2. amps-preamps
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Mcintosh 250 Transformer Hum Normal

Hi,
I had not noticed till today as it was very quiet here, I notice a slight hun from the unit, Nothing from the speakers.

Again I do not recall it but I had never had it on in a very quiet room and you have to be very very close (like right next to it) it could be that i just have very good hearing in that frequency range ;-)

If this is not normal what could cause it? The unit does not run warm and sounds great.
escorial
erik_squires
16,186 posts
 
It very well could be.

Worth checking if it's responding to DC on the line. Turn off everything else in the home, via breakers, and see if it goes away. :)

Even if it is DC, it's not harmful, and the only negative effects are your level of annoyance.

Best,
E
blueskywalker
91 posts
 
Hi Escorial, you could ask a shop to borrow a dc blocker for power amps and see if it helps... This could reduce or eliminate the hum and even improve sound quality, should dc on the ac line be indeed the problem
escorial OP
17 posts
 
Problem is not the wiring, have a Macintosh 6100 here also,  that is dead quiet even if you put your ear right to the cabinet.

Its the 250 transformer Im sure and annoying as heck.

I have it in my bedroom and like listening at low levels through the night. I can hear this at over 12' away.

The dealer gave it a 30 day warranty,  sadly to say its going back. Its a  beautiful example but ...



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