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Should work. If Focus is a little soft, you might try connecting focus electrode to a voltage less than g2 (spec for 21cbp4 is 123V, 21cbp4a is 225v when g2=300V) but I don't think it is very critical. Focus coil is no longer needed, of course, and the tube does not use an ion trap magnet.
jr
Last edited by jr_tech; 10-27-2009 at 06:11 PM.
Reason: add both tube types
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