Loctal phenolic wafer chassis mount sockets for tube types such as 7F8, 7N7, 35Z3 etc. New old stock, made by Ediswan Clix in Britain.
The distance between the mounting hole centers on these sockets is 1 3/8 inch (38 mm), the chassis hole for the tube can be between 1 and 1 1/8 inch (25.5~28.5 mm) diameter.
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