Requires Q7800F1004 Subbase with RM7890A1015. RM7840M1017. Refer to Primary Cross-Reference section to select proper voltage, frequency, and timings. Select R7847A1025, 1033 or R7847B1023, 1031 Amplifier. JR2 must be clipped when using 3 second amplifier. See Modernization Wiring Information section. EC7890A1011 RM7890A1031. RM7890A1015.