Based on Pete's reply, since he was around when Triad was actually selling ham gear and I'm pretty sure I wasn't, I did a search of the "Boat Anchor" website, BAMA (http://www.bama.sbc.edu
), which lists more old ham gear than any other single place, and I couldn't find this one. They did list a Utah CW transmitter from 1937 (!), but that was the closest thing I could find.
You might contact Electric Radio (magazine) to see if anyone knows about your amplifier. From what Pete says, it's a relic, probably from the 1950's or earlier, and of value as an antique more than a working piece of equipment.