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TUBE MUSEUM NEW YORK 1964 ORIGINAL JHS SYLVANIA BLACK-PLATE USA USA 5687 MIRROR-MATCHED PAIR Phenomenal TUBES! phe·nom·e·nal / fəˈnämənəl 1. Very remarkable; extraordinary. 2. Perceptible by the senses or through immediate experience. NOS EARLY 1960's SYLVANIA 5687 AMPLITREX CERTIFIED AUDIO TUBES BID 1 FOR A MATCHED PAIR! How many times have you purchased what you read advertised as a balanced and matched-triode tube on eBay and have received mismatched or marginal tubes? Well, get rid of those! Here is the HIGHEST QUALITY AMPLITREX DIGITALLY TESTED NOS (NEW OLD STOCK) SYLVANIA USA 5687 tubes that were made in 1964 that will end your search for the Top Quality you would expect from a Premium tube in your ultimate HI-FI AMPLIFIER or Musical Amplification system. NOS TUBE MUSEUM QUALITY 1964 NOS SYLVANIA USA JHS-5687 MATCHED PAIR BALANCED & MATCHED TRIODES PAIR (AVAILABLE!) tube 1: 39.0mA (108%) / 38.4mA (106%) WOW! tube 2: 38.2mA (106%) / 37.6mA (104%) WOW! SYLVANIA 5687 is world known as the BEST 5687 ever made! BOX DISPLAYED INCLUDED IN SALE - ORIGINAL BOXES Actual pictures of the Black -Plate 5687 pair BID 1 FOR A MATCHED PAIR! These tubes actually have independent triode sections! (2 doubled-up mica insulators on the top insulator on the bottom) but we will call these "ruggedized" construction classification of all USAF 5687 tubes capable of being held in 3 different positions in a Navy type (flyweight) Shock Machine and are subject to 600 g impact acceleration & 2.5 g vibrational acceleration at 25 cycles for 32 hours in SYLVANIA Military Spec Factory testing and burn-in . These are the BEST SOUNDING 5687 ever made! 17.5mm BLACK PLATE PAIR for Audio Note 🎵 BLACK PLATE PAIR DUAL SILVER STABILIZER RODS Beautiful 1960s vintage with stapled reinforcements and extra thick micas BID 1 FOR A MATCHED PAIR! 5687 recommended in .... - Audio Note M3 - Audio Note amp kits, M5 preamp, M9 - Ayon CD player - Audio Note DAC 5 Signature - Audio Tekne TFM-9412 - Artemis Labs linestage - Almarro A50125A Power Amp - Almarro A340 Power Amp - ANALOG METRIC HA 6N6 (5687) Preamplifier Amplifier Kit - World Audio Designs 300B Amp - Ongaku and OTHER Audio Note - Diego Nardi 5687 ‘WOT’ (With Output Transformer) transformer-coupled line-stage - Manley Jumbo Shrimp - KR Enterprise 32BSI integrated SET amp - Modwright 9.0 - Modwright Sony NS999ES CD player - Opera Audio Consonance Cyber 800 - Manley amps - LUX 300B amp - Kondo M1000 - Emotive Audio Sira and Sira-LE Amp - Emotive Audio Poeta Amp - Emotive Audio Vita Mono Power Amps - Ray Samuels B52 and Raptor - Sonic Frontiers Power 2 Amps - Audio Experience BALANCED A2 preamp - New Audio Frontiers Legend II preamp - Loth X JI300 - Mastersound Reference 845 - Sophia Electric KT88 Tube Amplifier - Icon Audio PS3 phono power supply - Zanden 3100 Amp - Zanden 9600 Amp The BEST SUPER 5687 MADE TO STRICT RUGGEDIZED AIRBORNE MILITARY SPECIFICATIONS! 1960's NOS SYLVANIA USA 5687 Special ruggedized tube SIMPLY the PERFECT REFERENCE 5687 AMPLITREX TESTED TUBE BY WHICH ALL OTHER 5687 's CAN BE MEASURED BY! BID 1 FOR A MATCHED PAIR! CERTIFIED ULTRA-LOW-NOISE SPECIMENS TubeMuseum tested tubes takes the guesswork out of the process of selection delivering you the best Audio tubes that there possibly can be. PROPERLY PRESERVED OVER HALF-CENTURY+ NEW-OLD-STOCK TUBES BID 1 FOR A MATCHED PAIR! Tested on the Amplitrex AT-1000 digital tube test computer based system all tubes test with closely matched Mu and Rp Ohms Matched Gm Matched "Mu" = Tube Gain Matched "Rp Ohms" = Plate Resistance Tested in the true 5687 fixed bias settings ! TubeMuseum tested tubes takes the guesswork out of the process of selection delivering you the best Audio tubes that there possibly can be. What I like about this tube is that has Matched & Balanced Mutual Conductance and mA with Uniquely Matched Plate-Resistance (Rp)& matched Tube-Gain (Mu) This is Beautiful PROPERLY PRESERVED & STORED 64 YEAR OLD NOS (NEW OLD STOCK) NEVER USED! MADE IN USA SUPER STRONG TUBES! TESTED AT REAL-WORLD POWER LEVELS ON AMPLITREX AT-1000 TEST BALANCED & MATCHED BETWEEN TRIODES WITH MATCHED PLATE RESISTANCE and MATCHED TUBE GAIN ON BOTH SIDES! Tested on Amplitrex AT1000 Digital Tube Test System This tube is known for excellent performance, smooth highs, outstanding 3-D holographic soundstage, lots of open-air, inner detail, and overall perfect resolution and balanced sound. Terms of Auction BID 1 FOR A MATCHED PAIR! THE COST OF ALL USA SHIPPING INCLUDES INSURANCE, TRACKING NUMBER AND DELIVERY CONFIRMATION CERTIFIED LOW-NOISE TESTED TERMS & CONDITIONS OF SALE Domestic & International Buyer's 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. Absolutely NO RETURNS on special orders or best-offer deals. 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 CONFIRMATIONM No zero (0) status bidders without permission, or we reserve the right to cancel your bid. Buyer is responsible for all import duties at price paid for item(s). TUBE MUSEUM NEW YORK 1960's ORIGINAL SYLVANIA USA 5687 MIRROR-MATCHED PAIR Phenomenal TUBES! phe·nom·e·nal / fəˈnämənəl 1. Very remarkable; extraordinary. 2. Perceptible by the senses or through immediate experience. NOTICE: All text & images © 2002-2024 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. All photographs and text appearing in the Tube Museum New York (TubeMuseumUSA) site(s) are the exclusive property of The Tube Museum New York © (except where stated otherwise) and are protected under international copyright laws and treaties. They are made available for your personal viewing enjoyment only. No images or unique text are within the Public Domain. 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