 |
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| Identical to |
EF50
= VT-250
= Z90
= VR91
= 10E/92
= ARP35
= ZA3058
= CV1091
= CV1578
= 63-SPT
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| First Series |
1939 Tube leaflet collection E.Erb Philips-Book [178] Archive = 1939 |
| First Source
(s) |
Oct.1939 : -- Original-techn. papers.
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| Predecessor Tubes |
4673
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| Successor Tubes |
1948
EF42
EF80
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| Base |
Loctal-9-Pin (B9G) (Codex=Y)
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| Filament |
-: Indirect /
-: Parallel / series AC/DC /
If: 0.3 Ampere /
Vf 6.3 Volts /
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| Tube prices |
0 Tube prices (visible for members
only)
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| Literature |
Taschenbuch zum Röhren-Codex 1948/49
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Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus
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Courtesy Thomas Rapp, roehren-museum.de
Olaf Toenne
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| Variants |
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RTT 1974 (Franzis) 13. Auflage
Martin Renz
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SEL Handbuch 1964
Peter Hoddow
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Variants |
Wireless World
Jacob Roschy |
EF50*original-versionas all glass valve yet without aluminium can, but with hooked pins, in order to plug-in and twist the valve by the bayonet-lock principle, which has been abandoned in the later EF50s mass production. 17.Mar.2006 Jacob Roschy |
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| Further Information for |
EF50 |
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EF50 (EF50)
(16.03.2006) Jacob Roschy
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Clicks: 410 Replies: 0 |
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The VALVE development continues rapidly and concerns both the characteristics and method of construction. A new Mullard type of valve of exceedingly unorthodox construction is described in this article.
development of the technique of radio valve manufacture was assisted in the early stages by the experience gained in the product ion of incandescent lamps. Although originally developed for the lamp, the glass bulb and foot, with its pinch, were adopted for the vacuum-tight envelope of the valve. Recent receiver development, however, has raised Problems which are difficult of solution with the existing valve technique. This is especially so in the case of short-wave and television apparatus.
THE
Some of the difficulties encountered in the original method of construction is developed from incandescent-lamp manufacture, can be summarised as follows:
(1) In certain valves of the old construction it was found necessary to connect anode and control grid to the opposite ends of the valve, which sometimes complicates receiver design.
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Original EF50?
(12.03.2006) John Turrill
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Clicks: 781 Replies: 10 |
Dear members, I wonder if anyone has more information on what I believe was the original version of the EF50 vhf pentode, which I'm told had a metallised coating (not the aluminium can of later versions) and L-shaped pins, so that the valve had to be pushed in and twisted to lock? (1939?) I'm told there were problems with side pressure on the pins cracking the glass, but I wonder how many were produced? A good photograph or information on the whereabouts of one would be most welcome! Regards from John.
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