Antique radios, Old Time Radios
QP22A
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Country:
Great Britain (UK)
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| Identical to |
QP22A
= BLL32
= K77A
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| First Source
(s) |
1935 : -- Original-techn. papers.
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| Base |
B9 British 9-Pin (Codex=Yx)
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 2 Volts / If 0.45 Ampere / Direct / Battery = |
| Description |
Announced in the 1935 Data book of Mullard.
Each section of the valves are graded with the letters P,Q,R,S, or T. etched on the glass above pins 2 and 7 which identify the two halves. This enables screen voltages in the range 103.5 to 133.5 to be selected to achieve a balance between the two sections without the need to measure the anode currents.
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| Information source |
History of the British Radio Valve to 1940 p. 142 & 188
- - Manufacturers Literature Mullard 1935
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
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QP22A: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20
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Just Qvigstad
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QP22A: Mullard Valves 1936
Peter Hoddow
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):3
Collection of
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