I'm looking to buy a quad set of 300B tubes (5 volt heater WE type) for a Coincident SET configuration amp. WE is out of the question due to the cost. I am considering TJ, Sophia, Full Music brands or even Svetlana.
Brian of DIY Hi Fi Supply is based in Hong Kong and screens his 300B tubes. I've also bought other tubes from him and have had no reliability issues. Not to say spit doesn't happen, but Brian will not send you untested tubes.
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