Rolling KT150s in Primaluna hp integrated

tubegroover,

I appreciate exactly what you are saying.  I think the KT150s are super musical. They are as close to neutral in coloration that I've heard in power tubes.  

Like I said…not sure why but in the amps I used them in (a factory upgraded Jolida 502P, and a Dennis Had "Inspire Fire Bottle" single ended thing) they were too similar to the 120s…since I sold the 150 quad with the Jolida amp I might still try a fresh pair of 150s at some point, but for the Had SEP amp I still have fresh Gold Lion KT88s, Sovtek KT88s (Which are sort of great sounding) and new KT120s…so I'm in no hurry I guess.

If you do go back to the 150s Wolf, try the cryoed, not too much more, less than 400.00 for a matched quad. Got them off a vendor on eBay. They biased very close, very nice tubes. I also have a matched quad of Russian Genelex Gold Lions I originally purchased for my MC-60 amps, few hours. Also tried in the Silver 88s. The uncryoed 150s had more everything, at least in those amps. The cryoed  150s caught me completely by surprise. I offered to lend to a friend to hear in his amps but changed my mind after I put them in mine first. He's getting the other ones.   

I'd love to be part of a "tube lending cabal" as I'm not sure the cryo process is a good idea for tubes but that's maybe just me…the good news is my "Fire Bottle HO" will accommodate a lot of different tubes and only needs 2 power tubes…anything from KT77s to paper towel cardboard, Fee Waybill, and Kelly Slater's wave machine.

Wolf, you are lucky and or smart. The primaluna’s 8 power tubes make cost of rolling prohibitive.  

I have tried

KT150s
KT88s
EL34s
7581A

i really want to try 6550s, KT77s and KT120s someday.