Rare Sylvania X6030 Noise Diode. A quick Google search didn't turn up much except the name. Be the first in your club to own one. Not tested, Sold as-is. ( Thanks to Don Resor more info about this tube may be found at http://www.introni.it/pdf/15%20-%20Crystal%20Rectifiers.pdf beginning on page 285) Item #10309
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John E. Kendall
jkvintel@gmail.com
Vintage Electronics
2416 Watervale Rd
Unit 436
Fallston, MD - 21047