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The 5J30 is an external magnet split anode magnetron for use between 10 and 375 MHz, quite low for a magnetron. The data-sheet refers to cooling the anode by circulating liquid, however, the hollow anode connecting tubes have no exit. It is possible that the liquid circulates round the outside with conduction draining the heat from the anode block.
The anode block is split with the filament running through the central hole.
The filament is a substantial wire.
A closer view, note the additional copper strips mounted on top of the copper blocks.
The anode connections are hollow and show signs of corrosion/deposits through use.
The solid pins for the filament connection.
The anodes have copper strips mounted both top and bottom. The strips have been soldered in place.
See also 5J29 and 5J32 for two others in the series.
The wide glass tube envelope is 50 mm in diameter and, including the base pins, is 142 mm tall.
References: Data-sheet. Type 5J30 was first introduced in 1946.


Absolute Maximum Operating Conditions
General Notes
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2021.
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