Thank you for the reassurance. That is the unit we have.Your unit is what I thought it was. Here it is on eBay:I do have the complete factory calibration instructions, just can't access them until next Saturday.Electro control 6424b Dimmer module | eBay
You are buying a used item that has been taken from a working environment. It has some scratches and dust from former use. No other accessories included . It comes as picturedwww.ebay.com
You could buy one of the eBay units for parts, especially the triac.
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@theatremgr LED friendly??? If your LED's are smokers, they'll probably love it.
Hi! My name is Paulene Spika. Many years ago in a previous life, I was a factory authorized EC service person. I am very familiar with the the dimmers in your system. There were a number of versions of this circuit, they all used a unijunction transistor and a pulse transformer for isolation. Other than the low end leakage, does the dimmer work? If so, all it may need is a low end adjustment. The pc board has two pots, one is high and one is low. A true RMS meter is nice, but not essential to setting the low end for zero output. I don't remember which pot is which because it's been decades, but the low end pot will have an immediate effect on the output when you turn it. You can't hurt anything by turning the wrong one. If you don't have a meter, an incandescent lamp in a pigtail socket across the dimmer output is a good indicator. If I remember correctly, these firing cards were identified as a PC171. They didn't have the greatest curve, but they were fairly reliable. Those giant 1/2 inch stud RCA triacs can be replaced with a modern isolated stud triac that has a 40amp and400v or better piv rating. But you will have to get creative with mounting. Do not attempt this work if you are not comfortable or experienced with 120 volt electrical equipment. I put that in for the lawyers. I wish you good luck in your work.
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