Kt120 Vs kt90 Sound characteristics

The 90's came with the amps.

I used Gold lion kt88's sound great Smooth great mids, but the Bass is not even and the highs are attenuated somewhat, going back the the Kt90's was a god send.

Wondering if the Kt120 is more refined or just more forward ect.

Rogue amps

Have you considered contacting rogue to ask them what the sonic profiles would be on those two tubes? I have a PrimaLuna Integrated and use KT 150 power tubes. I did try KT 120s and found them to be too clinical for my taste

If you wish for good bass, smooth highs and a rich midrange, try KT77s. I auditioned the Cronus Magnum 3 at home with the stock KT120 and found them a bit clinical also. So I ordered the amp with Gold Lion KT77s installed from Rogue. If you choose KT77s you’ll need to reduce the bias from 35 to 30 as per Rogue.

The KT 120 tubes in the Cronus Magnum gave an authoritative sound but there was always a bit of grain in the background which I did not get with EL34’s. At the time, only Tung Sol made the KT120  tubes but there may be other manufacturers now.  I didn’t care for them.  I sold the amp after a year and a half as it wasn’t what I thought it would be.  I was disappointed.  I wanted a more lush midrange with better bass and no grain.