Philips India radio 15RB697 (Algemeen)

door MarcelvdG , 03.12.2020, 13:12 (1451 dagen geleden) @ Pandu Rajan

Are R3 and R4 and the supply voltage OK?

If Piet's hypothesis that the oscillator loop gain increases when you change the C17 connection is correct, then there must be something wrong that reduces loop gain to well below the design target. That could be a valve with reduced emission (but you checked that), dirty switch contacts (you also checked that), a drifted resistor or an insufficient supply voltage - and possibly other things I haven't thought about.