As noted above, it is an absolute "must" that you use shielded cables. Also, if you have your cartridge "unloaded" (e.g., 47kohms or higher) you might try a lower figure (higher loading), such as 1,000 ohm or 150 ohm, etc. Higher loading attenuates high frequencies that may be overloading the phono stage or otherwise causing it to act up.
A friend had this problem with a Transfiguration Temper V cartridge, but not his Lyra Titan, and the difference was the lower source impedance of the Transfiguration cartridge. The Hovland preamp he was using has a factory default setting of 100kohms. Choosing a lower setting (higher loading) cured the problem.
A friend had this problem with a Transfiguration Temper V cartridge, but not his Lyra Titan, and the difference was the lower source impedance of the Transfiguration cartridge. The Hovland preamp he was using has a factory default setting of 100kohms. Choosing a lower setting (higher loading) cured the problem.