6n6p tubes and where to buy

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Advice from those more knowledgable please. I am after a matched pair of 6n6p valves. I am told the real Russian originals are the ones to get. On searching I see lots of what seem to be variants: 6h6p; 6h6p i and various others that seem to be interchanged with what I want. Where and how can I get the valves I want?
 
I have purchased from both mycomponent and uralspirit with good results. I have avoided the -i suffix, I think it has to do with impulse ratings, but can't say for sure if it operates any differently.

There is no difference between 6n6p and 6h6p.


I have heard it said that the impulse tube 6N6P-i is the progenitor of the 6N30P. I'll second the recommendation of "uralspirit"; he,Dmitriy Kolevatov,is a real gentleman.
 
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