after arriving from Sahkalin, in 2010, jopet sold me a quad of Shuguang EL34's,
i made a pp amp out of that and was exhibited in Dusit hotel....then after that,
i built two 2A3 amps using the Shiguang tubes....
the experience changed my mind about china tubes...
the shuguang el34's survived months of abuse....
i think that to generalise that "china tubes are junk" is unfair to say the least....
i still hold the belief that it s not the tubes, but what you do with t that matters...i have high respect for Russian tubes, working as a QC/QA engineer in Russia for six years,
i know the work ethics of Russian inspectors, they can not be forced to sign reports
unless they are very sure of quality, reason being, they can go to jail if a product
bearing their signature fails due to quality.... and russian tubes have traceability,
they can track whoever signed a defective tube...
so what am i saying? generalizations are usually self-defeating....