Anyone own a Sigma AV5000?

[kazuo]

I own two of them, and the adjustment pots (CBC & Bright) are terrible. If you bump the control box or the table it is on even slightly, everything comes out of adjustment. It really, really sucks.

Is this common, or did I just end up with two bunk units? Anyone know of a fix?

 

[XianXi]

Nah, the pots are crap with a low rating plus over time the carbon wears out and so does the wiper. You can just replace them.

 

[kazuo]

Thanks for the info, XianXi. I'll try to desolder them tomorrow or Monday and see if I can figure out some direct replacements.

Do you have any recommendations for a superior pot to use for this application?

 

[cruzlink2]

What is a good replacement for these type of caps then?

 

[XianXi]

Thanks for the info, XianXi. I'll try to desolder them tomorrow or Monday and see if I can figure out some direct replacements.

Do you have any recommendations for a superior pot to use for this application?

Best would be a higher wattage linear one but it would be easier to fit a direct replacement. Hopefully there isn't something loose in your supergun.

 

[ImportantBet]

Apologies for the necro, but did you happen to get direct replacements?. I would like to replace mine if possible.

FWIW, I measured ~20k ohm but having trouble finding a rotary pot with 9 pins like in the pic below

 

[XianXi]

Apologies for the necro, but did you happen to get direct replacements?. I would like to replace mine if possible.

FWIW, I measured ~20k ohm but having trouble finding a rotary pot with 9 pins like in the pic below

Looks like a 3 Gang Pot, PC pin, side adjustment. Might be hard to find, if you do find one see if you can get a 1/2 watt one, most are 1/20th watt.

 

[kazuo]

I was never able to find a replacement unfortunately. I removed the pots and soaked them in Deoxit overnight, cranked them back and forth a bunch and they work good enough now.

If you do find a replacement, please share, I'd love to get a couple as well.