Tube-number record
AC/S2 PEN
0 archive entries
AC/S2 PEN is a tube type in the TubeDatabase archive (class: H.F. Pentode). Recorded specifications: brand Ediswan Mazda, construction Pentode, socket 7-pin (non-miniature), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandEdiswan Mazda
ClassH.F. Pentode
Base7-pin (non-miniature)
Filament4 V @ 1000 mA
Construction
Primary TypePentode
EnvelopeMetallised bulb
SectionsSingle
Filament / Heater
Heater NotesA.C. Mains
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. Pentode (Rating) | 200 V | 5800 | — | — | — |
| Frequency Changer with Cathode Injection | 250 V | 1700 | — | — | 4.5 mA |
Application Notes
The valve is suitable as a self-oscillating frequency changer with cathode injection. Requires approx 2 turns in cathode coil on medium waves. Screen voltage may be obtained via 150,000 Ohms resistor. Self-bias resistance of 1,000 Ohms recommended.
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