250TH
0 Tubes in archive
BrandEIMAC
ClassHigh-Mu Power Triode
BaseSpecial 4-pin (National No. XM-50 or E.F. Johnson No. 123-211)
Construction
Primary Typetriode
Envelopeglass
Sectionssingle
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation250 W
Cathode Current350 mA
Audio Performance
Power Output1180 W
Key Features
- High-mu triode
- Thoriated tungsten filament
- Vertical mounting
- Convection and radiation cooling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Radio Frequency Power Amplifier Class-C Telegraphy | 2000V | 5600 | - | 37 | 357mA |
| Radio Frequency Power Amplifier Class-C Telegraphy | 3000V | 5600 | - | 37 | 333mA |
| Radio Frequency Power Amplifier Class-C Telegraphy | 4000V | 5600 | - | 37 | 313mA |
| Audio Frequency Power Amplifier Class-AB2 (Two Tubes) | 1500V | - | 4200 | - | 700mA |
| Audio Frequency Power Amplifier Class-AB2 (Two Tubes) | 2000V | - | 6000 | - | 700mA |
| Audio Frequency Power Amplifier Class-AB2 (Two Tubes) | 3000V | - | 12200 | - | 560mA |
Application Notes
Intended for use as an amplifier, oscillator or modulator. The plates of the 250TH operate at a visibly red color at the maximum rated dissipation of 250 watts.
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