Tube-number record
1AM4/1T4-SF
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BrandRETMA
ClassRF Remote Cutoff Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeT-5 1/2
SectionsSingle
Filament / Heater
MaterialCoated
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Cathode Current5.5 mA
Audio Performance
Key Features
- Remote Cut-off
- Internal Shield
- Directly Heated Cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 90 V | 900 | 500000 | — | 3.5 mA |
Application Notes
RF Remote Cutoff Pentode designed for portable receiver applications.
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