Teac series 3 mixer input channel with or without mike transformer 60502921 or 60502922

This popular mixer from Teac was widely used, it had 8 input channels but to save money they

only put Tamura 60465071 transformers on 6 of them, the logic being that some channels would be used for line ins, reality is that now many people are using these as mike preamps, nice sounding unit, channels are same less the transformer and a few resistors etc, rare now

I have  now two variants of this board though they look similar