AJ, for those interested, here is a photo of a RCA-50F RCA-BTA-50F transmitter, the same model used at KAAY during the 60’s and 70’s. This transmitter was retired and replaced with a Harris transmitter in the 80’s.
KOMO Seattle – RCA-BTA-50F transmitter
(unknown source) The transmiter was so big you could walk inside several of the cabinets!
This door opens to allow access to the power supply control section. All doors were interlocked
To shut off power to prevent accidental shock.
At full power the power supply produced about 10,500 volts DC .