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Should I try the medium or high settings ?
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- only as a last resort.
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How long should I zap it for ?
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- no more than 1 second.
I prefer letting the tube cook at a slightly higher filament voltage for a few minutes rather than use the Intensifier. Especially if it's been sitting for years.
Do you have the manual for the 400? Here's an excerpt:
You should set the Selector switch to the Dynamic Intensifier-Lo position. Wait 15 seconds. Press the Dynamic Intensifier button momentarily. (Caution: Do not hold down the button over 1 second.) After the tube has been rejuvenated in this position, turn to Emission position on the Selector switch and check the emission again....
If the emission is over 300 you have completed the rejuvenation. One the tube has been rejuvenated, do not try to get more out of the tube by rejuvenating it again as you may destroy the cathode surface...
If the emission does not read 300 or better, try the Med position....
If the emission does not read 300 or better, try the Hi position....
If you cannot bring the emission current up by using the Hi position, the tube cannot be repaired and no attempt should be made to do any more to that tube
