Antique radios, Old Time Radios
921
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Country:
United States of America (USA)
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| Identical to |
921
= GL921
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| First Source
(s) |
15.Jun.1948 : -- Original-techn. papers.
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| Filament |
--/-- |
| Description |
Cartridge type with a S-1 spectral response. Wavelength of maximum spectral response is 8000 +/- 1000 angstromes. This type makes use of a semicylindrical photocathode, and has a direct interelectrode capacitance of 1 picofarad. Anode-Supply voltage DC/peak AC is 90 volts.
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Dimensions (WHD)
incl. pins / tip |
23 x 44 x mm / 0.91 x 1.73 x inch |
| Weight |
11 g / 0.39 oz |
| Tube prices |
2 Tube prices (visible for members
only)
|
| Information source |
Taschenbuch zum Röhren-Codex 1948/49
- - Manufacturers Literature RCA Phototubes and Photocells PT-60
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921: RCA Phototubes 1941
David Erali
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921
Anonymous 15 Collector
More ...
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921: Manufacturer's Literature
Emilio Ciardiello
More ...
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2
Collection of
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