Antique radios, Old Time Radios
728BY
| Was used by |
Radar |
| Filament |
Half indirect |
| Description |
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728A - J family includes fixed frequency magnetrons from 900 to 970MHz; operating frequency is identified by a two letter suffix from AY to JY, spaced 7MHz from each other. Eight hole-and-slot cavities, double-ring strapping.
1000 to 1200 gauss, 19 to 24.5 kV at 19 to 28 A input pulses, 210 to 400 KW peak out. Driven by a spark wheel modulator at 210 to 400 pps.
All replaced by the tunable version 728T (4J51)
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| Information source |
Tube Lore (I)
-- Original-techn. papers. BSTJ, Vol.XXV, April 1946
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You reach this tube or valve page from a search
after clicking the "tubes" tab or by clicking a tube
on a radio model page. You will find thousands
of tubes or valves with interesting links. You
even can look up radio models with a certain tube
line up.
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