Tube-number record
8CY7
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BrandTung-Sol
ClassDouble Triode
BaseNoval (B9A)
Filament7.9 V @ 646 mA
Construction
Primary TypeDual triode
EnvelopeGlass
Base MaterialSmall Button 9-Pin
Sections2
Filament / Heater
Warm-up Time11s
Absolute Maximum Ratings
Plate Voltage450 V
Plate Dissipation5.5 W
Grid 1 Voltage250 V
Cathode Current35 mA
H-C Voltage200 V
Audio Performance
Key Features
- Dissimilar Double Triode
- Coated Unipotential Cathode
- Combined Vertical-Deflection Oscillator and Amplifier
- Controlled Heater Warm-up Time
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Section 1 (Oscillator) | 250 V | 1300 | 52000 | 68 | 1.2 mA |
| Section 2 (Amplifier) | 150 V | 5400 | 920 | 5 | 30 mA |
Application Notes
Heater characteristics are controlled such that heater voltage surges during warm-up cycle are minimized when used with other similarly controlled types. Intended for use in 525-line, 30-frame television systems.
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