According to FCC documents. WQAM used a Continental 315-B 5000 transmitter operating at 5000 Watts daytime and 1000 Watts nighttime. A flick of a switch made the changeover and was easily heard on the air when listening at dusk and dawn.
The picture above is a photograph from the Manual of the Continental 315, 5 kW. Transmitter and should be similar to WQAM’s. Courtesy of www.oldradio.com
315's and 316's on the production line in the late 1950's (C.E. sales brochure) Courtesy of www.rossrevenge.co.uk
Hopefully, someone will provide an actual photo of WQAM’s transmitting equipment.