I had a few of those modules as a kid; got 'em from Lafayette. Code
practice oscillator, wireless mic; even had one with a tuning control
sticking out of one end that was an aircraft band converter; you placed it
next to your AM radio and it would bring in airband on it!

I'll look through my old catalogs and see if I can find 'em, but I'd bet the
PH-7 is either a phono preamp or a wireless phono oscillator.

John


David VE7ETI wrote in message
...
It sounds like a diode bridge - I've seen a sqaure shiny top and
translucent grey molded underside with 4 large trinned leads that have
holes in them, but, usually, the have a hole through the centre to
bolt it, upside down, to a heat sink. FWIW....

On Tue, 23 Dec 2003 15:32:06 -0600, "Henry Kolesnik"
wrote:

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