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).
ACMP-73
ACMP-81
- 1081-Amp.pdf
- 1081-Bass.pdf
- 1081-Filter.pdf
- 1081-Low.pdf
- 1081-Out-power.pdf
- 1081-treble.pdf
- 1081-Upper.pdf
ACMP-84
Schematics
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.)
- A quiet ACMP-84: acmp84_good.wav
- A noisy ACMP-84: acmp84_bad.wav
Circuit Photos
| Overview: |  |
| Rear, L to R |    |
| Front, L to R |   |
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!
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
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.