What is the intermittent shield. Is IEC internal electrical connection? and how can I remedy this? Cables seem fine as well as connections. Even swapped another power amp to see if this was the problem and this too was humming loudly. I also switched out tubes on the pre with no change.Opened the pre and saw no visible signs of any problem. The headphone amp works so Im thinking the problem is with the tube pre amp.The only thing I see is when I jiggle interconnects from preout to amp in I get humming coming in and out.
Ho Hum
I am running tube preamp,tube phono stage,tube headphone amp into the amp section of HK 730 integrated.I have been running it this way for 6 months no problems. All of a sudden there is a wicked hum when they are powered up. After some tests its seems as if the headphone amp does not experience the hum at all when listening to the phones. When it hums the preamp is very sensitive to the touch and makes severe thumping through the speakers. Then the problem just disappears for a listening session mysteriously. The next morning it is happening again. Any thoughts? Tubes? Ground Loop? ????
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- 7 posts total
- 7 posts total