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Was RE: magnetrons as diodes, now high power VT Diodes

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hello Jim, Et Al,

The previous post could not be passed up either.

I think I have posted before that my old (cold war) 3 phase Nikkie site
transformer for my work in progress 12" DC coil uses (6) 8020's in a stair
step arrangement of sockets and insulators for 6 pulse rectification.

I was planning on pulling the top and replacing it with a flat plate and
internal HV puck diodes - (saving the top in complete tact).

This tank would be nothing short of a spectacular and very functional
Frankenstein's monster with the original diodes.

Would you have 6 you would be willing to part with?

Jim Mora
Ojai, Ca.

Picture available on request.
My first college text book was, "Vacuum Tubes and Transistors"

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Saturday, January 06, 2007 4:20 PM
To: tesla@xxxxxxxxxx
Subject: Re: magnetrons as diodes

Original poster: HomerLea@xxxxxxx

I couldn't pass this one up. 40+ years I built a Cockroft-Walton
voltage multiplier using 8020 and 705A tubes. At one point testing it
the plates on the 8020s turned red so I thought "oops, better turn it
off". Nothing was damaged; don't get a second chance like that with
solid state. The tubes also make for a lot more interesting looking
device. I still have piles of the tubes so if I live long enough I
hope to construct another CW multiplier.
Jim Heagy, old fashion fan of tubes

In a message dated 1/5/2007 9:59:11 PM Pacific Standard Time,
tesla@xxxxxxxxxx writes:

>Might be a lot more robust than the semiconductor string.  One
>advantage of old standard rectifier tubes like the 8020A is that
>they'll tolerate oopsies a lot better than a string of 50 1n4007s.
>Given the basic design of the magnetron is as a moderate efficiency
>power oscillator, I'll bet it would handle the odd flashover or
>overcurrent or spike pretty well. The reverse voltage breakdown is
>probably in the 10 kV range, too. And, cheap to replace (as compared
>to the 8020As, which pretty pricey).