Antique radios, Old Time Radios
1640
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Country:
United States of America (USA)
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| Identical to |
1640
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| Similar
Tubes |
Normally replaceable-slightly different:
6405
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| Base |
UX-Base (4 Pins (2 thick, USA 1924, UX)
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| Was used by |
Industrial |
| Filament |
--/-- |
| Description |
Low-microphonic side-on type having S-1 infrared response. Wavelength of maximum spectral response is 8000 +/- 1000 angstroms. Makes use of a semicylindrical photocathode, and has a direct interelectrode capacitance of 2.6 picofarads.
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Dimensions (WHD)
incl. pins / tip |
29 x 113 x mm / 1.14 x 4.45 x inch |
| Information source |
- - Manufacturers Literature
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Just Qvigstad
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| Data Compliance |
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