Champion 860 that intermittently squeals - UK Vintage Radio Repair and Restoration Discussion Forum

Neil Purling · 30th Oct 2016, 10:59 pm

Every so often this happens, when it is good and hot. I can't quench it by turning the volume to zero, I must switch off.
There are differences from standard. There is a 12V transformer for the heaters, a diode for the HT rectification (because I baulk at the price of a 12X4). The detector & o/p is a Mazda 30PL1. The unwanted squealing habit started well after the set was revived and modified.

30th Oct 2016, 10:59 pm	#1
Neil Purling Nonode Join Date: Jul 2005 Location: Hull, East Yorkshire, UK. Posts: 2,087	Champion 860 that intermittently squeals Every so often this happens, when it is good and hot. I can't quench it by turning the volume to zero, I must switch off. There are differences from standard. There is a 12V transformer for the heaters, a diode for the HT rectification (because I baulk at the price of a 12X4). The detector & o/p is a Mazda 30PL1. The unwanted squealing habit started well after the set was revived and modified.