Musical Fidelity A3cr Power Amp ?Break-in Period?

What is the best way to break it in? Do the speakers need to be connected to break it in? I can run my tuner to the thing all day if I need to, but if the speakers have to be connected, I will have to keep the volume down.

Platsolos,
Being as you're not trying to break-in the speakers, you don't need to have it loud. I'd keep the speakers connected and maintain a signal flow from any source i.e. CD, tuner, etc. Your objective is to just keep the amp warm and juice running through it. Personally, I'd use the repeat on CD with the Cardas burn-in disc. This disc has various noise tracks to assist burn-in and full frequency spectrum tracks that supposedly de-mag the system. I beleive it works and was recommended in the TAS mag. a few back. There's some cross polarity thing you can do with the speaker wires, but I'm not sure exactly how that works. I think that's a trick to assist speaker break-in as it draws more juice, but lessens the volume? Good luck.

I've had the A3cr since last Oct. I think it started to break in at 40 hours and toook about 100.
I still think when it has been off for 3-4 days it needs a couple of hours to loosen up. This is the feeling I've had with it in the past few weeks. I wonder if long term ownership will prove this weakness I percieve to be a reality.
Grainy? No way. Not in my opinion. Maybe your CDP or DAC or dirty wire connections. M-F is smoooooooth. Maybe too smooth.

I may offend some here with this post, but am only relating what i heard with the A3cr amp and pre combo. After one month of extended use--- NO BASS- no grain, extremely transparent and quick. The MF pre lacked quite a bit of information compared to two other pre amps i tried with the MF amp (Electrocompaniet 4.7 and Rogue 99) Soundstage widened considerably adding either to the MF amp. This may be a nice combo with Maggies, for me, out the door they went FAST.

Stuff used to evaluate the MF

Eggleston Fontaines
Cal-CL-10
Custom tube Dac.
JPS Super FX ICs & Super 2s Magnan Vi Nirvana SL
AP Oval 9s
ALL JPS power cords and the mighty Power AC did little to help the Enemic MF amp.

Thanks for your replys......I know the A3cr is supposed to be very smooth, that is why the grain is really worrying me. Could it be that the amp is so transparent that it is revealing the faults with my digital?? I dont have the 18B yet, but am hoping when it arrives it will really help things out.

Another note, about a year ago, we had a power surge and my cd player kicked on and played an entire CD at full output. At that time I had my Marantz hard wired directly to the amp and used the variable out as my volume control. With this darn cd player, whenever it is started up, the volume goes to max, and the thing starts to play automatically.....thus, when the system was left on while I was out..we had a surge and presto! (my only savior is that I dont think the max on the player equals the max on a preamp--so it may not have been that bad)

After this, I had done extensive testing on the speakers and never noticed any change..no blown speakers, changes in sound quality etc. So to make a long story short, I dont think the grain is from blown tweeters, as I can even hear the grain at low volumes with my new setup.

I am hoping it is a combo of 1) A3cr resolves so much that it is revealing my 2) crappy digital source (that hopefully will be remedied with the new DAC when it comes in) and 3) the amp needs more break in.

Any thoughts?? Thanks for all the help!