[GreenKeys] Tube powered loop supply

[John Nagle]

> One of my goals is to set up a completely tube (hollow state) RTTY station.
> Got the ASR 28 and TT/L-2 (Courtesy of Jack K0TTY), and am in the process of
> building a W2PAT AFSK device.
> 
> Now, I need to be aimed in the direction of a tube based loop powersupply
> circuit without any solid state rectifiers. I have googled extensively and
> have found nothing.

http://www.emissionlabs.com/datasheets/EML5U4G.htm
http://www.emissionlabs.com/datasheets/274.gif

You don't need to buy a 5U4 from them; there are cheaper sources.

http://thetubestore.com/5u4types.html

Realistically, a big semiconductor power diode behind a transformer isn't going
to blow from EMP.  The active volume is too big. The vulnerable gates are
in ICs or connected to wires of a meter or more in length.

					John Nagle