[Charlie]

Wow that's a GROOVY looking cabinet! Kinda looks like one of those Motorola / Drexel cabinets. That is the earliest CM I've seen. If memory serves, Curtis Mathes started dealing with electronics in '57... before that they were furniture manufactureres.

My CM b&w is from '63... and the chassis looks just like yours with the exception of the 5U4 on the left... mine uses diodes. I've seen several others like in my area that I passed up because they were simply too big for me to bring home. I've noticed they usually stamped a date on the power transformer... perhaps yours is stamped as well.

That big chassis is a breeze to work on. There's lots of room under there, and the way they line up the capacitors and resistors up makes them extremely easy to change! You won't feel like you're playing "Twister" under that chassis.

Cleaning the top of the chassis will be very important as all the little tits on top are the connections from below... similar to Zenith color chassis.