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Type T21 is a WWII vintage Taylor Tube equivalent of the Raytheon type RK49. It is essentially a beam tetrode of the 807 class but single-ended.
The classic envelope is 48 mm in diameter and, excluding the base pins, is 105 mm tall.
References: Datasheet.


Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December05, 2012.
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