Some of the Russian tubes are well regarded as replacements in high end audio amps...Here are some Svetlanas
http://www.zzounds.com/item--SVE6L6GC
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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming ...."WOW! What a ride!!!!!"
LUNCH with THEOLDMAN...On a break for now...