Antique radios, Old Time Radios
2B7S
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Country:
United States of America (USA)
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Brand:
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| Tube type: |
Double Diode-Pentode RF/IF-Stage Controlling (mu) |
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| Identical to |
2B7S
= ER2B7
= G-2B7-S
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| Similar
Tubes |
Normally replaceable-slightly different:
2B7
; PH2B7
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| Base |
7-Pin-Base U7A = small, old, USA
Top contact with a cap.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 2.5 Volts / If 0.8 Ampere / Indirect / Specified voltage AC/DC |
| Description |
Glass type used as combined detector, amplifier, and avc tube.
Which differences of characteristics between 2B7S and 2B7 ?
Babani's International Radio Tube Encylopedia gives somme different value as a 2B7, but Brans Vademecum 1945 and 1961 gives as electrical equivalent. The Majestic tube shield is metallised paint. Replacement tubes made by National Union, Raytheon and Sylvania utilised a sheet metal shield.
Text in other
languages (may
differ)
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Dimensions (WHD)
incl. pins / tip |
x 116 x 38 mm / x 4.57 x 1.50 inch |
| Weight |
39 g / 1.38 oz |
| Information source |
Babani, International Radio Tube Encyclopaedia p. 4 & 5
-- Collector info (Sammler)
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2B7S: Fin Stewart
Fin Stewart
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Just Qvigstad
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2B7S: Babani 1949-1951
Patrice Zeissloff
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