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I should have done this first.
My Sylvania Characteristics of Cathode Ray Tubes from 1959 shows a coating capacitance of 500 uuf min. to 2500 uuf max. for a 10BP4. It wants 750 – 3000 for a 12LP4.
I got out the old Heathkit IT-11 cap checker. I measured from the 2nd anode button to the outer coating of my freshly Slip-Plate coated neckless 10BP4
The reading was 900 uuf.
The reading on my new RCA 12KP4 is 1100. The Sylvania reference is 500 – 2500 for the 12KP4.
How thick is the Slip-Plate coating that I sprayed on? It was enough so that I could no longer see the glass underneath.
Would someone care to confirm these results for us?
Roger
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