Modding Old School Audio MP1 to API 312

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aquariusblue

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May 21, 2021
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Westfield Massachusetts
I have 2 OSA MP1 500 series preamps that I was considering swapping opamps to api and maybe transformers as well . First would that be possible with out headaches, and is it worth doing? I like the output gain attenuation on the MP1. No direct input but that’s ok. Original API stuff is getting more rare and expensive...thoughts ?
 

emrr

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Apr 12, 2006
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There is a lot of variation in 'what' an MP1 might be, useful to know what transformers and op amp you have.
 

aquariusblue

New member
Joined
May 21, 2021
Messages
3
Location
Westfield Massachusetts
Hey Doug!
Thanx for your reply. I have 2 identical channels as in the pictures. I know there are A B and C versions. these I believe are the original versions. I liked them at first and felt they compared favorably to my original api. Over time using them next to my Melcor AML-27 I have cooled a little... but love having the output attenuation that the MP-1 has. That is where my thought came about modding (I would have someone do it as I am not gifted in that way). I have even considered tracking down some Jensen JTK-110 input transformers ..if again possible and worth it.
 

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