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I just know that the 21aup4a in the stromberg carlson x-21 needs the 400+ boost st stay focused through the brightness range, anything else, it blurs.
Until last night, while using the CRT as a test subject for the Arvin chassis, the focus pin was unhooked and floating, but when I did, as mentioned, it took 400v to make the tube happy as before.
I will just have to wait and see till I drag the Arvin chassis dowstairs to where the 21fp4c is waiting to see if it will be happy with the same voltage or not.
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