I came across a little black "cube" about and inch thick and 1 x 1.25 inches
on the sides. The top is pitch black and the bottom is gray with four
tinned leads. The top is stenciled PH-7. (Philbrick?) Because it's somewhat
conical and rounded at the top it looks like it might have been cast in an
old style ice cube tray. Google doesn't help so I wonder if anyone out
there has an idea?
tnx
hank wd5jfr