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The GL-5J29 is a two anode magnetron.

The filament is visible as a rod passing through the circular hole formed by the two anodes. An output tuned circuit would be connected to the anodes with the DC power fed into a centre tap.

The base is a four pin special, with two large pins and two small pins.

The wide glass tube envelope is 47 mm in diameter and, excluding the base pins, is 150 mm tall.

Reference: Data-sheet. Type 5J29 was first introduced in 1946. See also 1946 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.