Tube-number record
201A/B
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BrandWestern Electric
ClassFilamentary detector, voltage amplifier triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeG18-1/2 Globe
Base MaterialNickel-silver (German silver)
SectionsSingle
Filament / Heater
MaterialNot specified
Absolute Maximum Ratings
Plate Voltage150 V
Grid 1 Voltage2.5 V
Audio Performance
Key Features
- Nickel-silver base
- Directly heated filament
- Globe shape envelope
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Voltage Amplifier | 130 V | 240 | 159000 | 38.1 | 0.24 mA |
| Voltage Amplifier | 130 V | 400 | 100000 | 39.8 | 0.56 mA |
Application Notes
The 201A tube is similar to the 102 tube except for grid construction. The 201A uses a Navy three-contact base with the fourth connection made to the bayonet pin shell. The 201B uses a standard four-pin base.
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