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Old 09-11-2012, 03:46 PM
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jr_tech jr_tech is offline
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@Username1....

The HV connection point can best be seen on the picture of the back of the tubes:



On the 4" and 2" CRTs the connection is on the right side of the funnel flare and in both cases located almost directly above the center of the deflection yoke. You should be able to see the HV button easily on the 4" tube, but it is more difficult to see on the 2" version.

On the 2.7 " tube, there is no funnel HV connection. Pin 1 of the CRT is somewhat isolated, and used for that purpose. Pin 1 is on the left side of the tube in the photo and if you look closely, you can see a small patch of white (rtv?) material used to provide insulation around the pin.

On the early 2" tube (ED-15), a black three pin connector juts out of the left side of the tube in the funnel flare region, providing connection for the 2 deflection plates and HV.

I'm guessing that HV was on the order of 1.5Kv on the smaller tubes and perhaps 3kv or so on the 4" tube, but this is only a WAG. The screens appear to be connected to the HV.

jr
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