Questions on KT150 tubes

I have a pair of Quicksilver Silver 88s using the Kt-150. I bought a quad of Genelex Kt-88s for use in a pair of McIntosh MC60 amps I also have on hand. My thinking after having the Kt88s was "why not try in the Silver 88s to compare with the Kt150s?"  Look, Mike Sanders, designer of the QS hands down prefers the Kt150 over ALL outputs that can be used in his amps. I say the KT150 is HANDS DOWN a much better tube in all respect to the Genelex in direct comparisons in the QS amps. I can't speak for Primaluma but expect the results would be similar, it's a better tube more plate current, more power more EVERYTHING.

Realist all I can say is break down and purchase. I find it extremely unlikely that you will not be satisfied. You want BODY, they'll definitely give you that and a lot more.

Not just ARC Wolf, all manufacturers' charge more for tubes. Sure don't know why this is so other than their parameters may be tighter and more rejects? In any case the difference between 100.00 a tube and say 150.00 from the manufacturer sure doesn't seem to warrant paying the difference as long as they are close. Is 300.00 a set for a quad, 2 per channel? I typically see for about 100.00 each from tube vendors.