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RE: Grant Fidelity/Psvane tubes

I just had a somewhat different experience buying a quad of highest grade Psvane 12AT7s. They all tested very strong in output but three out of four of them were highly microphonic. I e-mailed asking if I could return them, and said in the e-mail that I appreciate the lengths they go to in assuring the quality of the tubes they sell and that the many Psvane, Treasure and Shuguang tubes I'd bought from them over the years were all excellent (which is true). I got an immediate polite response, they agreed to send me a new quad (I had to mail the ones I had back to them), and they said they would do an extra round of checking to make sure I got quiet tubes. You might start from scratch with a polite e-mail asking if you can send your tubes back in exchange for new ones (not just get a new set) and mentioning your satisfaction with your 300Bs, and anything you may have bought from them over the years.

The team making the Psvanes has broken away from Shuguang. I wonder if some loss of facilities or other factor has reduced Psvane's quality control and Grant Fidelity is itself being flooded with problem tubes. Even so, they should be able to cull out microphonic tubes - a fingernail tap was enough to test my bad lot.

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