Tube-number record

921

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BrandRCA

ClassGas Phototube

BaseCartridge

Construction

Primary TypeOther / special

EnvelopeCartridge

Base MaterialMetal/Glass

SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage90 V

Cathode Current0.003 mA

Audio Performance

Key Features

Cartridge type
S-1 response
Semicylindrical cathode
Any mounting position

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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