Antique radios, Old Time Radios
4439
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Country:
United States of America (USA)
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| Identical to |
4439
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| Similar
Tubes |
Different connections:
4438
; 4440
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| Filament |
--/-- |
| Description |
Ten-stage, ruggedized, flat-faced type having S-11 response. Wavelength of maximum response is 4400 +/- 500 angstroms. Makes use of cesium-antimony dynodes and a flat-circular, cesium-antimony, semi-transparent photocathode. Window material is Corning No. 0080 lime glass or equivalent. Used for measuring nuclear radiation.
Identical to type 4438, except this one has a small-shell duodecal base attached to flexible leads. This base is for testing purposes and should be removed prior to installation.
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Dimensions (WHD)
incl. pins / tip |
40 x 99 x mm / 1.57 x 3.90 x inch |
| Information source |
Tube Lore (II) Page 174
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