It is a socket used for output tubes, such as 300B and 2A3.
Matching vacuum tube
300B, 2A3, 45, 83, 811A, WE274A etc
The attachment hole 30 mm dia., the attachment screw interval of 38.2mm
Matching vacuum tube
300B, 2A3, 45, 83, 811A, WE274A etc
The attachment hole 30 mm dia., the attachment screw interval of 38.2mm
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