RCA Matched Pair (2) EL84 6BQ5 tNOS AT1000 TESTED Vacuum Tubes beam power pentode 1960-1975

This listing is for a Matched (10% in plate current) Pair (2) of RCA-made EL84 6BQ5 beam power pentode vacuum tubes in the standard tube shape. They have a 9CV 9-pin miniature base, grey plate, and top halo or disc getter.

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 38.4 mA and 57.6 mA AND transconductance must measure between 9040 uMhos and 13560 uMhos, consistent with original 1960 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 4.8 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!

OPTIONS (use offer feature in Reverb):

Want a regular white box? $1 extra per tube
Want the test results recorded on your box, too? $3 extra per tube
Want two tubes that match one another within 4%? [Matching is based on plate current for power tubes and GM for all other tubes] $10 extra per tube