Tube-number record
921
0 archive entries
921 is a tube type in the TubeDatabase archive (class: Gas Phototube). Recorded specifications: brand RCA, year 1956, construction Other / special, base Metal/Glass, socket Cartridge, and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassGas Phototube
BaseCartridge
Construction
Primary TypeOther / special
EnvelopeCartridge
Base MaterialMetal/Glass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage90 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Luminous Sensitivity | 90 V | — | 1000000 | — | 0.135 mA |
Application Notes
DC Load Resistance: 0.1 Megohm minimum for 70V supply, 2.5 Megohm minimum for 90V supply with currents above 2uA. Average current may be doubled when anode-supply voltage is limited to 70 volts.
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