Report "Hi there , NAD C370 amp have had various probs most of which I have repaired ,fiter caps (purple) bad ....replaced voltage regs and adjust resistors near tone board repaced because neg voltage shoud have been about -34vdc but was around -15vdc . when the link to the tone board is removed ,-v is fine ... Symptoms are... Idle current (should be read -50mv or 100mv ac) is not stable . sound heard when volume at zero (more than before) and finaly , sounds quite ugly with loss of bass.. been about a month without my Hi Fi ...HELP me please"