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So far I have tried circa 1972 JAN GE 12AT7wa which were pretty decent. currently I am using early 60's Telefunken ECC81's and they seem really good on the top end and nice in the midrange but a little soft on the bottom end.i am open for suggestions of a well rounded tube to use in this particular circuit. thanks, William
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I like the Telefunken 12AT7, but the RCA 12AT7 black plate are better in my system.
You are relatively fortunate in wanting a 12AT7 or ECC81 etc. These 12--7 tubes are easier to find in good shape and with a wider variety than other 12--7s. Since prices are relatively low in general for good old stock, you would be doing yourself a favor by educating yourself by rolling as much as you care to.
The type of sound you like may be present in any number of tubes but you should really try the anti-Telefunken, for educational purposes, which is the made in Great Britain, Mullards. Mullards are described by most as being warm with a mellow bass and some say rolled off treble. I didn't always find a slow syrupy tube but you might run into one. Some say the holy grail AT7 is the Brimar Trustee sub brand model 6060, and you can find these. I don't think the 6060 was all that special but you really have to decide for yourself.
Steve
Do these look the same ( no affil. ) as the Mullards your talking about? If these are what the seller says, I would imagine them a pretty good buy!?
Those tubes do not look like the mullards I have run across or own but realize that the short plate structure is typical of 12AT7s. The best way to tell is to get the "acid etch" codes on the tubes. They tell you where the tube was born and more. A true "Mullard" has a code in the glass, the other markings on these tubes have been washed off except for one which is a rebrander Zearix which may or may not be te real deal.
Steve
I found a quad of very strong tested 1953 RCA 12AT7 D getter blackplates to try. in another month I might get a quad of Mullard 12AT7's from Upscale Audio and see what they are like.thanks,William
Telefunken in general seem to be known for their top end! One of the best AT7's I've used is some RFT's I got from Jim McShane some years back! I was just perusing Ebay (no afil.) & 12AT7's seem to be pretty reasonably priced. My suggestion: buy some more tubes & roll!
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