Tube-number record
12K7
0 archive entries
12K7 is a tube type in the TubeDatabase archive (class: Pentode Voltage Amplifier). Recorded specifications: brand National Union, construction Pentode, socket 8-pin, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandNational Union
ClassPentode Voltage Amplifier
Base8-pin
Filament12.6 V @ 150 mA
Construction
Primary TypePentode
EnvelopeMetal
SectionsSingle
Filament / Heater
Heater NotesIndirectly-heated Cathode
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation 1 | 100 V | 1450 | 800000 | 1160 | 7 mA |
| Typical Operation 2 | 250 V | 1650 | 500000 | 830 | 10.8 mA |
Application Notes
Class A Amplifier
0 results