Mullard 1% Tight Matched Pair (2) EL34 6CA7 dual getter tNOS AT1000 TESTED Vacuum Tubes Blackburn Xf2 brown base Power Pentode 1962-1968

This listing is for a Tightly-Matched (4% max variation in plate current) Pair (2) of Mullard-made EL34 6CA7 Power Pentode dual getter vacuum tubes in the straight-walled glass tube shape. They have a dark brown octal base, grey plate, and dual top halo getter. Some of our stock is re-labeled or marked with the OEM of Dynaco, Amperex, RCA. If you're looking for a particular brand, please message right as you order - we pack and ship quickly!

Perfect match in plate current AND 1% in GM! Welded flat plates have two notches.

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 by the power tubes: The plate current must measure between 80 mA and 120 mA AND transconductance must measure between 8800 uMhos and 13200 uMhos, consistent with original 1962 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 10 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 EL34-1022XF2dgmp. 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.]