Quote:
Originally Posted by Eric H
It is a model 622, my spare tube is a 14QP4, not compatible.
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If you have to use your QP4, you could remove the focus coil and hook the focus element (pin 6) to somewhere around 300 volts (not very critical) or even just strap it to G2 which is pin 10. Use a single ion trap... should work fine.
jr