Grado's are unshielded cartridges and hum is common. I also use a Grado. My amp has separate gain controls on the back which I adjust down. The hum is still there but only from very close to the speaker not from the listening position. I've also read about some people gently moving the wires behind the cart a bit to reduce hum. Another aspect might be in the interconnects you are using, if they are unshielded, it could cause some hum. Go to the archives here and at Audio Asylum and search "Grado hum" for more info.
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