I A/B'd with a friends awesome original 1966 fender twin reverb with the altec speakers. Now, I run my mark III through 2 theiel/ev cabs, but this was what I came up with...
vol1-4 pulled
treb-5
bass-3
middle-5
master-7
no EQ
reverb 10
presence-7-9 depending
Simulclass!! Or at least 6L6 in outer sockets....
I also found that turning the bass to 0 pulled, and pulling the "deep" adds a fat "honk" to the tone... Think Stones...
These settings with my USA "fat 50's" loaded strat. With the delta tones, you may want a higher treble setting, maybe 7, but no more.
Here's the kicker, turn up the presence to 10, and push the front with a good tube screamer, and you approach SRV tone!
Good luck!
ax. 8)