Old School marine band radios ran something like 25 watts plate modulated AM and came out of the box tweak & play for the low end of 2 MC's. Plug in your antenna, then adjust the rear panel 'tune' condenser for maximum brightness on a neon lamp. Raytheon and Kaar were popular, among others, and the RX could also tune AM broadcast. TX was strictly rockbound.
You don't see 'em at the fleas like you used to...... 13.8 VDC and kinda' heavy on the current rating thanks to the heater string.
As a general rule they were reliable and built to last.
I had a Sonar 2 MHz marine bander that I sold for this very purpose. A ham was going to re-do circuit for the 160M band. It was in serious need of a restoration. I did not have the space for the antenna, or I would have done it. Built like a tank.