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The factory codes on these tubes are: AAA3 B3J5 AND AAA3 B4I5Made by Mullard in Blackburn, England T..

$39.99 USD

New Pair, tested 950 and 960 µmhos on Hickok 752A, where minimum is 500 ..

$17.99 USD

Used Pair Tested 7700/7600 µmhos on Hickok 752A. Min is 3750 µmhos ..

$49.99 USD

Pair RCA Fat Bottle Gray Plate NOS Vacuum Tubes7591 in 9-T9 bulb and the compactron equivalent is 78..

$119.99 USD

Both sections have identical test results using Hickok 752A. They have the same QO code.I believe th..

$29.99 USD

Perfectly matched Pair both tested 2300 µmhos on Hickok 752A. Min is 1200 µmhos Used pair..

$22.99 USD

The pentode sections are perfectly matched. All have the same QO code.Hickok 752A tested 600/1050, 6..

$44.99 USD

5 closely matched NOS tubes branded Philips with Mullard, Blackburn "B" codeHickok 752A results are:..

$19.99 USD

Tubes tested New: 1000, 1025, 1025 & 1100 µmhos on Hickok 752A. Minimum is 700Same date codes, J..

$17.99 USD

Pre-owned tubes tested on Hickok 752A. Pentode tested 650 and 600, min 500Triode sections tested 700..

$24.99 USD

Used tubes from same audio channel, made in Germany. Results from test on Hickok 752A: 7000/725..

$44.99 USD

Uprated 6BQ5 tubes Tested 825 & 850 µmhos on Hickok 752A. Minimum is 575 Made in Canada, l..

$89.99 USD

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