TUBE HUNTER VACUUM TUBE GEMS THESE ARE THE SPECIFICS OF THE TUBE/TUBES FOR SALE THESE ARE THE TUBE/TUBES FOR SALE: MANUFACTURER: TELEFUNKEN PRODUCTION CITY: BERLIN GERMANY TUBE TYPE: 12AU7 ECC82 PREAMP DESIGNATION: DIAMOND BOTTOM CHECKED TEKTRONIX YEAR: 1965 MONTH: NOVEMBER Date code match YES SILK SCREEN CONDITION %: 85% MICA: 2 PLATES: LONG SMOOTH GREY GM%: 124%,125% SINGLE/PAIR/QUAD/MULTI: PAIR GETTER: O GETTER DATE CODE to = NOVEMBER 1965 What does "Checked Tube" mean? Tektronix was the leader in high MEGAHZ machines. They were doing some really fast switching. Tektronix was building equipment that was on the leading edge of tube technology. They did things that required careful matching of tube characteristics, such as 18 tube distributed vertical amplifiers. Some of their circuits, by virtue of their being flat from DC to 100MHz, or so required tubes that had unusually stable characteristics. They needed the tubes to meet very high standards in some critical circuits. At times only a single manufacturer made tubes that met those standards. Because of these special needs, Tektronix had a department dedicated to testing and matching vacuum tubes. They assigned, special part numbers to these highly tested and selected tubes. These tubes were selected by Tektronix for use in critical sections of precision testing equipment. They were hand selected for GM values and balance (within 2% per section). They also were checked for NOISE. They are the lowest noise tubes you can find for the brand selected. That is what the CHECKED STICKER are all about. Tektronix was very picky about the components that went into their equipment. They made the VERY best test equipment of all time in my opinion. These tubes are an embodiment of that fact. They sound great in my headphone amp, and they will in yours! When I find these CHECKED tubes (which is very rarely) they are always very tightly matched and have THE BEST sonic qualities. Telefunken 12AU7's are reported to be at the top of the audiophile food chain when it comes to sonic reproduction. They are very honest in all frequencies. They are the finest in delivering the highs with transparent open air at the top. Perfect mids with near perfect vocal presentation. The bass is punchy and not muddled in any way. These tubes are consistently the LEAST microphonic of all tubes. Here is what Brent Jesse says about these tubes: "These tubes are usually characterized by an impressive open "air" at the top end. The soundstage is large, even in mono applications these tubes have a great 3-D image. The midrange is ruler flat, and the bass is tight and accurate. For phono grade and critical high gain applications, the Siemens Nickel Plate and the Telefunken smoothplate or ECC802S are awesome. These tubes have a fine sense of dynamics, and most are impressively quiet. These are not "warm" tubes, and to some ears their lack of midrange warmth may be heard as bright. I tend to think of them as accurate, and their clean, focused sonic image is astonishing. My personal favorites." These tubes test NOS, and will blow your socks off! On my tester a B&K 747 tester: Below 55 = BAD 55-66 = ? 65 -100 = Good 100-120+ = NOS I PERSONALLY purchase, clean, identify, test, and stand behind every tube on this site. I have a small company. You will deal with me personally. I want to see you happy with your purchase. I will never sell a tube that is below standard……I destroy those tubes. I will not sell a tube that I feel will not last or has been abused. I have sold many tubes here on Ebay, and all my customers have been completely satisfied. I will work with you in good faith if there are any problems, or if you are unsatisfied in any way. I want your business now and in the future, so I assume you are the boss, and I am the employee. All tubes are tested for shorts, continuity, and emissions. Domestic buyers I always ship UPSP first class small package no matter what it says in the listing. I prefer PayPal. Fine Print: ALL CUSTOMERS PLEASE READ ALL NOTES BEFORE BUYING FROM ME !! 1. RETURNS: It is my highest desire that you are completely satisfied with your purchase from me. I will bend over backwards to make sure that you are a happy customer. If anything you buy from me is less than satisfactory, message me BEFORE you either open a case or hit the “item not as described” button. If you want a return for any reason, I will give you back 100% of your purchase and any shipping you paid. 2. PLEASE NOTE: Tube silkscreen (lettering on the tubes) is VERY fragile. It can be wiped off and destroyed VERY easily. If you wipe off the silkscreen while handling the tube you diminish their value by up to 70%. DO NOT handle the tubes or hold them from the cylinder. ALWAYS hold them from the ENDS. If you are returning tubes and they are not in the same condition cosmetically I cannot give you a full refund. THIS IS VERY IMPORTANT. 3. UNLESS YOU MAKE ARRANGEMENTS WITH US BEFORE YOU PURCHASE, YOU MUST PAY FOR ITEMS PURCHASED WITHIN 2 DAYS OR A CASE WILL BE OPENED FOR AN UNPAID ITEM !!! 4. Please note: The numbers given for gm are what I see on my tester. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester. I don't guarantee or imply anything else. International customers note: 1. Please wait for us to invoice you for the correct amount. If you have purchased more than one item and the total exceeds 100.00 USD. We have to ship those items USPS priority mail. The cost of shipping for items over 100.00 is 39.95. That is the exact shipping cost for an international priority box. 2. Under no circumstances will we state on a US customs a declared value of less than the sale price. This is an honesty issue. We are honest with everyone to the best of our ability to do so. We want you to trust that what we say is true. There cannot be that trust, if we make false statements knowingly to anyone. If your country has tariffs/taxes so high that they cause large numbers of normally honest folks to make false statements, we urge you to work for change of those laws. 3 International buyers if you bought more than one item and want combined shipping it will ship in 2 days. FREE! Sellers: Add a FREE map to your listings. FREE! Every buyer gets a MyStoreRewards invitation for cash back
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