bristol188
New Member
Help please. My own amp. a Marantz mod. 1070 (bought new, sentimental value) has developed a quite loud mains hum. It is independent of volume control and
channel slider, just constant. Amplification is perfect, everything works perfectly. I have a schematics and have some knowledge of
electronics. Played with 240 - 415v and dangerous machines all my life, no fingers missing and no electric shocks! Oh just a few- shocks that is. (70 years young) I have checked out the two mains smoothing caps. (10000uf) and they seem
ok (nice fat spark when disconnected and shorted) Is that a good test? I would like some advice as to what else to check . Thanks Rog.
channel slider, just constant. Amplification is perfect, everything works perfectly. I have a schematics and have some knowledge of
electronics. Played with 240 - 415v and dangerous machines all my life, no fingers missing and no electric shocks! Oh just a few- shocks that is. (70 years young) I have checked out the two mains smoothing caps. (10000uf) and they seem
ok (nice fat spark when disconnected and shorted) Is that a good test? I would like some advice as to what else to check . Thanks Rog.