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Jordan:
I just checked and tube that is in the Hoffman is a 21YP4. I do not think that subs your tube as this one has electrostatic focus and not magnetic. I think the tube size is the same and I never tried putting a focus coil on an electrostatically focused tube.
Let me know if you think it will work. If Charles has the correct one let me know when you come up to this area.
Steve
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