Threshold 400A Amplifier and Conrad Jonson MF2500A

Hi Osirir

IME don't plug the Threshold 400A into any kind of power conditioner. I remember I plugged it into a 1.8Kva Isolation transformer & when I turned the 400A on the isolation transformers started humming even louder. After that it went straight into the wall.

Now I didn't leave it on all the time. Electricity by me is expensive. What I had to do to get the amp sounding right was leaving the amp on for 10-12 hours before a listening session. I would turn it on in the morning before work and when I got home after doing some chores in the evening I would start my listening session then. The music sounded real sweet.

Thanks for your wonderful advice. It makes me feel good to be a member when you get honest and useful  response from beautiful people. Thanks Again. Chears  

osirir just curious why does the title of your post mention the Conrad-johnson MF2500A?

Yes indeed. The CJ 2500a is a fine amplifier!

I'd be a little paranoid leaving the 400A on all of the time.  I had one and loved it.  The energy waste is huge so I only left it on if I was going to listen again in the near future. 
Why paranoid?  This is a fairly old unit and it well known that when they fail it can be catastrophic.  If they fry, it won't just be one transformer but most likely a whole bank of 8...
Use a surge protector if you aren't using a conditioner.  Also, have a tech check it out before leaving it on all the time.