Tube-number record
8CM7
0 archive entries
8CM7 is a tube type in the TubeDatabase archive (class: Double Triode). Recorded specifications: brand Tung-Sol, year 1956, construction Dual triode, socket Noval (B9A), maximum plate voltage 500 V, and maximum plate dissipation 5.5 W. The archive does not yet hold a photographed example of this type.
BrandTung-Sol
ClassDouble Triode
BaseNoval (B9A)
Filament8.4 V @ 0.45 mA
Construction
Primary TypeDual triode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesControlled warm-up for series operation (450 mA series string)
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation5.5 W
Cathode Current70 mA
H-C Voltage200 V
Audio Performance
Key Features
- Dissimilar Triodes
- Vertical Deflection Amplifier
- Series Heater Operation
- Thermal Heater Control
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Unit 1 Oscillator | 200 V | 2000 | 10500 | 21 | 5 mA |
| Unit 2 Amplifier | 250 V | 4400 | 4100 | 18 | 20 mA |
Application Notes
Intended for use as a vertical deflection amplifier in 450 mA series heater operated television receivers.
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