A xray tranny for sale

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3l
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A xray tranny for sale

Post by 3l »

Hi Guys:

On ebay just saw this brand new 90lb
150 kv @300 ma never been oiled.
Ebay item# 2549958780

If I hadn't just bought a light weight dental xray I would have bid!
Could be the thing!
Go get em guys!
Bring cash!

Happy Fusoring!
Larry Leins
Fusor Tech
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Carl Willis
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Re: A xray tranny for sale

Post by Carl Willis »

This would be an EXCELLENT fusor supply transformer, and I can say that based on my experience with a unit of substantially the same ratings and appearance. Mine, of course, was already submerged in a tank with Diala oil or somesuch and a big solid-state bridge rectifier and filament transformers.

I hope someone on the list is able to bring home this bad boy, on account of the number of people on the group who are limited from doing fusion solely on the basis of lacking a solid power supply.

If you were to turn this transformer into a fusor supply, you'd want to get it a bridge or at least full-wave HV rectifier assembly which I've seen on eBay on several occasions. It is probably best run from 220 V single phase AC through a big variac. MUST be under oil before juicing it up. Since it is center-tapped, you'd be able to push it up to about -75 kV for the cathode. I've described much earlier here my "magamp" or saturable-core inductor method for easily limiting the power (watts) delivered on my x-ray machine. The primary variac controls voltage delivered.

This is not my auction, but I'm singing its praises here because it offers a key part for getting into the Neutron Club and seeing more like it on eBay might take a long time.

-Carl
Carl Willis
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Brian McDermott
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Re: A xray tranny for sale

Post by Brian McDermott »

Although it runs on 240 volts for max power, could you use a 120 volt variac to drive this transformer on reduced power? What kind of current rating would you need on the variac? Also, I'd imagine you'd need a pretty hefty cable to connect this to the fusor.

Brian
3l
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Re: A xray tranny for sale

Post by 3l »

Hi Brian:

Just off the top of the old noodle:

150kv = 1.5 x 10^4 Volts
300 ma = .3 Amp

Total watts = (1.5 x 10^4volts) (.3 amps)= 4.5 x 10 ^3 Watts or 4.5 KW
You're in luck a house mains can deliver 22 KW on a 100 Amp breaker box or 44 kw on a 200 Amp breaker box.
Total Amps needed for your variac= 4.5 x 10^3 Watts / 2.20 x 10^2= 2.05 x 10^ 1 amps or 220 Volt dual @ 20 Amp variac
Yeah you could do 10 Amp on each leg but I'm conservative on safety.
If your juice runs 10 cents a kw/hr every hour you will rackup
45 cents worth of electricity with this rig.

PS 220 is standard house working voltage 240 is not.

Happy Fusoring!
Larry Leins
Fusor Tech
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Richard Hull
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Re: A xray tranny for sale

Post by Richard Hull »

I think you would never ever hit 300ma.

I would figure on less than a kilowatt.

You will get about 1/2 the output voltage running on 120 volts. Assuming you have a normal transformer rectifier setup and not a switching supply.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
ningauble
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Re: A xray tranny for sale

Post by ningauble »

Some X-Ray supplies I have seen (used to repair em) tend to
be as optimistically rated as neon sign tranny's. This is mainly
due to the very short duty cycle use demanded of them. My
Tanaka unit that I scored the variac from has a 240V 12A input
(2880 VA) to give a max 60KV @ 60 mA output (3600 VA !!!).
All with a one second per minute duty cycle.

Thats an amazing 125% efficiency, something I haven't seen
since I was measuring power in a homemade switchmode with a
cheap digital multimeter.
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