Western Electric Microwave Cavity with #416B "acorn" vacuum tube, 1950's vintage For Sale

Western Electric Microwave Cavity with #416B


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Western Electric Microwave Cavity with #416B "acorn" vacuum tube, 1950's vintage:
$33

Rare Western Electric Microwave component, a 1950's vintage "Cavity" and its type 426B vacuum tube.The item is clean, mostly painted and with no significant scratchesA cavity houses a microwave tube, with mechanically adjustable size to tune its operating frequency. This particular unit was salvaged from decommissioned equipment at an ATT microwave site in around 1960 - one of those square towers with several big "sugar scoop" horn antennas common at that time.This item is a complex, finely machined, brass unit with silver-plated internal areas, and is over 4.5 pounds and some 8" in length.The chromed ring at the center rotates several turns, apparently adjusting the length of the inner cavity to adjust its frequency.The large brass nut next to that ring opens the unit to gain access to the type 416B vacuum tube inside. It appears that a "spanner wrench" would remove a ring to allow that tube to be removed. This tube is included in the sale of the overall assembly.The cap at the left end opens that portion of the unit, exposing the base of the gold-plated 416B tube (note: the 416B tube shown in the last photo is NOT the one in this unit - it does not come out with that part of the assembly, and is shown here only as an example and is not part of this sale listing). The base of an identical tube can be seen when looking into the opening where that cap assembly was removed.For someone familiar with this device, it should be an interesting display/conversation piece.
Downsizing, time to sell.Will ship as USPS economy package (or Priority at your option), US Only.


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