What I mean is that the input coupling capacitor may not be the value it's marked with.? In 40 years of repairing electronic equipment I've run into many cases of mismarked, or maybe just floor sweepings parts.? We had a package of .1 uf bypass caps that all measured about 15pf and a bunch of 2N3055 transistors that were PNP not NPN and the best ones were 1% resistors that measured not closer than about 20%.? My "guess" is just that like all the other guesses you have received.? I've found it pays to not overthink the problem until you have checked the simple things first.? I've been guilty of not checking the power supply first, many times, when I was in a hurry.? 73? Dave
