Tube-number record
1.F.3.
0 archive entries
1.F.3. is a tube type in the TubeDatabase archive (class: Variable-Mu R.F. Pentode). Recorded specifications: brand Mazda, year 1948, construction Pentode, base Glass, socket Miniature 7-pin (B7G), and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.
BrandMazda
ClassVariable-Mu R.F. Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
SectionsSingle
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Cathode Current5.5 mA
Audio Performance
Key Features
- Directly heated
- Variable-Mu
- Battery operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Condition 1 | 45 V | 650 | 350000 | — | 1.6 mA |
| Condition 2 | 67.5 V | 950 | 250000 | — | 3.3 mA |
| Condition 3 | 90 V | 700 | 800000 | — | 1.7 mA |
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