Vintage MULLARD EL-37 . These beautiful tubes have been in storage for many years. Two of the labels are 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 1% across 2 of the tubes. Current in cathode bias test amp measured 60ma ,60ma, 60ma, gm results 5750, 5750, 5000, where average new is 5000 No Gas. No Shorts. No Rattles. Nothing broken inside tubes. Sounded glorious with good emission, tubes will be well packed.buyers pays actual shipping and paypal fees
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