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Re: 01a tubes

01A's generally refer to the "ST" shaped bulbs

201A/301A/401A are generally globe, the first letter is irrelevant, for example RCA is 201, Cunningham 301, Deforest 401 etc.

UV refer to the short pin types
UX refer to the long pin (like a 45 or 2A3) type

There is also a 201 (non-A) with higher current requirements

The globe types come as BBT (brass base, tipped), BB (brass base, no tip) and bakelite bases. There are literally hundreds of manufacturers that made 201's.



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