Two, Mullard 12AX7/ECC83 tubes. Long, ribbed, grey plates, twin support square getter, mc1 construction. Tested on a Hickok TV-3 military tester that has been calibrated. Straight pins, excellent original logos, excellent silvering. Tubes are matched inside and out for structure and test at 2250-2125, 2125-2125, where pass/fail is 950 micromho. The tubes have etched dates codes of "mC1 B7J" and "mC1 B7E", manufactured in May and March 1957 at the Blackburn, England plant.  The tubes have been tested in a mono phonograph player using a GE VR cartridge and are absent of microphonics or noise.

Many other lots of tubes for sale this week.

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