There’s not enough gain there for the NFB to do much good. Run it back to the input stage.
The added negative feedback is intended to reduce the output source resistance a bit. Considering that the typical speaker system has one or two percent distortion at lower volume levels, increasing as amplifier power increases, there is no point in trying to get amplifier distortion ultra low, vacuum tube or solid state. I probably will not have time to try any amplifier mods for a while. I'm busy getting a chassis ready for an experimental amplifier using 6SN7s as output tubes. When I do, I'll start a new post about it.
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