Tube-number record
GC 12/4B
0 archive entries
GC 12/4B is a tube type in the TubeDatabase archive (class: Bi-directional 12-way Computing Tube). Recorded specifications: construction Other / special and socket Octal. The archive does not yet hold a photographed example of this type.
ClassBi-directional 12-way Computing Tube
BaseOctal
Construction
Primary TypeOther / special
EnvelopeGlass
Sections12-way
Filament / Heater
Absolute Maximum Ratings
Cathode Current0.55 mA
Audio Performance
Key Features
- Bi-directional
- Intermediate Outputs
- 12-way computing
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Conditions | 475 V | — | 820000 | — | 0.31 mA |
Application Notes
The required anode current may be obtained from a 475 V supply via an 820 kOhm resistor. Cathode B is aligned with pin No. 6 to an accuracy of +/- 10 degrees.
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