Antique radios, Old Time Radios
708A
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Country:
United States of America (USA)
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| Identical to |
708A
= CV3590
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| First year |
1941
-- Original-techn. papers.
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| Predecessor Tubes |
D-160127
D-160206
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| Base |
SPECIAL TUBEBASE in general
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| Was used by |
Radar |
| Filament |
Vf 1.7 Volts / If 1.85 Ampere / Direct |
| Description |
UHF grounded grid mixer triode for radar receivers. Flanged steel body with grid connected; three coaxial feed-through pins for filament and anode from the bottom plate. Top glass vacuum seal. Mu 10, f max 3GHz. Designed for operation around 700 MHz, it was used in early 1-3GHz radar sets. Also made by TungSol
Introduced by WE in 1941; source: Waveguide Transmission by George C.Southwoth, Bell Labs Series, chapter IX.
The use of a vacuum triode as mixer in 10-cm radar receivers was preferred before the availability of reliable TR cells, due to the intrinsic protection against burnouts during the magnetron pulses.
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