I apologize for the video. I found out the reason why the TC-50 was much more prominent in the upper frequency range vs the TC-100. I had replaced the V3 and V4 preamp tubes early on as I had issue with one of them but could not pinpoint which tube was at fault. The issue was a pinging noise when changing channels between CH2 and CH3 or from CH1 to either. Typical sound you get when a preamp tube is on the edge of going microphonic. Also my bad in selecting a preamp tube that was used (probably was harvested from the Roadster and may have been in a cathode follower circuit). Need to take more care in what is done when pulling used tubes. I did have a fresh stash of Mesa preamp tubes so I replaced both V3 and V4 with new tubes. Amp is very much on par with the TC-50 tone wise and character. Not sure if it would be worth doing a better comparison video of the TC-100 or the TC-50 as there are a few of them already. Also doubt I would be able to capture the tonal differences with the gear I have in respect to the dryness of the TC-50 vs the wetter tone of the TC-100 (wet being the saturation level of the midrange). Either way you go, TC-50 or TC-100, they are both great amps to have. The TC-50 is surprising as loud as the TC-100 in all respects at least with the Vertical 212 cab in use. There is a difference once you begin loading the outputs. If you are one who must run a full stack or prefer to have two cabs in use, the TC-100 will deliver quite well and more so than the TC-50. A single half stack or 412, not an issue with either amp. That will definitely bring out the full potential of both. I am also finding out new tricks especially with the presence control on the blue channel. I was keeping it set rather low but if you back off on the treble control and raise the presence it will help to define the distortion characteristic more than I thought even though it is not a negative feedback control like it is with other Mesa amps. This is simply a high pass filter designed to roll off the upper harmonic content above hearing level. Sure the effect has the same function but it is not used to cancel out the upper boundary of high order harmonics at the phase inverter as this is generally where the negative feedback is introduced as it is supplied from the speaker side of the OT.