[ke0me]

Thought I would try to mix two topics in one post in classic ORR.net style.

We visited the Graveyard of the Atlantic Museum at the southern tip of Cape Hatteras this week. Admission is by donation, and a worthwhile stop.

In case you were not aware, the shoals off Cape Hatteras claimed more ships than just about anywhere on the US coast. Hence the need for the historic 200 foot tall Cape Hatteras lighthouse.
The museum has quite a few different kinds of exhibits from a mockup of the USS Monitor turret (which sank off of the cape) to a collection of SCUBA tank types.

The radio part, they had an exhibit of the first marine radio telephone units, along with a schematic.

As far as I could tell, it used those transistors with heaters that glowed with strange designations like 6L6, 809, etc.

I amazed myself that I could still determine the oscillator, modulator, PA sections.
Guest I haven't forgotten everything yet.