Hi Lousse,
thanks for sharing these.My first guess would be that the extra pot
is a Ratio control, or maybe OD entrance trim.Seems that the first filter
cap was moved and replaced with a radial type.
Also intersting that the PI tube was changed to a 12 AX7 from the original
12 AT 7, something that was the topic of discussion here some time ago.
I wonder if the PI circuitry was changed as well.
Cool stuff, these pics
A trim for the FET is a good option as Lindley was complaining his ODS sounds good with lap, but not so good with guitars cause he was changing too often...
I guess a FET trim will help him switching between the silvertone, to the vox and then back to the supros... (In the studio)