My Mac 162 power amp had audible transformer noise and very audible hum coming from the speakers. It was hard to take after living with Japanese high end amps which are tomb quiet. I sold it rather than going through the repair hassles.
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
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