Quote Originally Posted by cchean
Hello everyone: I have a vintage Mission Cyrus 2 integrated amplifier that is working fine but when switched to the phono input and the volume control turned up, the hum is terribly loud. When playing a record, most of the hum is masked by the music but I could not believe how loud it was when I heard the amp without a record being played. The hum is even louder when the phono inpuit is set to MC. Since I use it with a Rega Planar 3, the Rega doesn't have the ground lead. Is it possible that it is the lack of the ground lead that is causing the problem? I use my audio setup with a Chang Lightspeed line conditioner although my house mains is not earthed. Could it be that the amp is faulty? How common is this problem? Any advice will be appreciated. Thanks.
Rega's are known for this problem, they have unsheilded motors which interact with the cartridge to cause hum. Check by unplugging your TT from the wall outlet, with the amp off, turn the amp on. Is the hum gone? If it is than the TT motor is the problem. If the hum is still there than unplug the TT leads to the amp, with the amp off, turn the amp on. Is the hum gone? If so than it is still your TT, if not, if the hum is still there, the problem is in your amp.

I don't know how to cure the Rega hum problem, you might try floating any grounded plugs with a 3 to 2 cheater plug. Check with Rega for any possible fix.

Good Luck!