do your best to find a KT120. as long as they bias correctly you should not need to have them tested.
KT150s will not work on the CMII.
I had the CMII and tried KT88s. It was an instant downgrade- weak and dull sound. the KT120s are the real deal.
KT120 replacement options in a Cronus Magnum II
I have a "new to me" Cronus Magnum II" that came with a shot KT120. Thankfully the am still plays with half the power on the one channel. I'm having no luck finding this tube. Being made in Russia and in high demand I expect the situation to stay lean for some time. Rouge reported that the KT88’s, KT90’s, and KT77's are all compatible. I'm new to the tube amp space and I was hoping to read for a few months before going tube shopping, but I have a situation.
Has anyone "downgraded" the Magnum II to one of these other tubes? I'm guessing I should buy a pair so both channels have the same output. Is that right?
What are your thoughts for the best way forward? I spent most of my budget so a pair of KT150's is really not an option.