Hi guys: I've rebuilt my AC-4 using the Heathkit Shop Kit recently and all went well. All the voltages read within range and I'm happy with the rebuild and the kit.
I have the AC-4 mounted inside the MS-4 cabinet and it sits atop my MN2000 with brand new rubber feet, yet I can hear a very low AC hum coming from the cabinet. It's not coming from the speaker because I can hear the same low level AC hum with the speaker cable disconnected. It's not enough to really bother me and I only hear it when the room is quiet and the audio from the rig is turned down. I'm just wondering if this is normal or do I have an issue that I need to take care of. Any ideas certainly most welcome. Thanks. Joe WW8X Miamisburg Ohio
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