Look at schematics of both supplies here on nostalgiaair. Both radios use the same tubes and voltages. Radiola 18 power supply has the speaker choke. In 17 a transformer is used on the amplifier chassis.
Alignment of the terminal strip will be different. The bottom 6 connects are the same in each radio, filaments.
http://ww3.nostalgiaair.org/schematics/RCA/_RCA_1-15.gif
Norm
: I have a Radiola 18 with a bad power supply. I also
: have a Radiola 17 power supply in working condition.
: Does anyone have detailed instructions on how to mate
: my good Radiola 17 power supply to the Radiola 18 chassis?