New build for myself - Fender Deluxe/Bassman blend

[Helmholtz]

Global NFB only has an effect if it wraps around some gain.
A split load PI has a gain below 1 and the power stage gain is just above 1.
So apart from the DC/loading problem, the NFB won't make a difference.
The circuit shown in post 14 takes care of that by an added gain stage.

Another example with a split load after a gain stage would the 80s Fender Super Champ, but there are many others.
In fact, any tube power amp with a split load PI and global NFB needs to have an extra gain stage.

[gui_tarzan]

That is an interesting circuit using the 6C10 but it does exactly what you drew on the other post. There is so much more to learn...

[Helmholtz]

That is an interesting circuit using the 6C10 but it does exactly what you drew on the other post.

Yeah, just one example of many.

So if you want to use global NFB you either need the gain stage before the split load PI - or use a LTP which provides enough gain for NFB by itself.
In either case total gain with NFB will be somewhat higher than with your existing circuit.

[gui_tarzan]

Gotta put it down for a few days, other things have come up.