Is it 90 degree or 100 degree

Cashdog

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My tube has an embossed 80 on it.

Is an RCA A48AAB

How do you know if it is 90 or 100?

Read other thread but they had embossed 90 or 100 on the tube
 

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If it's not actually marked in the glass, I don't know if there's a way to determine it just from the part number. But you can always eyeball it: stick it next to a 90 degree tube and compare them. The 100 degree tube will be stubbier front to back, not just the neck but the entire tube.
 
as a rule they would emboss the glass
but it would read 100 or 110,rule of thumb is the smaller the tube distance back of neck to front the steeper the angle. ie 100/110

ed
 
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