Go inside your preamp and swap the tubes. If the problem moves to the other channel after the switch, you have a bad tube.
Radio Hum
I just hooked up a pair of conrad-johnson Premier 8A monoblocks to a c-j PV-11 preamp, and I have a wicked hum, even a zero volume, in only the right channel, and it is picking up a radio station. I have changed and moved speaker wires and interconnects to no avail, though it does get better and worse with movement. It will not happen in the other channel. What am I missing? What else should I check? Is something wrong with my preamp, cables, power supply???
Thanks, Brian.
Thanks, Brian.
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All the tubes have now been replaced, a solder ground repaired, and a blown cap replaced. On a reference system, the preamp is now silent. I bought a new, shielded power cord. My amps were just cleaned and serviced by c-j. The major right side hum is gone. But there is still hum, which is much softer, and is now volume-dependent. And I still hear the radio. Even when I unplug my tuner entirely and there are no other radios around. Any other ideas? |
Hi Brian. The radio signal you receive has zip to do with your tuner. Something in your system is acting as an antenna. Wondering if there are unused inputs on your preamp? If so I'd try using shorting plugs on those inputs. Just might be a cure. Here's a picture of a shorting plug and also a place to purchase them. Shorting plugs |
- 5 posts total