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>> WELCOME TO OUR 16th YEAR << *** ON EBAY !!! *** AUDIO DESTINY: PHILIPS HEERLEN SQ E188CC MATCHED PAIR PREMIUM QUALITY PAIR IDENTICAL DATE CODES: DELTA 9K1 (NOV 1969) EXCELLENT ELECTRICAL MATCHING ALL ACROSS THE PAIR This is a stunningly beautiful pair of PHILIPS labeled E188CC SQ GOLD PIN preamp tubes, well matched on our Hickok 752A, both side-to-side and tube-to-tube. These were manufactured by PHILIPS in the renown HEERLEN factory. MOST IMPORTANTLY: these have identical date codes from the pinnacle of tube excellence: (delta) 9 K 1. These codes are very hard to see or photograph because they are very faint - however they are quite there when viewed under our 100X stereo microscope! Thus these are the 'holy grail' of the E88CC type tube. Yes we have to say these sound even better than Siemens or even Telefunken. There is something very very magical about these, just sonically gorgeous! Without getting carried away as audiophiles have been known to do, these are vacuum tube perfection. Kinda like what happens when you hear real TFK ECC803S's... These are only for audiophiles that have came to the end of the line of sonic destiny. Just ENJOY, you've finally figured it out. Very good print as you can see in the pictures. Full NOS test levels, see test results below: They are fully socket-compatible with standard standard 6DJ8 types but are WAY better sounding . A superb pair for your high-end home audio as well as pro audio equipment. TEST RESULTS: LEFT TUBE : 13000/13000 uMhos RIGHT TUBE: 13000/12500 uMohs on our Nelson Calibrated Hickok 752A Brand new tubes test 12000/12000 uMhos typ. We have been selling superior quality tube sets for audiophiles on Ebay for 15 YEARS - look at our 100% + feedback and the list of brilliant and distinguished audiophiles that wisely buy from us for the finest sounding tubes. We are audio designers and enthusiasts - we know what makes great sound. We share our experience with our customers on what sounds great and how to get there. Just ask our happy customers! Many work for top tier audio companies and premier audio brands, people who would surprise most Ebayers. SHIPPING: We ship USPS for this light item - with full insurance for the listing price (so the cost will be a bit higher) . Please contact us for faster service at additional cost. We pack our audiophile items in an EXCEPTIONAL fashion - check our feedback. We do not rip off our valued customers by overcharging shipping! NOTE: we have had ZERO shipping damage in the last 5 years! RETURNS: As this is a DIY item, there are NO MANUFACTURER'S WARRANTY for this item. As a premium item we provide a 30-day return policy for honest customers who are just not satisfied strictly at our discretion (no joy rolling). Check our feedback, we are a high integrity seller. Product is sold on a strictly as-is basis. Please examine the pictures carefully, what you see is what you get. Please note we do not guarantee our testing will match your test results as test calibrations vary widely. We also cannot warrant these items will provide a particular sound or performance since audiophiles can also vary widely. We do not warrant or guarantee performance in a particular application as we do not have control of usage or application. ALL SALES ARE FINAL. RETAIL SALES ONLY - PLEASE NO RESELLERS. DAMAGE: Claims for product damaged in shipping require evidence of damage to the shipping box or claims will be denied - this is the policy of all shipping companies - you must save all shipping materials. Unfortunately associated audio equipment can damage tubes if there are system problems or improperly used. Understandably we cannot be responsible for tubes that have been damaged by the buyer's equipment or misapplication, therefore no returns or refunds for damaged items . We have had tubes returned that were put in the wrong socket vaporizing the heaters - for example. *** OUR 16th SUCCESSFUL YEAR ON EBAY! *** CHECK OUT OUR STORE FOR MORE COMPELLING AUDIO R ELATED ITEMS We want to thank the thousands of customers who have done business with us. Thank you for your business across the globe, helping us bring the finest items to all our fine customer base. We have made so many loyal friends from across the world. In this time of uncertainty, we are honored to serve you as a high integrity seller!