Audiophilepure

https://www.stereophile.com/content/air-tight-atm-1-2024-edition-power-amplifier

We feel the copper base board offers a clearer sound character compared to a polymer-based circuit board,” Miura said. “We never mount tube sockets on a polymer-based circuit board. Differences in thermal expansion and contractions of polymer and metal will eventually damage the circuit board and cause cracks, and the whole printed circuit board will need to be replaced.”

“For our tube sockets, we use a very basic plastic base with a steel-type socket,” Miura noted. They’re supplied by Japan’s Sankyu Technos Co. You might expect to see pricier ceramic versions in an amplifier at this level. “We avoid ceramic bases for tubes, as tolerance to the pin holes are not as accurate as we want. We think this happens due to shrinkage of ceramic during the calcination process. We’ve experienced ceramic bases not matching the pins of the tubes. We do use a ceramic base socket for the 211 tube in the AirTight ATM-2211 mono, which requires high-voltage insulation

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