Tung-Sol Matched Pair (2) 6SN7GT tNOS AT1000 TESTED Vacuum Tubes T3 mouse ears dual triode 1950-1952

This listing is for a Matched (10% in GM) Pair (2) of Tung Sol-made 6SN7GT dual triode vacuum tubes in the straight-walled glass tube shape. They have a black bakelite octal base, inward-facing black T plate, and bottom square getter. Some of our stock is re-labeled or marked with the OEM of Emerson, Westinghouse, Zenith, Admiral, Silvertone. If you're looking for a particular brand, please message right as you order - we pack and ship quickly!

This is T3 with cute mouse ears. The civilian 6SN7 tubes from Tung Sol have been given "type codes" by Sound by Doc as follows: T1 (pre 1951) GT, medium glass, bottom square getter, parallel ribbed black flat plates with 2 support rods. T2 (1950) rare square mica mouse ears, inward-facing T plates. T3 (1950-2) Mouse ears black T plate. T4 (1952-3) Mouse ears grey T plate. T5 (1953-5) inward-facing grey T plates. T6 (1956) Just like Sylvania "Tall Boy," 2-hole inward-facing black plates. T7 (1956-61) top getter tall glass angled black T plates. T8 (1962) rare medium glass. T9 (1962-6) short glass.

These tubes have been selected to match one another for optimal performance! Matching is based on plate current for power tubes, voltage drop for rectifiers, and transconductance (Gm) for other tubes.

Your tubes have 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 2080 uMhos and 3120 uMhos, consistent with original 1950 RCA, Western Electric, Sylvania, GE, and/or Tung-Sol datasheet specifications for new tubes of this type. The tubes must also show no shorts, show a gas current less than 0.9 mA, and a heater-to-cathode leakage of less than 10 microamps (10 uA). The tubes 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!

These photos are not stock photos. You are looking at the actual tubes you will receive. If a box or boxes are in the photos, you will get them. If test results appear in the photos, look close, because those are the test results of the tubes you will receive! SKU 6SN7-322T3mp. Please note that matching is nearly always possible for us from stock that is inventoried but not yet listed. If you need a matched pair or quad etc., please use the make-an-offer feature through Reverb. Matching requires an extra burst of effort, so please add $5 per tube to your offer for 10% matching and $10 per tube for 4% matching. [Matching is based on plate current for power tubes, voltage drop for rectifiers, and GM for all other tubes. If you also require the label or internals to match, please specify that in your offer.]