Seventh Circle Audio

by **deadpoet** » Mon Jan 02, 2017 2:12 am

Hi y'all,

I just did a modification to my A12's which might be of interest to the rest of you guys: add an output fader.

I have my A12's for about 7-8 years now and love them but not having an output fader like the N72's always was a drawback to me. For a while I searched for a solution but no one seemed to have one - until a few weeks ago I stumbled upon the variable T-pads that CAPI and Hairball sell. A little measuring and thinking later I came up with the following solution which requires no drilling in the chassis.

Needed: 1x variable T-pad (I got the CAPI one - http://capi-gear.com/catalog/index.php?cPath=48 ), 1x 10k resistor and some wire per channel.

- dremel off the back T-pad legs and the part of the PCB that's sticking out its' back

- remove the trim pot from the PCB
- wire in the resistor across the two outer holes and short the middle and "rightmost" (furthest away from the phase switch). Make sure it is flat to the PCB

- unsolder the orange and blue wires from the output trafo (these are the pos and neg outputs of the trafo)
- wire these to the T-pad's IN pos and neg and use two pieces of wire to solder the OUT pos and neg back to the PCB

- assemble the rack again and mount the T-pad upside down.

Works perfectly for me - or did I make some kind of impedance mistake? Anyhow, when testing it sounds like it works ::)

Seventh Circle Audio

A12 - Add output fader

A12 - Add output fader

Who is online