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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
Perfectly matched Pair both tested 2300 µmhos on Hickok 752A. Min is 1200 µmhos ..
$22.99 USD
Used tubes from same audio channel, made in Germany. Results from test on Hickok 752A: 7000/725..
$44.99 USD
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