Two, Western Electric WE-217-A tubes, with the "tennis ball" glass envelope. Metal base, original metal finish, firm bases, good, full glass tips at the top of the bulb, no chips. All internal structures are solid, without rattle or cracks. This is a single diode, used in pairs in the 2A Current Supply- used to power the 7A and 14A amplifier. Tested on a Hickok TV-3 military tester that has been calibrated. Tubes are tested as "half of a #80 tube" at 6.3 V filament voltage. Tubes test strong at 110 and 107 where 80 is the pass fail. These are relative values and do not represent percentages. There is no blue gas when plate voltage is applied. This tube is intended to be used in the 2A Current Supply which supplies a 120 V B+ voltage, this is not for applications producing several hundred volts. These tubes are almost impossible to find, especially testing good. Ensure that your 2A supply filter capacitors are healthy before attempting to power the unit with good WE 217A tubes. 

Many other lots of tubes for sale this week.

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