Tube-number record
BI-DIRECTIONAL 12-WAY SELECTOR TUBE
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ClassCold Cathode Counting Tube
BaseDuodecal
Construction
Primary TypeOther / special
EnvelopeGlass
Base MaterialDuodecal with bottom cap and two flying leads
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage400 V
Cathode Current0.35 mA
Audio Performance
Key Features
- Bi-directional
- 12-way
- Visual indication through bulb dome
- Double pulse drive
- Integrated pulse drive
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Conditions | 191 V | — | — | — | 0.27 mA |
Application Notes
The required anode current may be obtained from a 475 V supply via a 910 kOhm resistor. Guide bias does not apply in the case of the sine wave drive.
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