I have a Allen & Heath Mix Wiz 16:2 dx. I have a few dodgy sliders on this desk so I wouldn't mind replacing the 16 input sliders. Now I have taken the back off the mixer and found that the sliders are alps. The question is, do I need the Logarithmic LINK or do I need the Linear LINK2 ? If anyone can help out that would be great cheers!

If I'm not very much mistaken, in PA applications like this you're looking for a log pot, rather than a lin pot. Having said that, I'd play it safe and just get the replacement part directly off A&H in cornwall. They're normally reasonably priced and have great customer service.

It is quite common for the mixing desk manufacturers to have custom faders made up by companies like Alps, in order to provide the required taper to provide the exact control needed, correct physical size etc.

Buying from the manufacturer as Matt suggests is probably the best bet. The only caveat to that is where there is a standard, identifiable part. For example, you can add an IC to provide balanced outputs (rather than impedance balanced outputs) on the auxiliaries of some A&H desks. The ICs are quite a bit cheaper when sourced from your favourite electronics supplier.

Simon

When you say dodgy, is it that when the channel fader is off you are still getting that channel breaking through?

If this is your problem it could be that there is a poor connection between the circuit board and the slider and not the actual slider itself.

Dave

The problem is that some of the faders are outputting full volume and I have no control over the actual level. Its only about 4 channels doing this but I might aswell change all the faders just incase the others are on the way out too. Its definately a fader problem as moving the fader from side to side usually stops this happening. I think switch cleaner has been used on the faders at some point and this hasn't helped!

Someone from the family lives down in cornwal about 10 mins away from the AH factory, so has popped down and picked some new faders up for me today, so thats a bonus!

Cheers for the help guys

Sounds very much to me like it could well be the connection between the faders and the circuit board if this is the case.

If your faders are occasionally outputting full volume - this implies that the earthy end of the fader is failing open circuit.
In early versions of the Mix Wizard crimp ferrules were used on the wires from the circuit board to the slide potentiometer (which were then soldered) - these are known to be a fault liability. Best to cut these ferrules off and solder the wires directly for reliability - at both ends. If you want to do a faster job - the crimp can be filled with solder.....