EF72
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BrandMullard
ClassSubminiature R.F. Pentode
BaseB8D/F
Filament6.3V @ 150mA
Construction
Primary TypePentode
EnvelopeGlass Subminiature
SectionsSingle
Filament / Heater
Heater NotesDirect soldered connections to the lead of this valve must be at least 5mm from the seal
Absolute Maximum Ratings
Plate Voltage175 V
Plate Dissipation0.8 W
Grid 2 Voltage175 V
Grid 1 Voltage-1.3 V
Cathode Current12 mA
H-C Voltage100 V
Audio Performance
Key Features
- High slope r.f. pentode
- Subminiature
- Directly soldered leads
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode connected | 100V | 5000 | 250000 | 36 | 7mA |
| Triode connected | 100V | 6800 | 5300 | 36 | 9.2mA |
Application Notes
In operation this valve may become very hot and therefore it should be adequately cooled. A suitable method is to mount the valve in a metal clip which conducts heat away to the chassis.
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