VALVO HOLLAND EC92 6AB4 for NEUMANN UM57 UM92 AMPLITREX TESTED TROPHY QUALITY

Historic TubeMuseum, Tuxedo Park, New York Established in 1928 as a premier research facility in Tuxedo Park, New York, that attracted such brilliant and most visionary minds of the twentieth century – Albert Einstein, Werner Heisenberg, James Franck, Niels Bohr and Enrico Fermi to name a few. The Tuxedo Park lab attracted these top-flight scientists who experimented with audio, sound, time measurement, and radar waves. He turned this Tuxedo Park laboratory into a meeting place for the most visionary minds of the twentieth century; Albert Einstein, and the aforementioned scientists. Today this location is the home of The Tube Museum New York. ( featured on Wikipedia® ) Welcome to … Visit this seller’s eBay Store! TUBE MUSEUM NEW YORK Dear tubemuseumusa, The EC92 tube is working perfectly in my UM 92, and my mic is sounding beautiful! Thank you so much for working with me on this. – maddstylin Seller went above and beyond to help me restore my $3000.00 mic! A+++ shipped quickly, item as described. thanks ( EC92 6AB4 for NEUMANN GEFFEL UM57 UM92 1960’s) CERTIFIED LOW-NOISE SPECIMEN TUBE MUSEUM QUALITY REAL NEW OLD STOCK FROM 1960’s NEVER USED “TROPHY-QUALITY” AS DISPLAYED IN PHOTOS VALVO HOLLAND EC92 6AB4 MADE IN HOLLAND PICTURES OF ACTUAL TUBE VALVO NOS EC92 = 6AB4 CHOSEN AS PART OF THE ORIGINAL SUPPLIED TUBE COMPLEMENT (MIC NOT INCLUDED) The ‘Neumann’ UM-57 is really a Gefell (East German) mic with a large M7 capsule and 3 patterns, selectable at the power supply. It was introduced in 1957, and was the first variable pattern mic to be introduced by Gefell. In many ways its appearance is similar to the UM 92 by Microtech Geffel. It is similar in concept to the M49 and C12A, in that the one diaphragm is connected to earth, the back-plate is connected to the input of the tube, and is at 60volt, and the second diaphragm is varied from 0 – 120volts from the power supply to give you the various patterns. Make sure you have the power supply as the pattern switching is on it, and not on the mic. It uses an EC92 triode for the tube. EC92 TUBE EXTREMELY Rare NOS RESTORE YOUR NEUMANN TO THE ORIGINAL SUPPLIED TUBE COMPLEMENT IT DESERVES! Tube has the FAT-GETTER RING as seen in many Telefunken tubes, and in 1954 they were pre-< > diamond mark, probably made in a joint venture with Siemens and Halske from West Germany, that’s what Telefunken did in 1954 Tube 1: 5 ,800 mA/V (Available!) Tube 2: 5 ,500 mA/V (Available!) 5,500 = 100% SAME DAY SHIPPING! BUY IT NOW IT SHIPS TODAY! CERTIFIED LOW-NOISE SPECIMEN THE FINEST YOU CAN GET IN NOS NIB NOISE-TESTED TUBES! CERTIFIED LOW-NOISE SPECIMEN TUBES were tested on the State-of-the-Art AMPLITREX AT-1000 Electron Tube Test System – AMPLITREX PLATE-CURVE CHARACTERISTICS All Tubes Tested on Amplitrex AT1000 DIGITAL ELECTRON TUBE TEST SYSTEM These are rare tubes in this Quality Tested electrical condition CERTIFIED ULTRA-LOW-NOISE MIC SPECIMEN TubeMuseum tested tubes takes the guesswork out of the process of selection delivering you the best Audio tubes that there possibly can be. Terms of Auction International Buyers – Please note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to bidding or buying. We do not low declare and we insure for full value. Per eBay’s terms of service which every eBay account holder must agree to as part of being an eBay member, a bid is a legally binding contract. Please read the Terms & Conditions carefully before bidding. By bidding on this auction, you understand and agree to eBay’s terms of service as well as all terms and conditions mentioned here. Buyer pays all shipping, Item must be in original condition including cosmetic lettering on tubes so handle with white-glove care, un-used with all original boxes, packing material, environmentally safe cornstarch pellets, and shipping box. ALL RETURNS subject to a 10% handling charge. Absolutely NO RETURNS on special orders or best-offer deals. All sales are final with NO RETURNS on self installed mic tubes. All exchanges must be pre-paid and returned in original packing, complete with no sign of wear or abuse, exactly the same condition as it was when you received it. In the event that the product is not in the same condition, and does not test the same as you received it, you will be subject to a refusal and return, a determined restocking fee, repair charge, or disqualification. RETURN AUTHORIZATION (RA) number and instructions is required before sending any items. Shipping and handling charges are non-refundable. We do not guarantee that your tester, or your tester’s measurements will be the same as the Amplitrex AT-1000. Older testers, different testers, or the same tester may report different test measurements, and may not measure the same tube meaningfully (due to current dependency), accurately (due to calibration difficulties) or consistently (due to internal circuit drift) There is no warranty or returns based on what any other tube tester reports. THE COST OF ALL USA SHIPPING INCLUDES INSURANCE, TRACKING NUMBER AND DELIVERY CONFIRMATION TUBE MUSEUM NEW YORK Visit this seller’s eBay Store! NOTICE: All text & images © 2002-2023 Copyright © of The Tube Museum New York © All Rights Reserved By entering this site you are agreeing to be bound by the terms of this agreement. 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