Advice on electrostatic deflection CRT ?

From: <(>
Date: Wed Jan 21 13:27:26 2004

forgive any inaccuracies to those who may know better (or can remember

what you will be interested in finding out is the deflection per inch
voltage required for the beam deflection. I seem to remember ranges of
10-50 volts per inch. You will need to know the filament voltage of course
and its amperage. What I don't recall is what the necessary acceleration
element voltages were. The grid was used to control the beam brightness
with a greater negative voltage with regards to the other elements dimming
the beam (I think). The electrostatic plates should have the beam in center
with zero volts and then deflection is accomplished by positive and
negative voltages. If you can not find precise data then you can find the
full deflection voltage by experiment once you have a center beam. I
suspect that the long tube should give you a more sensitive tube in that
the deflection voltage may be on the low end of the range.

best regards, Steve Thatcher

Original Message:
From: Tom Uban
Date: Wed, 21 Jan 2004 09:50:46 -0600
Subject: Advice on electrostatic deflection CRT ?


I have what I believe is a custom CRT. It has a 12" round face, is
approximately 20" long, and uses electrostatic deflection. It was
manufactured by Thomas Electronics Inc. in Wayne NJ and is hand
marked as model number 12E35P31, 12-2-78.

I am hoping to put this CRT into service and need to come up with a
set of specifications which will likely work with it. What other
physical information do I need to take from the CRT in order to
help determine the specifications?

Any suggestions for creating the power supply and deflection drive
electronics are welcome.



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Received on Wed Jan 21 2004 - 13:27:26 GMT

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