Amp for new Meadowlark Krestel 2's ?

I could think of a few reasons. I'm not sure of if you have anything beyond the Marantz connected to the JoLida, but I had one in my audio/video system that also made an annoying hum.

I found that when I had my television output connected to the amplifier, the hum was caused by the cable connection to the television. Someone suggested this piece from Parts Express to eliminate it. I never bothered with it, and just unplug the cable connection when watching dvds or listening to music since I never really care to listen to television programming through the system anyway.

Or, you may have another ground loop issue. Look into whether your cables are shielded and the path they follow in your rack. You may have to rearrange them to isolate the interconnects from power cords.

If the hum is in one channel, you could try swapping each of the input, driver, and power tubes to try to isolate a bad tube.

Finally, it may be a construction issue such as a bad solder joint. If you feel comfortable opening the amplifier, you can inspect the joints inside, but I would leave it up to the dealer or technician.

Good luck!

Thanks, I played with the cables last night to no avail. I have my sub hooked up to the pre outs and it sends hum to the sub also. It was suggested to carefully wiggle each tube that perhaps one of those is the culprit. My first experience with tubes so I'm a bit lost. My email to Jolida hasn't been answered.

Beernut, I had a similar "problem." Turns out it is not the amp but crappy DC in my AC line. I ordered a PS Audio Humbuster unit from Music Direct and this quieted down my Jolida 302B to near silence. What a great unit!

Beernut, was previou amp hooked up in similar fashion as new Jolida? If so, was there any noticeable hum? It seems as though the amp's power supply filter should eliminate hum.

Good info guys. Jolida recommended re-biasing the tubes, didn't help. Seems to be tied into my electric circuits in my apt, my ceiling lights are controlled with a dimmer switch. Turn it down or off and the humm gets quieter but not gone. This did not occur with my solid state amps. Suggestions appreciated. Have to go to plan B, the humm is too noticeable to just ignore.