This is the AUX Master board from a Soundcraft later version Live mixer, earlier versions had the thicker buttons and and square push buttons, this one has the oval push buttons on
I have sometimes two variants
SC3533B Iss 3 and Issue 4 normally if they dont change the front pcb number thay can it seems be interchanged
This Channel specifically came from a Soundcraft live 4-2 mixer.
All of these Soundcraft mixers were very good value and now many are being repaired for the "British EQ" sound, its also about getting hands on knob twiddling fun that you just do not get on the digital side of things.
The electronics here is pretty straight forward, using standard pots and TLO72 amps, if you have one of these its worth having an extra channel that you can just drop and swap if needed.
There is only one of these boards in the unit, it has a habit of going wrong
This has to be packed well and goes by courier because of its size
Can send outside of the UK contact me for an exact qoute