I might suggest RCA 12au7 Cleartops..Great tube,not too expensive and great sound for the money ....Usually between $50-$60 pair ( with high test marks )........
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There is a broad range of 12AU7s in terms of tone. It really depends on what you want to achieve. Then of course how much you want to risk. NOS and in reality many are lightly used tubes are a gamble, that virtually no seller will warranty, once you have put it in your equipment. Fortunately there is a current production tube that is supposed to be truly excellent. That tube is the Gold Lion reissue. A very good vendor is over on Audio Asylum named Jim McShane. (no financial intersest whatsoever)
If you want to get something really extraordinary chase down the Amperex 7613 from the early 60s and late 50s. They are a direct sub only from Heerlen, often made for computers etc so you will find Hewlett Packard etc. branding. Super clean detailed crystaline halographic extended really special. Of course IMO.
6922s are scarcer if you want really good older tubes anyway. The prices get insane fast. One great sub that I like which is more German Sounding Than British is the Mullard CV2943. Upscale Audio has them from time to time. That's a good place to look also at others. There may be more bang for your buck if you can use 6DJ8s.
Good luck, tube rolling can be a very slippery slope.
In addition to knowing the tubes, it is good to know some of
the more trusted vendors and Jim McShane that Mechans
mentions is one of them, as is Brent Jesse who specializes
in NOS, Andy at Vintage Tube Services who is perhaps the
best NOS vendor, and Roger Modjeski (RAM Labs) who is
perhaps the very best tube tester, but tends to focus on
current production tubes. I have not heard the Gold Lions
mentioned, but their EL84s and KT88s are wonderful, so it
may well be that the folks doing these reissues know what
they are doing.
Someone on audiogon was offering Golden Dragon 6922/6dj8 really cheap. In my opinion, they are the best budget tube. Keep in mind that 6922's last up to 10,000 hours so it's easy to get your money's worth over the years.
12au7's will last about 1/2 as long but will cost 1/2 the price. I'll agree with the RCA's but like the Jan Philips too.
I am reclining in my listening room thoroughly enjoying The Rite of Spring due in no small measure to the Psvane 12AU7 Reference Vacuum tubes. I just recently purchased these new production tubes manufactured under tight tolerances in the Shuguang tube facility in China. The Psvanes replaced gold pin EH 12AU7s. The EHs were good sounding tubes in my heavily modified cj tube line stage. The Psvane's bring a whole new "sophistication" to all aspects of sound. Most notable is a complete lack of "glassiness" in the upper midrange and treble, a smoothness to the musical texture without any loss in detail. The soundstage is open and natural. Bass is powerful and tight. These tubes are very quiet, a characteristic missing in my trials with NOS Mullards. Yes, they were warm and "musical" but the several pairs I used were always noisy...losing their vacuum?
I purchased the matched pair with gold pins for $83 including shipping from Grant Fidelity located in Canada.