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-   -   A12P break in question - (http://www.diyaudio.com/forums/markaudio/216571-a12p-break-question.html)

mp9 21st July 2012 04:42 PM

A12P break in question -
 
I'm at the 45 hour break in point going on/off at 4hours intervals /1.5 - 2hour cool down breaks in-between when 80f in room temp, and extending that to 6hours on when 75F.

Been using a Scott222 tube amp/cdp source up till the 41hour off interval at which point i swapped out the tube amp for a cheep Technics solid state recover/cdp source. I was reluctant to do so but decided not to waste the tubes.

Problem is, upon hitting the recovers power button, while i didn't hear any noise from the A12P's till the cdp began, i did see the cones slowly move up and down once:[

I was reluctant to use the receiver because i was afraid that would happen and it did.

So my questions are as follow's:

Did it F' up the drivers?

Should i put the Scott222 tube amp back in place of the SS receiver after the next off period?

Would it be ok to leave the receiver's power on and just turn off the cdp and the volume down to it's lowest point and turn off the cdp source for the hour and a half rest cool down period so as to avoid the start up cone excursion?

vaughn 22nd July 2012 12:56 AM

It sounds like you might have some DC offset present at your output terminals. This is pretty common in older solid state units that haven't been serviced.

Here is a thread on how to measure this;

Amplifier Distortion, DC-Offset, and You! - AudioKarma.org Home Audio Stereo Discussion Forums

I would take the Technics off of the 12ps immediately to avoid damaging them.

mp9 22nd July 2012 05:36 AM

Thank you, i did remove the Technics recover. Turned on the Scott222 and none of that cone excursion issue. I had a bad felling about using that Solid State receiver, should've went with with, i hope it didn't do any damage i'm not aware of.

vaughn 22nd July 2012 04:54 PM

You should be fine if the drivers are still producing sound. A very high DC offset can destroy voice coils, but if your 12P's are still playing you should be fine.

I need to pick up a little amp to break mine in, they are still sitting in their boxes:eek:

mp9 23rd July 2012 06:14 AM

That's a relief, they are still playing, lesson learned. Thanks again for the help and reassurance.

nicoch58 23rd July 2012 08:19 AM

HI , put 1000uf in series to the alpair ;)


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