從影片中可以看到真空管怎麼製造的。絕大部份的流程都需要人工，不是自動化產線可以完成的。這也是OSA認為「工藝(craft)」不同於「製造(manufacture)」的要素之一。
This video shows how vacuum tubes made. Even though that's not very "HIGH" technique, also you can see parts done by hand not machine. Oriole Sound Audio believe that's part of the reason why CRAFT different from MANUFACTURE is.
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