Thanks for the offer of the modules and all the info! In my dim memory I was thinking that the orange cap was indeed the replacement version, glad that's one less thing to worry about!

Won't be able to dig further into this set until after Christmas at the earliest (is in storage right now)....in the meantime I'll try and locate a Sams for it. Got a line on another color Zenith, 1969 vintage original owner family, also for free!

Anthony