Tube-number record
AC/PEN
0 archive entries
AC/PEN is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Mazda, construction Pentode, base Plastic or Phenolic, socket 7-pin (non-miniature), maximum plate voltage 250 V, and maximum plate dissipation 8 W. The archive does not yet hold a photographed example of this type.
BrandMazda
ClassOutput Pentode
Base7-pin (non-miniature)
Filament4 V @ 1 mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialPlastic or Phenolic
Sections1
Filament / Heater
Heater NotesA.C. Mains
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 200 V | 2500 | — | — | 24 mA |
| Class A | 250 V | 2500 | — | — | 32 mA |
Application Notes
The valve should always be self-biased, and the bias resistance by-passed by a 50 mfd. condenser. In order to prevent excessive rise of anode load with frequency a condenser resistance filter should be connected across the anode load circuit. The condenser should have a capacity of 0.01 mfd. and the resistance should be about 7,500 Ohms. The grid to cathode resistance should not exceed 1 megohm.
0 results