That sounded great. As for the TC-50 sounding anything like that, not really sure if it can. That ED had more definition in its tone and gain characteristic. As for preamp tubes, nothing will make a difference in the V3, V4 positions which is the Hi/Lo preamp section. The only preamp tubes that have any effect that is noticeable are the FX and PI positions and that is not much to work with. However, if you venture into a set of Gold Lion KT77, Tung Sol EL34B, EH 6CA7 or Ruby EL34BHT. You do get into a different gain structure. The KT77 did have more midrange if I recall correctly. However, once you change the power tubes to those listed, you loose the characteristic that made the clean channel desirable. That being said, the Triple Crown has its own unique pre-defined tune that is not affected by preamp tube swaps. Sure the hi/lo preamp is very similar to the Royal Atlantic in some ways but different in others. The TC has a few op-amps in its design that that make it difficult to take advantage of preamp tube characteristics. I tried rolling in the same tubes as I have used in the RA and nothing would make much of a difference. As for the ED, the hi/lo gain section is more of a Stiletto /Marshall blend. Instead of the Recto 39k cold clipper resistor, it has a 10k (more traditional Marshall design). That may be why I have some interest in the Electra Dyne.
A JAN/GE 12AT7 in the V5 may help a bit but will not affect the tone of the amp. Only way I could get some difference in drive and tone was change in power tubes. Even an GEQ in the FX loop may aid to some extent. The same could be said for the TC-100. Sorry I do not have a solution for you regarding the TC-50.