Back to the build! First off, a big thanks to Tim for supplying replacement audio and vertical output transformers for this set!
Got started on the first PCB assembly, the Sound module. This module implements essentially the entire audio section, with the exception of the chassis mounted power output stage. It contains 2 transistors, one IC, and a ceramic 4.5 MHz IF filter.
Most of the modules in this set use tubular contacts on the PC boards, which mate with pins mounted on the chassis. Construction begins with the installation of these contacts, which insert into 2 rows of square holes along the top and bottom edges of the board. A plastic alignment jig that resembles a lego block is placed over each row of contacts, the contact tabs are bent over to contact the foil pads on the board, and the tabs are soldered down to the board. Once the soldering is complete, the alignment jig is removed, leaving a properly spaced, straight row of contacts. The kit provided a long length of 3/16" diameter black PVC tubing, which is cut into short lengths and slipped over the contacts to provide protection against shorting adjacent pins. The provided tubing was pretty sticky and in poor condition from plasticizer breakdown, so I substituted some red heatshrink.
The board is then stuffed in stages, starting with a jumper wire, followed by the resistors, IC and transistor sockets, capacitors, inductors, and the IF filter and coil. Finally a short 2 -pin cable is attached, and the semiconductors are installed in their sockets, completing the module.
Next up: The Luminance module.