This beauty was recently serviced and is chalk full of that late Plexi era/early metal panel goodness... circuit is beautiful and transformers are all original and most interesting of all, there is a handy switch added...

This '69 Superbass plexi panel amplifier has stock WIMA tropofoil caps! This has been observed on several other Marshalls (as well as Park amps from same period), and totally adds a Vox influence! ...actually not, but...