I have a set of the Genelex gold lion kt77's I've tried them in two amps, both push pull, and find they are inferior to the similar gold lion 300b by a significant factor.
I find the top end to be rather harsh and not very extended. I'm using a three way horn system so its rather reveling in the top end. The basic Messa branded el34 is better in many ways, IMO, not perfect but for cheep tubes they work rather good over all.
Now maybe the kt77 are not broken in but I don't think they take that long and I've tried them in two amps now with the same result. I really wished they were better as I have a set of the Gold Lion 300b variants and they are stellar.
I'm now on the fence if I try the Gold Lion 2A3's in my new amps.
I find the top end to be rather harsh and not very extended. I'm using a three way horn system so its rather reveling in the top end. The basic Messa branded el34 is better in many ways, IMO, not perfect but for cheep tubes they work rather good over all.
Now maybe the kt77 are not broken in but I don't think they take that long and I've tried them in two amps now with the same result. I really wished they were better as I have a set of the Gold Lion 300b variants and they are stellar.
I'm now on the fence if I try the Gold Lion 2A3's in my new amps.