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In Reply to: RE: Question about matching tubes between phono pre-amp & headphone amp posted by peresmeshnik on February 17, 2017 at 19:40:58
The 6922s are not easy to find at a low price, I am afraid a real world pick would not fit into your budget.
If you want to damn the torpedoes, then look for white label USA Amperex some are designated E88CC, another fine tube is the Siemens 6922. Mullard made several styles of the 6922ranging in warmth knowing that most 6922s are not really warm, to sparkling. The tube I use is the CV-2493, Upscale Audio once carried them, they are not a budget tube.
There is an old FAQ on 12AX7s you should be able to find on this site. It concluded that 5751s were the way to go, but for a Phono pre it's probably not because of the reduced gain. Old stock Mullards are warm for the most part esp. 1950s long plate Blackburns. Philips also made Amperex, Valvo and Miniwatt. Your best buy for a British tube might be Brimar.
Follow Ups:
Thanks, Mechans, for those very helpful suggestions. I'm prepared to spend more on a tube if / when I can be fairly certain that the upgrade is sonically evident to my own ears, but I'm certainly not willing (or able) to spend hundreds of dollars on a single tube if the improvement is less than staggering. From what I can see on ebay and various online vendors (via Google searching), tube prices are all over the map, and the variety of types & brands & years & other production details are simply overwhelming. But at some point I definitely would like to try out one of the British makes you mentioned (Mullard or Brimar), so thanks again for those suggestions. And I will also search the site for the FAQ thread on 12AX7s you cited.
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