HockessinKid
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Jon,
Most ZMA owners posting on this forum have noted positive results with new production KT-66, 7581, 7027A and KT-77 power tubes. Given a 2000-2500 hour lifespan of power tubes and the high cost of NOS tubes, most of us have opted for new production tube quads as replacements in the ZMA.
Given our different system builds and more importantly listening room conditions it can be a toss up as to which will sound best, let your ears be the judge. With new production tubes costing $100-$200/matched quartet you can experiment to some degree without breaking the bank.
New Sensor produces rebranded TungSol, Gold Lion, Mullard, and Sovtek tubes and these are readily available from online sellers. I have enjoyed Gold Lion KT-66 and KT-77 tubes, along with TungSol 7581 and 7027A's. Also the Tube Amp Doctor 7027A's. Each tube has different attributes, so my suggestion is to try a couple sets for +100 hours and listen for what sounds best in your system.
HK
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