I think your NFB loop is very carefully condidered. At first the ratio looked low. But then I saw that you have it coupled from the two ohm secondary. So I'm guessing you considered ratio and tap based on something like the Super Reverb? Looks just fine.
I like to hardwire a 47pf "bright" cap and then use a 100pf on the switch. The bright switch a fun circuit for tweaking.
I've gone as small as 2200pf, but I usually use a value of 4700pf or .01uf. Just something to consider.
I am going to make some final edits and post the completed schematic in a new thread for more criticism before I put iron to eyelet. Right now I am debating using a smaller PT and running 6V6's since this is for home use. I want it for primarily for cleans but I'm sure 22 watts will be plenty. I would just use the same OT since I already have it and re-label the taps 4,8,16 instead of the current 2,4,8 to compensate. The over sized OT may help with the clean headroom anyway.
I have an 18watt EL84 build that I use for my dirt.
Cheers
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