HV module for use with 7JP4?

[Eric H]

Emco makes a HV module that can be used to replace the defective Philco HV supply but they are bloody expensive!

http://www.emcohighvoltage.com/

[Eric H]

Tom, here's the page with the information on the replacement module.

http://www.myvintagetv.com/philco_hv.htm

[Phil Nelson]

Have you ever talked to John Folsom about possibly replicating this with his super-duper coil winding machine? Knowing nothing about coils, I don't know whether it would be easy or hard . . . .

Phil Nelson

[Findm-Keepm]

Surplus Sales of Nebraska has some.

We used to cannibalize Conrac monitors for the HV supply module - and it was variable! Something like 9-17 KV with 24 volt input, and about 1.5" x 3" x 6" in size. Output was to a female plug attached to HV wire.

Cheers,

[wa2ise]

Originally Posted by Findm-Keepm

We used to cannibalize Conrac monitors for the HV supply module - and it was variable! Something like 9-17 KV with 24 volt input, and about 1.5" x 3" x 6" in size. Output was to a female plug attached to HV wire.

Back in 1979 I used to work for some toilet of a company that made boxes to convert video to hard copy on Xray film. Customers were hospitals and clinics that had CAT scanners, and they were used to using Xray film for image storage, so our box had a video monitor inside, and a lens and Xray film holder to expose. The monitors were ones intended for security camera work, or pay extra and get our box with a Conrac monitor. The QQA was multisync (long before VGA!), and used those HV modules. We swapped the CRT for a smaller but flat 5 incher. We considered using different HV modules, but the chief engineer said the excessive HV will just make for sharper spot size, and as it's inside our box, Xrays from the CRT was not an issue. Not enough to fog the film after going thru the lens it seems.

The boss there turned out to be the 2nd worst manager of my life, knocked from 1st place by some idiot boss I had at Bell Labs.

[leadlike]

wa2ise, I remember seeing such a machine in the hospital that I worked at! Basically, you stuck a big piece of sheet film into a lower drawer that contained a crt. You were essentially making a 1:1 contact print directly onto the film. You watched the action on a live monitor that sat atop the exposure unit.

The Doc saw me reading through the manual in the break room, and commented with something like "oh yeah, that thing was a real waste of money."

Not sure if the machine used x-ray film or not, but at the time I was using x-ray film in my view cameras because I could get it from the hospital for cheap, so it certainly was sensitive to light well into the visible spectrum.