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Vacuum Tubes for Vintage Radios
(1920s & Early 1930s) Info for Newbies

 

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Some notes on 1920's tube numbers, types  and bases

Vacuum tube numbers were not standardized until the early 30's. At that time all the prefixes such as "UX". "UY" and other pre-fixes were dropped. Examples:

No. UX-201A became a "01A", a UY-227 became a "27" and so on.

An "A" suffix on tube number indicated an improvement over the previous version, either version will work.

Some early tube
 numbering examples

00A, same as UX200A
01A, same as UX-201A
301A, etc, same as 201A
C-11, same as WD-11
         WD-12
12A, same as UX-112A
71A, same as UX-171A
80, same as UX-280

 

 

early    battery    tube
basic   specifications:
 

UV/UX-200 (00)
gas filled triode detector
filament: 5 volts 1A tungsten

UV/UX-200A (00A)
gas filled triode detector
filament: 5 volts .25A throated

UV/UX-201 (01)
triode AF/RF amplifier
filament: 5 volts 1A tungsten

UV/UX-201A (01A)
triode AF/RF amplifier
filament: 5 volts .25A thoriated

UV/UX-199 (99)
triode AF/RF amplifier
filament: 3 volts .25A thoriated

WD-11
triode AF/RF amplifier
filament: 1.1 volts .25A coated filament, special base

WD-12
electrically the same as the WD-11 except for the "UV" base

More Comments

The standard #27 was originally designated as “UY-227” by most manufacturers, #45 was a “UX-245”. Some dropped the letter designations and simply went by 227 and 245 for the subject tubes.

The differences in the "ST" & "Antique Globe" style tubes are strictly cosmetic. The "Globe" styles are the early style & less common. They command a higher price because they look more authentic when peering into the insides of the 1920's radios.

Below are images of some of the early vacuum tubes

Click HERE if you wish to purchase vintage vacuum tubes
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