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Post by Control on Sept 9, 2005 13:54:30 GMT 7
amperex ecc82/12au7 (orange globe logo) amperex ecc82/12au7 (bugleboy) amperex ecc83/12ax7 (bugle boy) Sana makakuha ako nito sa Beerday ko.... ;D ;D ;D
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Post by hans adriane on Sept 15, 2005 15:49:16 GMT 7
12AX7 AMPEREX HOLLAND 1950's (long plates) (sweet and very detailed sound, very articulate and dynamic with warm sparkly tonal balance, the best for vocal reproduction)
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Post by hans adriane on Sept 15, 2005 15:52:36 GMT 7
12AX7 / CV4004 BRIMAR ENGLAND (Brimar tubes are excellent in the phono section. They are very balanced from top to bottom and have low noise and microphonics)
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Post by hans adriane on Sept 15, 2005 15:58:40 GMT 7
12AX7=ECC83 MULLARD "Ribbed Plates" NOS 1960's (12AX7 Mullard 1960's vintage have great midrange tone and bass, an excellent 12AX7)
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Post by hans adriane on Sept 15, 2005 15:59:42 GMT 7
(12AX7 Mullard with yellow printing appeared from around 1962-1965, all other 1950's - 1970's Mullard had white printing)
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Post by hans adriane on Sept 15, 2005 16:01:28 GMT 7
CV4004=M8137 MULLARD Box Plates 1970's - 1981 (CV4004=balanced and smooth sounding with excellent midrange, recommended
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Post by hans adriane on Sept 15, 2005 16:02:50 GMT 7
12AX7 Telefunken Ribbed Plates (excellent preamp tube, nice resolution, balanced, quiet, articulate, not warm and fuzzy)
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Post by tubeguy on Jun 22, 2012 1:25:28 GMT 7
TELEFUNKEN 12AX7 Telefunken produced some of the best tubes that have ever been made anywhere at anytime. They are remarkably devoid of any microphonic problems and tend to last a very long time. It is fairly rare to see a weak or bad Telefunken tube. The sound is characterized by many to be "mellow" or "dark" but really if you want to know how a tube sounds, you need to try it for yourself in your own equipment because it may sound totally different to your ears than someone else's. There are basically 2 different kinds of Telefunken 12AX7's. The "smooth" plate version has as large totally smooth plate surface. I believe that these are the earlier version. The later version has ribbed plates that look much like RCA plates. I really couldn't tell you the difference in the sound quality....like I said, buy one of each and try them both. There are allot of "fake" Telefunken tubes out there, you need to be careful. Any tube produced in the Telefunken factory should have a "diamond" molded into the glass in the base of the tube inside the circle of pins. If you don't see this diamond, then the tube wasn't produced by Telefunken. There are many Telefunken tubes out there that don't have the Telefunken name on them, but instead an OEM brand like Fisher, H.H. Scott,etc. These are true Telefunken tubes as they have the characteristic diamond in the base. This is true for other brand names of tubes like Amperex, etc. It has also come to my attention that there are some perfect "fake" copies produced in China which are difficult to tell from the genuine ones. The only way I could tell is by looking at the writing on the tube. Original Telefunken printing is very poor and will wipe off easily with your fingers or just a little moisture. For that reason, allot of Telefunken tubes are devoid of most of their writing. These fakes have very nice writing and the printing will not rub off with your fingers or water. So if the tubes you see have really indelible printing, suspect that they are fakes. While these fakes look good, they apparently sound horrible (as I have been told). Buyer Beware! As with all tubes, we offer a 10 day evaluation period in which you may return an unsatisfactory tube. . Not trying to bust your nuts or anything dude but anybody that knows Telefunken 12AX7 and 12AU7 knows the early ones had RIBBED PLATES not smooth plates. The last of the Tele 12AX7 had smooth plates and were assembled elsewhere. I know how to ID them but don't want to cause more nuttiness in tubeland. Amperex and Mullard 12AX7's looked the same because Philips owned both companies. I have Amperex 12ax7's made by Mullard. All these tubes were just fine. After Richardson purchased the Amperex name is when things get hinky. It's easy to tell a Richardson Amperex tube by the logo on the boxes. Now...on to this bullnuts about the "best" audio tubes were made in the 50's and 60's.... The 1958 vintage pinched waist Amperex 6922 was a joke. The last 12AT7, 12AU7, and 12AX7 (labeled CV4024, CV4003, and CV4004 respectively) were the best testing, quietest, lowest microphony that Mullard produced. And they were made in the 1980's!!!! Older means older. Not better.
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