The R868 is labeled R4868 on the schematic and is a 2.2 ohms @ 2 watt
wirewound resistor.
The R4124 is listed as a .22 ohms @ 2 watt wirewound resistor
I have 4 .jpg images of the related schematic sections and board
positions for you at this location. Go here to view/download.

http://personal.bellsouth.net/r/m/rm502/

I have the RCA service data CD on this chassis if you need more info

Robert McPherson
Telephone (502) 367-9324
Cellphone (502) 298-6997

Email