it all on the
http://dynatube.creamware.com pages...
AG=Dynatube AG is modeled on an Ampeg V-4BH bass guitar amplifier with two 12AX7 tubes in the preamp, and two 12AU7 and six 6L6 tubes in the poweramp. The plug-in also includes a simulated Ampeg SVT 4x10" speaker cabinet, the sound of which was captured with a Sennheiser MD421 microphone.
SW=The original Simms-Watts PA100 bass guitar amplifier the plug-in is based on has three ECC83C tubes in the preamp, and four EL34 tubes in the poweramp. Dynatube SW also features a simulation of an Ampeg 1x15" speaker cabinet, the sound of which was captured with a Sennheiser MD421 microphone.