25" Amplifone tube requirements?

Griffin

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What are the minimum requirements for an Amplifone Tube swap other than...

25" 4:3 tube
100 degree / V100 deflection
CR-23 neck
6.3 Heater

Are there any other critical non-usual specs? How about focus voltage which sits at 8.4Kv for the Amplifone/Zenith
 
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Mechanical fit. If you're putting one in a SW cockpit the less meddling the better.
I have a pair of rebuilt A63AAX02X tubes. They are identical to the original A63AAX00X except for the mounting ears.
But I'm told they will work as drop ins. Might be getting rid of one soon....
 
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