This is what we used in the Navy in the sixties - AVO Model 8.
), but I did witness the transition from crystal oscillators to VCO and Phased lock loop technology used in generating the various RF frequencies for wireless communications as well as the introduction of microcomputers built into the radios that allowed things like changing the frequency via keyboard without having to literally install new crystals!
That looks like a panel meter, no banana jacks!
Yes , these ones also had leather cases and the leads were attached to terminal posts but without the banana sockets. 2500v AC / DC terminals at the top for high voltage readings in valve transmitter final stages and radar equipment !
Since we're strolling down memory lane while waiting for Capt Y Knot to get some readings. A few years ago my coworkers and I were cleaning exhibits on the USS Missouri (Mighty MO) based in Pearl Harbor. After our chores were done the coordinator led us into the belly of the beast and we were able to crawl over, touch, and accidentally step on thousands of pieces of WWII tech. Computers the size of semi-trucks, mercury switches, bakelite galore! It was a very surreal experience and I was amazed at how sophisticated the equipment was.
Valves .. I have one piece of valve equipment that is on my bucket list to R&R one fine day, this Silvertone wire recorder, record player, radio.
