Hi Christian, 

Pop the top off and look for the board date/revision silkscreen markings
on the main board. IIRC, this is written close to the power entry
connector. 

If your MP-1 has a top-switch, it's one of the old ones, like mine, from
circa 1987. 

Other clues in old gear, in general, are date markings on integrated
circuits like op-amps, which can help estimate the age. E.g. my MP-1 has
a NE5532 chip marked with two lines: "NE5532N" and "8605D". The second
line is a date code: week 5 of 1986. 

Does your MP-1 have a start-up problem? The old ones have a design flaw
which causes them not to start up sometimes when powered up. I debugged
it myself to uncover the root cause, and then later discovered they
fixed it in a 1989 revision in exactly the same way. 

I'm guessing that you might have seen this fix [1] and are wondering
whether you have an older one. 

On 07.05.2014 11:45, Christian Tremblay wrote: 

> How do I do to find the year of mu ADA MP-1? 
> 
> Thank you.
 

Links:
------
[1]
http://www.kylheku.com/mp1-files/mp1-repairs/ADA-MP1-kaz-startup-fix.jpg