RCA ONE (1) Type 71A GLOBE Power Amplifier Antique tNOS AT1000 TESTED Vacuum Tube Audio 1926-1930

This listing is for One (1) Type 71A Power Amplifier Antique vacuum tube in the S (Globe) tube shape. It has a engraved black 4-pin UY base, Nickel plate, and bottom getter.

Your tube has been fully tested on a computer regulated Amplitrex AT1000 on Fixed Bias setting with like new, NOS results (tNOS). Here's what that means: to qualify for this listing, several stringent conditions must be met: The plate current must measure between 13.84 mA and 20.76 mA AND transconductance must measure between 1320 uMhos and 1980 uMhos, consistent with original 1926 RCA, Sylvania, GE, and/or Tung-Sol datasheet specifications for new tubes of this type. The tube must also show no shorts, show a gas current less than 1.73 mA, and a heater-to-cathode leakage of less than 10 microamps (10 uA). The tube might have mechanical wear or have the label rubbed off - these are very old! Used-testing tubes are available in a separate listing at a significant discount. Every tube you receive from Sound By Doc is guaranteed against failure for 60 days after purchase, an industry extreme!

OPTIONS (use Reverb offer feature):

Want a regular white box? $1 extra
Want the test results recorded on your box, too? $3 extra

Don't mind a gassy tube? Save $10!