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-   -   MC275 Hum Conundrum (http://www.diyaudio.com/forums/tubes-valves/37226-mc275-hum-conundrum.html)

rkic 4th July 2004 11:41 PM

MC275 Hum Conundrum
 
I replaced most of the caps in my MC275. Power up test revealed a loud hum. Making sure of my wiring I chanced to approach capacitors C1 and C12 with a pair of needle nose pliers - the hum got substantially louder perhaps 6 - 9 db or so. An aluminum framed magnifying glass also increased the hum. A plastic pen did not.

What do you think?

Thanks in advance and Happy Fourth.


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