
time to time.  Just have to keep an eye out.

GL OM ES 73 DE Dave AB5S

"You're always working at the margins
 of what you don't understand. 
That's the only exhilarating place to be. 
To just illustrate what you already know
 is condescending and a waste of your time."
--Emmet Godwin--