Phil Witt wrote:
There was a company, forget their name, that used to package simple
modules like you describe. Like audio amps and the like. The package
was just a clear plastic with a piece of paper closing the top. Seems
like the pins were stuck in a square of styrofoam.

You guys are triggering my failing memory. I vaguely remember these
things...something like a black ice-cube with a little wires coming out
of them. Price was something like $1.29-$2.59. I'm struggling to think
of where I saw a magazine article about ho-rigging about three of these
together for something like an AM broadcaster or some such gizmo.
Woulda had to be PE, EI or R-TV-Experimenter in the mid-late 60s since
that was all I had access to.

-Bill M