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Old 13th Sep 2011, 7:44 pm   #111
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 4,159
Default Re: Restorers dream part 2 the chassis.

If the U25 was shorted it would drag down the pulse on the anode severely and a shorted visconol would also drag down the anode's pulse and cause the U25 to glow blueish/purple. A quick check would be to remove the CRT EHT cap disconnect the EHT lead from the U25 and connect a jumper lead fron the U25 to CRT anode cap this would remove both metrosil and visconol cap.
Remember its possible the ion trap has been disturbed.

Shorting the CRT's G1 & Cathode together will up the beam current enough to give you a bright raster.
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