Conar Model 500 (2r) Receiver Modifications
Portions of this page was originally hosted by WD0HCO and then later by AF4K. AF4K is now SK and I will do my best to continue to host the information, although not in its' original format.
Receiver hum reduction:
1. Replace rectifier D1 with a full wave bridge (FWB).
2. Add additional filter capacitors in parallel with C14a and C14b.
3. Install lower profile speaker and isolate.
4. Replace 1/4" TS with 1/4" TRS, tying tip and ring together.