Tube-number record
CK6688 / CK6688A
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BrandRaytheon
ClassPentode
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypePentode
EnvelopeGlass T-6 1/2
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage210 V
Plate Dissipation2.7 W
Grid 2 Voltage175 V
Cathode Current25 mA
H-C Voltage60 V
Audio Performance
Key Features
- High transconductance
- Frame grid
- Sharp-cutoff
- Wide-band amplifier service
- Vibration and shock resistant
- Reliable quality
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Wide-band amplifier | 190 V | 16500 | 90000 | — | 13 mA |
Application Notes
Special attention should be given to the temperature which the tubes are to be operated. Reliability will be seriously impaired if maximum bulb temperature is exceeded.
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