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

[KA4INM]

   On 03/22/13 18:04, James McKellips wrote:

> 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

   I think it is time to measure the Voltage supplied at the filament 
pins with an accurate meter of some kind and that means true RMS if it 
uses an ac supply.  RF parts?
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.