RCA etc. ONE (1) Type 2A5 Pentode Power Amplifier Antique tNOS AT1000 TESTED Vacuum Tubes Engraved A

This listing is for One (1) Type 2A5 Pentode Power Amplifier Antique vacuum tube in the ST (Coke Bottle) tube shape. It has a engraved black 6-pin UY base, black plate, and bottom getter. Labels in stock include RCA, NU, Majestic, Philco. If you're looking for a particular brand, please message right as you order - we pack and ship quickly!

Only Majestic is engraved base.

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 27.2 mA and 40.8 mA AND transconductance must measure between 2000 uMhos and 3000 uMhos, consistent with original 1932 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 3.4 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:

Want a regular white box? $1 extra
Want a tube that's packed in its original box? $3 extra per tube
Want the test results recorded on your box, too? $3 extra
Want two tubes that match one another within 5% for emissions and GM? $5 extra per tube
Comfortable with a tube that has tape at the base? Save $1
Comfortable using a tube that tests NOS but with a gas current that tests too high on the AT1000? Some people report success heating their gassy tubes for a couple hours to reactivate the getter flashing. Wanna try? Save $4