Tube-number record
EF72
0 archive entries
EF72 is a tube type in the TubeDatabase archive (class: Subminiature R.F. Pentode). Recorded specifications: brand Mullard, construction Pentode, socket B8D / B8F, maximum plate voltage 175 V, and maximum plate dissipation 0.8 W. The archive does not yet hold a photographed example of this type.
BrandMullard
ClassSubminiature R.F. Pentode
BaseB8D / B8F
Filament6.3 V @ 150 mA
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 Voltage
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode connected | 100 V | 5000 | 250000 | 36 | 7 mA |
| Triode connected | 100 V | 6800 | 5300 | 36 | 9.2 mA |
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.
Datasheets
Datasheet: EF72.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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