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Buying tubes...do they vary???

Been posting about degrading tubes. Thinking I'm in need of new.

Sites like thetubestore.com and the tubedepot.com are out there. I spotted Electro-Harmonix 6550 tubes on thetubedepot.com. By name these are the same as the ones I have in my Conrad Johnson Premier 12 mono block power amps that Conrad Johnson sold me.

Would they perform just the same? You would think so but perhaps I'm missing something. Also, a suggestion of where to buy replacements would be greatly appreciated.

Certainly need to get the performance that I got when I bought those Electro-Hamonix from Conrad Johnson at the end of the day...

Thank you!
Randy

rbschauman
twoleftears's avatar
twoleftears
5,327 posts
 

Another recommendation for the "usual suspects":

Andy Bouwman

Brent Jesse

Jim McShane

TC Tubes

Post removed 
cleeds
6,272 posts
 
elizabeth
Then you get into NOS where the stock ALL used, just not worn out.
Oh no, not if the product is properly labelled. NOS means "New Old Stock," not "slightly used old stock."
Post removed 
hifiman5's avatar
hifiman5
1,836 posts
 
 I guess I always thought these supposed caches of 1950's etc. tubes were mostly slightly used tubes that tested out as basically new stock.  The thought that all of the modern tube vendors could have such a wide variety of NOS tubes in such numbers in stock is rather unrealistic.  Perhaps those valves should be called SUNOS.
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