Greeting, I have a '62 Tremolux head that has been modified and need some help in figuring out what they are and there functions. The ones that are obvious is the tremolo jack has be replaced with a pot. and it has been converted to EL34 tubes. Inside the chassis, and only accessible by removing the chassis is a mini pot wired to the intensity control for the tremolo. Hope the pictures help out. Any information would be greatly appreciated.