You can try Andy Bouwman of Vintage Tube Services, 616-454-3467, www.vintagetubeservices.com. Andy's prices are not cheap, but he supplies the real thing, tests everything he sells and knows tubes; very honest too. I have some of the Amperexes you're looking for, but I lent them to someone from our audio society who has a Sonic Frontiers line stage and also wanted them and while he liked the sound in his preamp, he had the same complaint I did, that they were noisy (really only specific to my tubes, not this type in general); I contacted Andy for him, who advised me that he had only one left. Apparently someone somewhere must have touted these tubes, because he said there had been a big run on them. Personally, I like the older Bugle Boy 6DJ8s in my phono stage, but I'm a romantic at heart. Andy, by the way, can help in identifying other tubes of this type that might work well with your equipment. Good luck!
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