Regardless if they are genuine or not, your PSU is broken by design if you think passing 41A through 3x 2N3771 in linear operation.
Why is that? They are rated for 30A max and I will drive them at less than half their max power. There is such a project here
https://www.hobby-machinist.com/threads/a-complete-13-8-volt-50-amp-power-supply.63178/ with 4 of these though.
By the way, my transformer measures 14.2x11.4x13 centimetres in size and the secondary wiring in it is 4.14mm. Would this be capable of 41A?
Even 4.5A per 2N3055 is way too much unless you are dropping like 7V volts maximum on transistors which are mounted on a large heatsink.
The old PSU was marked as RMS (made in Italy company) K1540, which might mean 15v max 40A, or maybe not.
I cannot measure the output voltage of the transformer right now, but I could tune the PSU for 14.2v (I did not try further) if this tells anything to you. It was working ok for months, then suddenly the fuse was blown. I have not yet figured out if any transistor is fused or not btw. 41A were drawn in peak, allow me to say (SSB operation) so yes, maybe on CW it would not have the guts. However, I never left the two heatsinks to go very hot, I installed a blower to it and they were always cool. Also, when the PSU was broken, the PSU had just been switched on, so I had not drawn excessive current before failing. these are the hints on this problem basically.