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Last PAIRS available "NEW OLD STOCK "USA SYLVANIA 6SN7GT BLACK-PLATE 3-STAPLE HOLE (per side) "FAMOUS CHROME-TOP" AUDIO TUBE, excellent lush sounding, very rare blackplates from the USA, same tube construction was made for the United States Military but labeled VT231 WITH THE DESIGN. These rival the RCA 5692 redbase in sound and black-plate construction quality, and are as scarce. Sylvania labels, the construction of these to me look to be ENGINEERED VERY WELL AND NEVER TO BE MADE AGAIN!. VERY difficult to find these in PERFECT SOUNDING tubes! Visit this seller's eBay Store! TUBE MUSEUM NEW YORK CHECK OUT THIS YouTube VIDEO FEATURING SYLVANIA 6SN7-GTB TUBES: https://youtu.be/YCx4mir-HpU 3-HOLE BLACK-PLATES AND TEST MEASUREMENTS LISTED BELOW OF THE TUBES YOU WILL RECEIVE AMPLITREX AT-1000 DIGITALLY TESTED SYLVANIA USA 6SN7-GT TUBES 6SN7-GTA 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 (first klystron tube). Welcome to the ... TUBE MUSEUM NEW YORK BID 1 FOR A PAIR ! New-Old-Stock SYLVANIA USA "MAGNAVOX" LABELS FAT-BASE TUBES Made in USA in 1958 SIXTY-SIX (66) YEAR-OLD NOS TUBES! CHROME-TOP 6SN7-GTA PRINT ON TUBES AS DISPLAYED A RARE LIMITED QUANTITY PAIR PAIRS @ 2,400/2,400 % 2,400/2,400 (+/- 10%) SYMMETRICAL MATCHED PAIR L@@K! MATCHING CODES! SYLVANIA 6SN7-GTA LABELLED FOR MAGNAVOX SIXTY-SIX (66) YEAR OLD SYLVANIA 6SN7-GTA MATCHED PAIR! Dual Triode Perfect ELECTRICAL Matched Pair Sub-bass (10Hz - 60Hz) CHECKED & PASSED Mid-bass (80Hz - 200Hz) CHECKED & PASSED Midrange (200Hz - 3,000Hz) CHECKED & PASSED High-frequencies (3,000Hz on up) CHECKED & PASSED "3-HOLE" BLACK-PLATES CHROME-TOP-SQUARE-GETTER SYLVANIA BLACK PLATE 6SN7GTA BALANCED TRIODE TUBES with Black Plates and Beautiful Full Chrome Tops pouring over the tops like chrome lava 3-STAPLE HOLES IN PLATES AS DISPLAYED SYLVANIA 6SN7-GTA LABELLED FOR MAGNAVOX Recommended for: - Mikhail Rotenberg’s Singlepower Audio massive SDS XLR amplifier. - Atma-Sphere P1 - Cary Audio SLP 05 - Grant Fidelity (Yaqin) B-283 mkII tube buffer - Valvet Audio preamp - Singlepower PPX3-SLAM - Aesthetix Calypso - CJ MV55 - Cary SLP-05 preamp - Yaqin MS-34C - Modwright Sony 5400ES - Oppo/Modwright BDP-95 - VAC Renaissance 30/30 MKIII - Bottlehead Crack OLD WORLD AUDIO TUBE WITH EXCELLENT VACUUM AND TEST RESULTS MUSEUM-CERTIFIED AMPLITREX TESTED! BID ONE (1) FOR A PAIR! Superior BLACK-PLATES with CHROME-TOPS designed for critical applications where 10,000 hour life, close triode section balance, rigid construction and stability are required. Mikhail Rotenberg’s Singlepower Audio massive SDS XLR amplifier. Recommended for: Cary Audio SLP 05 Cary SLP 88 - Cary 805M amps - Cary 300 SEI - Mastersound 845 monoblock 2008 - Audio Note M2 preamp - Aesthetix 10,000 hour low noise Matching Platinum Pair for a 6SN7 CLASS PREAMP 3-HOLE BLACK-PLATES AND TEST MEASUREMENTS LISTED BELOW OF THE TUBES YOU WILL RECEIVE 2,400/2,400 & 2,400/2,400 (+/- 10%) BEAUTIFUL LIQUID-CHROME SONIC HOLOGRAPHY …"Best described as having a euphonic sonic signature... Pervasive tube warmth that blankets the midrange irrespective of the program material falls in this category, and has proven to be a siren call for many 6SN7-GTA tube-o-philes. Overly liquefying harmonic textures make these tubes a real keeper"….. Sixty-SIX (66) YEAR OLD SYLVANIA 6SN7-GTA MATCHED PAIR! Rarely do you see such a fine tube pair with THICK-MASSIVE-CHROME-TOPS and Perfect Specifications: BID ONE (1) FOR the PAIR! ..."Pure MAGIC. metamorphoses into a sonic-tapestry of pure sonics - ethereal listening to absolute music, as if the amp is not even there. too perfect for this world! prepare to leave your body."... - TubeMuseum Sonic Feedback Great USA tube now extinct NOS - Made specifically for audio in the 1950's with codes which correspond to SYLVANIA "MAGNAVOX SET-CODES" for various radio/ receiver "sets" 3-HOLE BLACK-PLATES AND TEST MEASUREMENTS LISTED ABOVE OF THE TUBES YOU WILL RECEIVE! Superior designed for critical industrial applications where 10,000 hour life, close triode section balance, rigid construction and stability are required. 6SN7GTA BLACK-PLATES were also labelled and synonymous to VT-231 CHROME TOP getters and BLACK BASE "BLACK PLATES" Here is the pair of NEW OLD STOCK SYLVANIA 6SN7GT AUDIO TUBES, with phenomenal results MADE IN USA SYLVANIA BLACK PLATE 6SN7GTA PERFECT SOUNDONG MATCHED PAIR Superior BLACK-PLATE designed for critical industrial applications where 10,000 hour life, close triode section balance, rigid construction and stability are required. PASSED THE AMPLITREX DIGITAL TESTS = NO HEATER-TO-CATHODE LEAKS! Low-Noise Tested Microphonic Free No H-to-K Leakage (Heater-to-Cathode) No leaks (0) zero! Actual tube was tested on the State-of-the-Art AMPLITREX AT-1000 Electron Tube Test System CERTIFIED ULTRA-LOW-NOISE MUSEUM SPECIMENS 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 BID 1 FOR A PAIR ! We do not lower value for International shipping, so please don't ask 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. And let's get this straight in our understanding - I don't need any buyers who ask to break the law, the same items will sell to buyers whom abide by the law and are willing to go by the rules of their county. Audiophiles need and appreciate us - because most of the tubes being sold elsewhere are misrepresented and used defects being re-circulated from buyer to buyer. Tube Museum tubes takes the guess-work out of tube buying delivering the BEST QUALITY honestly tested and Certified stereo tubes. 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% MIN. 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 "EXPRESS SHIPPING" required for certain countries , (check first before you bid or we reserve the right to cancel your bid) PayPal Welcome! BID 1 FOR A PAIR! Please SEE my other ebay Auctions TUBE MUSEUM NEW YORK Visit this seller's eBay Store!