Yes, Cinemag is used fir 11.5dB gain and SiT+Mosfet is only current gain (buffer) without any negative feedback.
Its temperature is too hot with 1.5A biased and also sensitive from hum and noise from outside Chassis, AC INLET
No, It's quite different from SissySiT, I merged 2-3 version of an original SiT to get best THD, noise, and relative of K2,3
Also hard to get suitable SiT/Mosfet VGS matched from the first time (4 pairs selected for me)