Tube-number record
3RM/215G
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3RM/215G is a tube type in the TubeDatabase archive (class: Magnetically-beamed industrial triode). Recorded specifications: brand ITT, construction Triode, maximum plate voltage 6500 V, and maximum plate dissipation 8000 W. The archive does not yet hold a photographed example of this type.
BrandITT
ClassMagnetically-beamed industrial triode
Filament12.5 V @ 12 mA
Construction
Primary TypeTriode
EnvelopeMetal-Ceramic with Water Jacket
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated, matrix type cathode
Absolute Maximum Ratings
Plate Voltage6500 V
Plate Dissipation8000 W
Grid 1 Voltage-750 V
Cathode Current24000 mA
Audio Performance
Key Features
- Magnetically-beamed
- Field of a permanent magnet guides electron flow
- Solid 'gate' electrode replaces conventional grid
- Integral transverse flow water jacket
- Matrix type cathode
- Negligible gate dissipation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Industrial Heating Oscillator (Condition 1) | 2500 V | 40000 | 1050 | 42 | 4490 mA |
| Class C Industrial Heating Oscillator (Condition 3) | 4000 V | 40000 | 1050 | 42 | 5150 mA |
| Class C Industrial Heating Oscillator (Condition 5) | 6000 V | 40000 | 1050 | 42 | 5200 mA |
Application Notes
The tube may be used in r.f. amplifiers, oscillators and r.f. heating applications. Efficiency is good at low anode voltage due to low anode bottoming potential. Base cooling is not required below 1MHz.
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