Tube-number record
AC/PEN
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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
Plate Voltage250 V
Plate Dissipation8 W
Grid 2 Voltage250 V
Audio Performance
Typical THD5%
Power Output3.3 W
Key Features
- Output Pentode
- Self-biased
- A.C. Mains
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.
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