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Is there a table or something that lists tube #s according to type? As near as I can tell there is not a direct systematic relationship between the type of valves within a tube and the tube designation #. I realize the correlation between the first # and the filament voltage, but beyond that things seem to be all over the map. Maybe there is a pattern and I haven't recognized it.
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The US system is not rigorous, but the scheme is:
First number indicating heater or filament voltage
Next one or more letters indicating type
Next a number indicating useful elements in tube
Fourth, letter indicating size or construction type
So like a 5Y3-G is:
5 volts heater
Y for rectifier
3 useful elements
G in a glass envelope
Or 50L6-GT is
50 volts heater
L beam power amp
6 useful elements
GT - small glass envelope
There are a lot of exeptions to these rules. Tube manual will help you out to specifically if you are looking for multi-purpose tubes like triode-pentode, triodr-triode, etc.
Also, after I wrote the above, I found the following:
Tube numbering -
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