[ARC5] UPS Transformers

[Kenneth G. Gordon]

On 19 Nov 2015 at 6:17, Fuqua, Bill L wrote:

>    I miss the availability of the nice TV transformers I used to use for 
> HV transformers for my projects.

Boy! Me too!!!!! I have managed to gather together a few of those, but wish I 
had more.

> With a voltage doubler got 1100 to 1200 volts
> B+ Used one to power my 4x 6AG7 grounded grid amplifier. I want to reconstruct
> it some day just for the fun of it.

Yes. I did things in my youth which I would like to recreate mainly to see just 
how much I DIDN'T know at the time, and what the true results were, vs what 
I thought at the time.

For instance, I modified two BC-610s for use as linear amps, replacing the 
250TH with first one, then two 304TLs, installing a shunt regulator circuit 
taken from a Wilcox 96A, running the 304TLs in Class B, and achieving a 
measured output of 2600 watts...for a few seconds at a time, anyway. The 
plates on the 304TL would turn white-hot, so we didn't hold the key down 
very long when testing and/or loading up. Didn't seem to hurt the tubes, 
though.

I and Bob Preston W7DPG used them for AFMARS phone-patching into 
SEA.

I would like to find out just how bad the IMD, distortion and possible splatter 
there was. No one complained, but  we were pretty far away from any ham 
band.

These days, I understand that IMD with a 304TL can't be much better than 
about -30 dB at best. Wouldn't be acceptable on today's ham bands.

Ken W7EKB