Hi all! I just joined Beoworld and have a question about my Beomaster 1900. It is a Model 2904. I recently purchased it, along with a nice pair of Beovox M70's for $175 U.S. I thought I had done ok until I heard this hum on the left channel. There is still music comming through the left channel along with the hum. Any ideas of the cause? A cap going