Antique radios, Old Time Radios
EF8
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Country:
Netherlands
|
|
| Identical to |
EF8
= CV1123
= VR123
= CV1713
= VT164_GPO
|
| Similar
Tubes |
Other class quality (otherwise equal):
4693
Other base:
EF22_9pin
; EF38
; EF8G
Other base and other heater:
UF8
Multiple differences or of other kind:
EF13
|
| First year |
Apr.1938
Tube leaflet collection E.Erb Analysis by original leaflets
|
| First Source
(s) |
May.1938 : Philips Bulletin
Mar.1938 : Daten und Schaltungen moderner ... Röhren; Philips
|
|
Successor Tubes
|
EF22_9pin
|
| Base |
Europe side contact P8A (Au P, 8SC) (Codex=Sa)
Top contact with a cap.
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC |
| Description |
Low noise HF preamp tube.
Descibed in Mullard literature of 1938 as an RF pentode. The additional grid introduces a beam formation into the electron stream so that the electrons can pass between the wires of the screen grid without striking them. This reduces the screen current and imprves the S/N ratio.
Text in other
languages (may
differ)
|
| Tube prices |
3 Tube prices (visible for members
only)
|
| Information source |
Babani, International Radio Tube Encyclopaedia Pages 104 &105
Taschenbuch zum Röhren-Codex 1948/49
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
|
EF8: Röhrenkartei Drenkelfort
Peter Hoddow
More ...
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EF8: RTT 1974 (Franzis) 13. Auflage
Martin Renz
More ...
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Just Qvigstad
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EF8: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
More ...
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):376
Collection of
Collection of a member from D |
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