Hafler TA1600 buzz (only occurs when central air is on)

[warble2]

Hey all,
I love my Hafler amp, but this is the one piece of gear that gives me grief in my home studio when the central air unit is on. Contstant buzzing - sometimes pulsating, but mostly steady higher-pitched buzzing sound. The buzzing occurs with nothing plugged in, and is heard through my Tannoy Reveal monitors. Gain knobs full open or full off - the buzz is still there.

I've tried my ART SP4x4 power box, a PowerWerks Power Pro box, plugging directly into 4 different outlets all around the house, and the buzz still occurs. When our central air is off, all is well. When it fires up, after about 2 hours, the Hafler starts a-buzzin'. I'm getting about 110 V voltage readings (which occurs when the air is on), so I'm thinking dirty or not enough power to the amp, but I have no idea what's up.

I've tried my Ebtech hum eliminator as well to no avail.

Any ideas? Would a power regulator help? Not sure what to do at this point.

[dementedchord]

feeling adventurous???? go to the panel and turn off the line with the AC on it... now go to the AC unit and solder in a .1 micro farad 600 volt cap across the power to the AC unit... good possibility the noise is gone... all disclaimers are in force...

[warble2]

Interesting....

Found the part online for only a couple bucks, but do I fee adventurous?

I guess if I knew exactly where to solder it in, I'd give it a shot. I do know how to solder, just haven't done anything with power inputs/outputs before.