How can I tell if my Tubes can interchange?

ZPaul2Fresh8

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Tube 1 has screen burn. 25K7197

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Screen 2 possible donor. Unsure of chassis type, maybe 25K7401?

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Tube possible donor 25K7193

Can't be as simple as plugging in a neck board if it fits correct?

Thanks!
 
need to check the number of pins on the neck, g1, and heater voltage. will probably need to swap the yoke from the original chassis to the new tube if everything else matches.
 
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