Diamond Bottom. "ULM" NOS.
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You rarely see them.
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They were made in Germany in the 1960s. The tubes are super rare, hard to find and in mint condition. The tubes are carefully tested on my tube tester Avo CT160 as in the photos. Gm: 2.2mA/V (100%).
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Tested with Roetest V10, "the Rolls Royce of tube testers" [emissionlab quote], a wonderful german professional system for testing tubes, it shows everything about a tube. Roetest does this quickly and with great precision.
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eBay
The tube is in mint condition. All the tubes are carefully tested on my tube tester TV-7 and my amplifier before sending.
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See our site for new arrivals, reserve/request options, limited run special editions.
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