TnC Audio Preamps

Below you’ll find schematics for the TnC Audio ACMP-73, ACMP-81 and ACMP-84, plus interior photos of the ACMP-84 and sound samples of two ACMP-84s (one relatively quiet, the other not so much).





Noise samples

Compare two ACMP-84s, with gain maxed and an SM-57 plugged into the input and the EQ engaged. Some of what you hear is the sound of the room, but both of these are noisier than my BLA-modded Digi 002-Rack pre’s. (However, the ACMP-84s have nearly 6dB more gain than the BLA 002 too.)

Circuit Photos

Overview: IMG_8728
Rear, L to R IMG_8731IMG_8729IMG_8730
Front, L to R IMG_8732IMG_8733

3 Responses to “TnC Audio Preamps”

  1. Tom Altman

    May 24th, 2009 at 6:16 pm

    I got lucky and got a quiet one! Sounds great. The only problem is it doesn’t fit in my rack! The chassis is too wide!

  2. Jud Haskins

    January 30th, 2010 at 1:55 pm

    I just picked up a used 81 and this thing smokes. On acoustic guitar it gives me THE sound I can’t get from my other budget pre’s even the modded ones. There is no question this is the chance (no pun intended) to get into serious pre-land for cheap. It all is coming down though..the golden age pre is supposed to be great, but for less you get eq too! Cant recommend it enough. J

  3. Deshawn White

    July 16th, 2023 at 12:42 pm

    Hey! Did anyone ever figure out what was causing the pop on the 84? I’ve looked everywhere and I can’t find anything.

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