Hi,
Some Chinese tube factory's web site:www.sanle.com.cn,all 3-500 are made by
them,they mke 833A too.
www.hg777.com, thet producted the best 833A in China and many metail-cermic
tube morthan 400kw, http://www.jingguang.com.cn/About.asp they producted many
HF and microwave cermic tube , now, many EIMAC's tube are OEM buy them.
www.tube.c om.cn ,they producted 811A and 572B.these factory are all very
large .thety made tube for morethan 40-60 years.
73!Hsu
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