2. misc-audio
  3. 1141605720

Mcintosh transformer hum

I recently acquired a Mcintosh MC 7104. It is in mint condition, and works perfect except for one annoying issue. There is a physical/mechanical hum eminating directly from the transformer. It is not loud, but is audible from a few feet away when the room is completely quiet. It is sometimes noticeable on quiet passages from my chair. About as loud as a purring cat. I haven't had this problem with any other audio equipment, but feel it might be a power issue. Could this amp be more sensitve to power conditions or could it be defective? It does sound great except for this. Any suggestions?

B&K 4090 pre
Sony S9000ES DVD/CD/SACD
Mc 7104 (bridged to 2 ch) replaced B&K 120x2
Yamaha MX830 (for sub)
B&W 705
Peerless subwoofer 12DVC (DIY)
Dahlquist active crossover
audioquest and vampire interconnects
robbirdsmedia

Showing 1 response by hgeifman

hgeifman
2,351 posts
 
As stated above, you should contact McIntosh Labs with your question on the physical or mechanical hum coming from the transformer on your MC7104. If your unit does not turn on or if your situation is an emergency, do not e-mail or fax McIntosh. Phone the factory, ask for Tech Support and leave a voice message for Chuck. He will return your call promptly.
Chuck Hinton: chinton@mcintoshlabs.com
Hours: 9:00 am - 5:00 pm EST, M - F
Toll Free: (800) 538-6576
Phone: (607) 723-3512
Fax: (607) 724-0549
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