Tube-number record
ML-7209
0 archive entries
ML-7209 is a tube type in the TubeDatabase archive (class: UHF Planar Triode). Recorded specifications: brand Machlett, year 1964, construction Triode, socket Coaxial, maximum plate voltage 15000 V, and maximum plate dissipation 25 W. The archive does not yet hold a photographed example of this type.
BrandMachlett
ClassUHF Planar Triode
BaseCoaxial
Filament6 V @ 1 mA
Construction
Primary TypeTriode
EnvelopeMetal-Ceramic
Sections1
Filament / Heater
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation25 W
Grid 1 Voltage-150 V
Cathode Current3000 mA
Audio Performance
Power Output2200 W
Key Features
- Low interelectrode capacitances
- High transconductance
- Rugged coaxial construction
- Forced-air cooled
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| General Test | 600 V | 25000 | — | 100 | 70 mA |
| Plate-Pulsed RF Oscillator (2.5 Gc) | 3500 V | — | — | — | 4000 mA |
| Frequency Doubler (1.2 Gc) | 3500 V | — | — | — | 1200 mA |
Application Notes
Designed for use as a grid- or plate-pulsed oscillator, switch tube, or frequency multiplier at frequencies up to 3 Gc.
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