I am not a accomplished guitar player by any means, but I do like a medium amount of reverb in my amps. Last night I changed another "8" series Accutronics tank for a "4". The short tanks just seem to have too much "boing", I know the delay is rated in milliseconds, but the longer tank just sounds fuller to me.
I changed the tank in my chinese Fender head, and now my 90's little Fender hybrid, and I think they both sound better. I have an old 70's Rickenbacker guitar amp, and a Roland rack mount tape echo unit that have the small tanks from OC Electronics,(made by beautiful Wisconsin girls), and they are as bad as the "8" series Accutronics!
Now what is wierd, I have an old single 6V6 Airline, that still has the original Hammond tank inside the little cardboard box, and it doesn't seem to "boing" like the small Accutronics, the reverb actually sounds pretty good!
I used a "9" series for my "Twin" build, as I wanted it for my steel guitar, and it sounds great with the Sho-Bud. If you play 6 string through it though, Dick Dale would be jealous, even at low settings it's really "wet".
I wonder if the tube driver and recovery in the reverb circuit really help get the sounds I'm looking for, vs the SS, or is the size of the tank the determining factor?