I had the most annoying high pitched buzz coming out of my C-J PV-12
for years. I sent it back to C-J to see if they could solve it (rubber rings around tubes) which didn't help at all. I finally contacted Kevin at Upscale Audio & he knew exactly what I needed, a pair of Mullard CV4003s. My system has never known such a low noise floor. I am v. happy. Thanks, Kevin.
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