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Ed_Dinning · 27th Jun 2017, 8:30 am

Hi Andy, usually more or less as per the schematic. A low value NON INDUCTIVE resistor (say about 0.5R or less of resistance wire, not coiled ) and take the feedback across that. This is in the ground return of the opt sec. Capacitor should be adjusted for best results when driving the speaker(s) of choice with a 1KHZ sq wave.

Used not too successfully in the PCL83 version of the Pye BB

Ed

27th Jun 2017, 8:30 am	#210
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: 807 (maybe) amplifier build. Now EL34 Hi Andy, usually more or less as per the schematic. A low value NON INDUCTIVE resistor (say about 0.5R or less of resistance wire, not coiled ) and take the feedback across that. This is in the ground return of the opt sec. Capacitor should be adjusted for best results when driving the speaker(s) of choice with a 1KHZ sq wave. Used not too successfully in the PCL83 version of the Pye BB Ed