G.E ONE (1) 5965A dual triode tNOS AT1000 TESTED Balanced! PI Vacuum Tube T4 cleartop IBM selected red tip 12AV7 1961-1975

This listing is for one (1) GE-made 5965A dual triode 12AV7 vacuum tube in the standard tube shape. It has a 9-pin B9A miniature base, grey ribbed plate, and dual side getter. Some of our stock is re-labeled or marked with the OEM of IBM. If you're looking for a particular brand, please message right as you order - we pack and ship quickly!

Red tip selected by IBM, side getter type T3. GE made T1 in 1954, featuring black wing-shaped plates. Rare T2 from 1955-1956, featuring black ribbed plates and top getter. T3 from 1955-1961, featuring grey ribbed plates and top getter. T4 was made from 1961-1975, with dual side getters.

This tube has been tested to be perfectly balanced in transconductance (Gm) between the two sections. It is appropriate for phase-inverter positions and other demanding roles.

Your tube has been fully tested on a computer-regulated, USA-made 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 transconductance for each section must measure between 6800 uMhos and 10200 uMhos, consistent with original 1961 RCA, Western Electric, 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 1.8 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 tNOS or Used Good tube you receive from Sound By Doc is guaranteed against failure for 60 days after purchase, an industry extreme!

OPTIONS (use offer feature in Reverb):

Want a regular white box? $1 extra per tube
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 per tube
Want two tubes that match one another within 10%? [Matching is based on plate current for power tubes and GM for all other tubes] $5 extra per tube.