How important, or rather, how unimportant, is the small amount of feedback on the F1? I am looking to build one, but I wanted to use input transformers rather than the input caps. In order for this to work, the gates of the two FETs must be at the same potential. This means biasing them from the same voltage, which means biasing from B+ (a resistor divider to set the bias point then connect to each gate via a 500K resistor) rather than their own drains, thus removing the feedback. I have done this on other designs (diferential followers) and it works fine, but I thought there might be something sneaky going on with the F1 that could lead to unanticipated issues. I'll still bias the tail CCS from the drains.
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