Tube-number record
3B/505E
0 archive entries
3B/505E is a tube type in the TubeDatabase archive (class: R.F. Triode). Recorded specifications: brand STC, construction Triode, socket Special / none, maximum plate voltage 1500 V, and maximum plate dissipation 50 W. The archive does not yet hold a photographed example of this type.
BrandSTC
ClassR.F. Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage1500 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Characteristics | 500 V | 3750 | 12000 | 45 | 100 mA |
| Class B Telephony (Modulated Carrier) | 1500 V | — | — | — | 50 mA |
| Class C Power Amplifier (Anode Modulated) | 1250 V | — | — | — |
Application Notes
The valve should be operated in a vertical position and a free circulation of air must be provided to ensure adequate cooling of the bulb.
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