Antique radios, Old Time Radios
SP4
|
Country:
Great Britain (UK)
|
|
| Identical to |
SP4
= E446
= ACHM4
|
| Similar
Tubes |
Normally replaceable-slightly different:
AC/SP
; ACHN4
; T4600
Other base:
8A1_7pin
Differences not known by us:
SP4/5
|
| First Source
(s) |
22.Nov.1935 : Wireless World (The), London (WW, 79)
|
| Base |
Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Nc)
Top contact screw type.
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 4 Volts / If 1.1 Ampere / Indirect / Specified voltage AC/DC |
| Description |
1933 Mullard data quotes the heater current as 1.0A.
Intended for use as first detector or freuency changer in superhets.
Text in other
languages (may
differ)
|
Dimensions (WHD)
incl. pins / tip |
50 x 150 x mm / 1.97 x 5.91 x inch |
| Weight |
63 g / 2.22 oz |
| Information source |
History of the British Radio Valve to 1940 [p. 142, 194 & 196
- - Manufacturers Literature
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
|
|
SP4: Telefunken Werkstattbuch
Wolfgang Bauer
|
Just Qvigstad
|
SP4: Mullard Valve Guide 1933-4
John Turrill
|
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):74
Collection of
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| Data Compliance |
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