Tube-number record
TB2.5/300
0 archive entries
TB2.5/300 is a tube type in the TubeDatabase archive (class: RF Power Triode). Recorded specifications: brand Philips, construction Triode, socket 5-pin, maximum plate voltage 2500 V, and maximum plate dissipation 135 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassRF Power Triode
Base5-pin
Construction
Primary TypeTriode
Envelopeglass
Sectionssingle
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage2500 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Class C Telegraphy | 2500 V | 2800 | — | 25 | 205 mA |
| RF Class B Telephony | 2500 V | 2800 | — | 25 | 77 mA |
| AF Class B Amplifier (2 tubes) | 2500 V | 2800 | — | 25 | 178 mA |
Application Notes
It is necessary to direct a low-velocity air flow to the bottom and the top seal if the tube is used at or near the limiting values at frequencies above 50 MHz.
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