for this application. Some list members have suggested that it's back resistance is. not high enough for the application. My experience using it for a similar 51J mod. bear this out. If you used 1N270's, I'd switch to 1N4148's. Notes follow: Credit for these AGC mods for improved SSB goes to Dallas Lankford and H. Cornelius (Hollow State News ... 74HC4046AD,652 distributor.number 7941877. Nexperia. Phase-locked loop with VCO RoHS: Compliant. Nexperia. 74HC CMOS, SMD, 74HC4046, SOIC16 RoHS: Compliant Min Qty: 1 Container: Each.