UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - FRG-7 Quiet hum

AlanC · 19th Jul 2019, 10:55 am

The power supply has a full-wave rectifier (D408 and D409) so any ripple should be at a frequency of 100Hz. So maybe you still have a bad diode?

19th Jul 2019, 10:55 am	#3
AlanC Hexode Join Date: Jul 2006 Location: Sheffield, South Yorkshire, UK. Posts: 312	Re: FRG-7 Quiet hum The power supply has a full-wave rectifier (D408 and D409) so any ripple should be at a frequency of 100Hz. So maybe you still have a bad diode? __________________ Always expect the unexpected...