22 Tube
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Normally replaceable-slightly different:
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 45
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[rmxtube-en]
According to Tyne on page 318, extensive experimental work was done at GE during 1924 and 1925 and in July 1926 samples were submitted to RCA, which assigned the type UX222 in November 1926. Production was started at Nela Park and the UX222 was announced by RCA in October 1927. The thoriated filament takes 0.132 ampere at 3.3 volts. The maximum recommended anode voltage is 135 volts and with +45 volts on the screen grid and -1.5 volts on the inner grid it is resulting 1.5 milliampere anode curent. Amplification factor is then 300 and the mutual conductance 350 micromhos.
Only the UY227 from Westinghouse was some months earlier as first screen grid tube for (battery) radios in the USA. The first AC screen grid tube, the UY224, followed in 1929. Those three types were getting rid of neutralization to be necessary.
22
= RF22
= 222
= 38002
= VT-26
= PH222
= OK-X-222
= CX322
= 422
= SX222
= NU-22
Oct.1927
Saga of the Vacuum Tube, Tyne page 318 + Tube brochures collection E.Erb
UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bu)
Top contact with a cap.
Vf 3 Volts / If 0.13 Ampere / Direct / Battery =
1 Tube prices (visible for members
only)
Essential Characteristics, GE 1973
Taschenbuch zum Röhren-Codex 1948/49
22: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
22: Cunningham Radiotron Manual
Peter Hoddow
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Feb.1941 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 616
You reach this tube or valve page from a search
after clicking the "tubes" tab or by clicking a tube
on a radio model page. You will find thousands
of tubes or valves with interesting links. You
even can look up radio models with a certain tube
line up.
[rmxtube-en]
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The Philips 21- "Key Base" tubes were initially designed in 1940 with the 9-pin base B9G like the EF50. The later series production from 1942 on however was changed to the 8-pin Locktal-base B8G designed by Sylvania.
Vacuum Pentode RF/IF-Stage Controlling (mu)
EF22
= W143
= CV303
= 6H2
= 6F22_Sweden
Feb.1941
Tube leaflet collection E.Erb Philips Book III [178]
Loctal-8, B8G (Sylvania, 1938) (Codex=Waa)
Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
29 Tube prices (visible for members
only)
- - Manufacturers Literature 1940
Philips Bulletin Juli 1941
Taschenbuch zum Röhren-Codex 1948/49
EF22: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
EF22: My tubes
Anonymous 413 Collector
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EF22: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
EF22: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
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https://www.radiomuseum.org/tubes/tube_22.html
https://www.radiomuseum.org/tubes/tube_ef22.html
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22 Tube
