I built @robrob 's bassman micro circuit last year, its a great little amp and I am happy with it. But recently I've been going back to all of my old builds and tweaking things and this one may be next on my list... Today, for whatever reason, I started reading about tweed twins, both high and low power and thinking about the differences between the various cathode follower tweed amps. The bassman and tweed twins are all closely related, with differences in the number of power tubes and some preamp differences in the 5e8a. So I started thinking about taking a couple of ideas from the 5e8a and trying them in the micro bassman. Basically I am thinking about adding a switchable triode gain stage with NFB between the master volume and the phase inverter. I would remove the bright switch on my build (I don't really use it much) and replace it with a dpdt switch which I would use to switch the signal from the master volume wiper from its normal path to an extra triode gain stage modeled after the 5e8a gain stage right before its phase inverter. I built my bassman micro in a princeton reverb chassis, so I have a spare noval socket hole to use and it would be reasonably easy to find room for the extra components for the simple gain stage. I would run the nfb to this new gain stage and I would then be able to switch between a non NFB bassman preamp and something somewhat like the 5e8 preamp (though with the 5f6a tone stack). One thing that has struck me about the bassman micro is the use of a cathodyne PI instead of a LTP as in the original 5f6a. Obviously this was done because it works well with the 12bh7 power section and honestly I can't argue with the results, but that and the cathode bias are the two places where the micro diverges from the big amp. Related to this, I notice that Rob removed the negative feedback in the most recent version of his design, because not having a LTP PI meant that there wasn't a good place to put the NFB. Adding a post tone stack gain stage in front of the PI as in the 5e8a, gives you a perfect landing spot for the NFB and the extra gain stage may be a good match the cathodyne PI since that is how it was done in the low power twin. Does this make any sense, or am I just up too late obsessing about amps again?