Vintage MULLARD IEC KT-66 quad .
These tubes were used a few hours and stored for last 20 years. One of the labels is partially rubbed off (see pictures ). All have tight bases.
Tested on my calibrated hickok 533a and in a Williamson amplifier test rig. Gm is matched within 5% across all four tubes. Current in cathode bias test amp measured 59.5ma ,61ma, 61ma, 64ma
gm results 6000, 6000, 6500, 6375, where average new is 6300
No Gas. No Shorts. No Rattles. Nothing broken inside tubes. Sounded glorious with good emission, tubes will be well packed.I am selling the tubes as-is , no returns , USA sale only buyers pays actual shipping and paypal fees,
don't believe the hype ! The new production russian reissue can't hold a candle to sound of original Mullard kt-66 tubes
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