The older Tridents, 80 series, used a good transformer followed by good opamps with gain intelligently distributed amongst them all. If I remember, the first opamp was 5534, followed by a 071.
Simple and good performance.
The later ones, the 24's and 65 types use a transformerless input that is pretty well done too, doesn't sound as "nice" but is certainly useable. I think these are using duals, TL-072's, but it might still be single 071's. I'd have to go jerk a channel to remember...I haven't been inside my 65 for a couple of years. It's nice when stuff just keeps working, isn't it.
Helps to not buy crap, I guess.