Well, it does have a long and a bit convoluted history. John can give you the details on the early history when it was developed in the early-90's. Basically, we at Suhr Guitars took over the manufacturing and distribution of the OD-100 in 2004 since John designed the OD-100 and the 3+SE preamp when he was working for CAE and Bob Bradshaw. Bob wasn't interested in building and selling amps, so the OD-100 sort of languished under the CAE umbrella when John left CAE to join
the Fender Custom Shop in 1994.
When Suhr Guitars introduced the OD-100 in 2004, there was only one basic version that was initially called the OD-100SH (for Scott Henderson). It was basically like the original OD-100 with a different clean channel voiced for Scott. Since then, the OD-100 has evolved into various versions based on artist and customer tweaks we've been doing since 2005. Here's the lineup:
OD-100 Standard Plus (5881 power tubes - aggressive and open sounding)
OD-100 Classic (EL34's - CH2 OD channel based on Landau's early-70's Marshall head)
OD-100 Classic Plus (Like the Classic but with more gain on CH2)
OD-100 SE Plus (EL34's - based on CH3 of the 3+SE preamp - saturated gain with more compression) The new SEPlus with WhompII is very tight and fat.
OD-100 ML Plus (built for Landau - like Classic Plus but with 2 switchable gain controls on CH2)
PT-100 (EL34's - built for Pete Thorn - based on the Std Plus but with a brighter and more aggressive CH2)
An option we can add on all of the above models is two-gain and two-master controls for CH2, effectively making the amps a three-channel version although the EQ will be shared between the two.