If I may on your behalf Bruce...
It's one of mine - #3 to be precise
It's in a BG pine combo cab and it's had the following tonal mods (which will effect the speaker discussion)...
Reduced Excessive Bass:
1. Changed the V1 cathode bypass cap from 22uF to 4.7uF. This lifts the signal floor up from around 12Hz to 50Hz or so.
2. Changed PI coupling cap from .02uF to .001uF (the typical value in bigger Blackface amps). This tames the low end considerably making the Bass knob range more usable and the amp tighter at higher volumes.
Reduced Blocking Distortion:
1. Installed a 470K grid stop resistor to the grid of the Cathodyne PI.
Reduced the value of the Reverb mixing resistor:
1. Replaced the stock 3M3 resistor for a 2M2. This tames the reverb a bit and gives the amp more gain.