Some fun facts:
- Although called the Five Hundred, the transmitter actually operates at 600 watts DC input on CW.
- The literature refers to it as "the Five Hundred", using words rather than numbers, for some reason. Note the front panel lettering.
- The 811As in the modulator section are operated with 2000 volts on the plate even though the data sheets say 1500 volts is the maximum plate voltage for 811As. During development, EFJ contacted RCA and was told the bias arrangement in the Five Hundred was such that 2000 volts on the plates was OK.
Hope you find your Five Hundred. According to information published in Electric Radio years ago, only 865 were made.
73 de Jim, N2EY