Tube-number record
8628
0 archive entries
8628 is a tube type in the TubeDatabase archive (class: High-Mu Triode). Recorded specifications: brand RCA, year 1965, construction Triode, base Ceramic, socket Subminiature, maximum plate voltage 250 V, and maximum plate dissipation 0.3 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassHigh-Mu Triode
BaseSubminiature
Filament6.3 V @ 100 mA
Construction
Primary TypeTriode
EnvelopeMT4
Base MaterialCeramic
SectionsSingle
Filament / Heater
Heater NotesDC or AC
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation0.3 W
Grid 1 Voltage-55 V
Cathode Current2 mA
H-C Voltage100 V
Audio Performance
Key Features
- Nuvistor type
- Small signal amplification
- High input impedance
- Low noise
- High-mu
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 120 V | 3100 | 41000 | 127 | 1.5 mA |
| Cathode-Follower | 150 V | — | — | — | 0.3 mA |
Application Notes
Specifically designed for condenser-microphone preamplifiers, piezoelectric- and ceramic-pickup preamplifiers, and other applications requiring amplification of extremely small signals from DC to 200 kc/s.
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