Re: [TCML] Looking for a transformer, 30kV - 50kV

[Hypatia's Protégé <hypatia@xxxxxxxxxxxxxxxxxxx>]

Hi, Jeff!

An anode supply transformer (radiological trade talk='generator') salvaged from
a mammography system would seem to meet your requirements to the proverbial
'tee' --- Such devices are notably 'EMF agile (i.e. core saturation/lossiness
not an issue)  from typically 35 kVP through 55 kVP (~25 kV RMS thru ~46 kV
RMS) --- A few considerations though;

1) The available current will (in most instances) be considerably greater (150
mA to 600 mA) -- If this is a problem merely place an appropriate 'ballast
inductance' in series with the primary.

2) Such transformers must be operated under dielectric oil (Radiographic devices
seldom employed chlorinated compounds -- moreover any device manufactured
subsequent to July 3 1979 has the EPA's automatic blessing :)

3) It is advisable to remove the rectifiers (no great feat however it is
imperative that reinstillation of the oil is preformed in such a manner that
formation of air bubbles/pockets is avoided --- IMO It is advisable, when the
existing oil must be drained, to replace it with new  ("Shell DIALA AX" being my
preference). As you are no-doubt aware, where high EMFs are concerned,
cleanliness is everything!!! :)

Note: it is important that you locate a mammography transformer -- other
(medical) x-ray devices use much higher EMF's (80 -- 150+ kVP).  As non--medical
technologies go diffractometry uses relatively low energy (not to be confused
with power!) systems -- worth a look if the opportunity presents itself...

Hope to have been of some assistance
Best regards
Dan
----- Original Message -----
From: Jeff Behary
To: tesla@xxxxxxxxxx
Sent: Monday, February 18, 2008 8:51 PM
Subject: [TCML] Looking for a transformer, 30kV - 50kV



Hello all,

I'm looking for a transformer, somewhere around 30kV-50kV at 5 - 20mA or so.
Must be a core and coil transformer.  Strange request, I know!

Jeff Behary
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