Crazy Bill the Eel Killer
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Hello JJ,
The 6n15 varieties are SV83 types, while the 6n14 varieties are EL84 types. In most instances they are interchangeable, but they are different tube types, the most noticeable difference being the screen grid on the SV83 types are much more fragile than the EL84 types, meaning you cannot use the SV83 types in a UL configuration, which of course has no bearing in this application.
The two tubes have a different " house sound ". To my ears, the SV83 sounds a little faster and lighter in weight, while the EL84 tends to be a little more lush in its presentation. They will both work just fine in your amp. I would buy a couple of each and see which you preferred. Just make sure that whichever you buy carries the -ev or -eb suffix, as these are the military versions and are superior tubes to the normal varieties.
Cheers, Crazy Bill :)
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