[Amps] Source for good 572B's tubes?

[Hsu]

There is only a 572B's manufactorer in China. That means if you purchase 
Chinese 572B,even diffirence logo,but  same quality.another option ,Russian 
572B, but I heard of that tube can not fit RF service.only for audio.
IMO, maybe you drive the 572B too hard or you PA with problem.It shoul be 
with longer tube life.
   73!Hsu

-----原始邮件----- 
From: James McKellips
Sent: Saturday, March 23, 2013 6:04 AM
To: amps at contesting.com
Subject: [Amps] Source for good 572B's tubes?

Hello listers,

I am looking for a good source of 572B tubes. I have been buying them off 
eBay and these are Chinese tube. They haven't last more than a year. Any 
have any ideas, I would appreciate it. Please send email to 
w4nft at mckellips.net

Thank you and 73,

Jim, W4NFT
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