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Tube socket PLK7-E60 (ПЛК7-Э60) is a 7-pin metal-ceramic tube socket with aluminium shield (H = 60 mm). This tube socket is ideal for tubes with general height ~ 60 mm (measured from the bottom of the pins to the tip of the glass envelope). It is suitable for tubes like 6C4P-EV (6Ц4П-EB), 6Z31, 1L33, 1L34, 6F31, 6CC31, 3L31 Tesla and similar. Without the aluminum shield it may be used for all tubes with heptal (7-pin, B7G, small button) base. New old stock tubes, made in the end of the 60's.