Hi Doc, I think a lot of guitarists may have used Fender Bassman's for guitar last century as they had a bit more bottom & midrange and I did a similar thing with the ancient Marshall head I had. An amp tech back then had a look at it and compared the difference between it and a Golden Tone he was using at the time and the main differences were in the tone circuit. Not techy enough to remember exactly what but there was stuff all difference other than my old Bass head didn't have a master volume to help drive the pre amp section.