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There are basically only three test CRTs
5AXP4 is for the earliest sets with a round CRT, low deflection angle and big 12 pin base.
Next came the 8XP4. It is for the 50s rectangular CRTs with 70 or 90 degree deflection and big 12 pin base.
Finally, the 8YP4. It's for the newer rectangular CRTs with 110 degree deflection and small base.
All are 6.3 volt, 0.6 amp filaments. Auto focusing and no ion trap magnet required
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