Tube-number record
12AZ7
0 archive entries
12AZ7 is a tube type in the TubeDatabase archive (class: Double Triode). Recorded specifications: brand TUNG-SOL, year 1959, construction Dual triode, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassDouble Triode
BaseNoval (B9A)
Filament6.3 V @ 450 mA
Construction
Primary TypeDual triode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesSeries or Parallel operation; AC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Condition 1) | 100 V | 4000 | 15000 | 60 | 3.7 mA |
| Class A Amplifier (Condition 2) | 250 V | 5500 | 10900 | 60 | 10 mA |
Application Notes
For 12.6 volt operation apply heater voltage between pins #4 and #5. For 6.3 volt operation apply heater voltage between pin #9 and pins #4 and #5 connected together.
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