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ajgriff · 27th Feb 2020, 6:15 pm

Towers gives AC188/K Hfe as 100 min so not sure that T013 is far enough out to be causing such a significant effect. Are the voltages shown on the schematic for the audio stage correct with the bias set to the specified figures? Also sounds like there's an issue with the mains power supply. You don't say whether or not AM is working ok at the DIN output?

Alan

27th Feb 2020, 6:15 pm	#7
ajgriff Nonode Join Date: May 2004 Location: Halifax, West Yorkshire, UK. Posts: 2,587	Re: Grundig Concert Boy 1100 (again) Towers gives AC188/K Hfe as 100 min so not sure that T013 is far enough out to be causing such a significant effect. Are the voltages shown on the schematic for the audio stage correct with the bias set to the specified figures? Also sounds like there's an issue with the mains power supply. You don't say whether or not AM is working ok at the DIN output? Alan