Tube-number record
AC/SP3/RH
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BrandEdiswan
ClassLow Noise H.F. Pentode
Base7-pin (non-miniature)
Filament4 V @ 1000 mA
Construction
Primary TypePentode
EnvelopeMetallised
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated; parallel operation
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Key Features
- Low noise
- High slope
- Low microphony
- Metallised bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. Amplifier | 250 V | 7000 | 550000 | — | 7.8 mA |
| H.F. Amplifier | 250 V | 7000 | 550000 | — | 7.9 mA |
| H.F. Amplifier | 250 V | 7450 | 400000 | — | 10.5 mA |
| H.F. Amplifier | 250 V | 7600 | 340000 | — | 12.3 mA |
| Resistance Capacity Coupled Amplifier | 250 V | — | — | — | — |
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