Greetings again fellow listers - I have been trying to build a voltage multiplier to replace what I believe to be a dead one in my 5062C ion pump power supply. I downloaded the 5061service manual (thanks Leapsecond!!), and it states that it is a doubler in that power supply. I long ago got rid of my HV parts stock at a ham swap foolishly thinking that I wouldn't be needing them, so I had to pay $6 each for a couple of NTE 2Kv PIV diodes at the local parts house. I decided that HP might have used Greinacher type doubler and put one together using some 2Kv rated .01uf ceramic caps. What I got out of it when hooked up to the ion pump ps was about 1.77Kv AC according to my Fluke 8060 and high voltage divider probe. So I guess I am not quite there yet and would appreciate more guidance in that area. I did get a Bertan 5Kv adjustable PS off ebay as a plan "B" if I can't fix the original supply. I also tried to dissolve the potting material on the defective module, but sitting in xylol for 2 days hasn't done anything. Also, I was wondering if Cs tubes could be stored for long periods (say 10-20 years) as long as the ion pump was kept active or at least at regular intervals. I was wondering what the failure modes might be - air leakage, or does the cesium sublimate over time out of the oven? Also, is anybody able to rebuild Cs tubes? Again, I am wondering if I would be able to find a replacement down the road for the compact tube in the 5062. Thanks again! tim
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