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RD-100 Corrosion on 4016 B


Stephen S
Posted on Monday, January 17, 2005 - 10:18 am:   

Since I haven't been able to get a difinitive answer on my distortion issue I decided to take the amp apart. Once inside I re-seated the IC chips. When I pulled the 4016B off I noticed that there was quite a bit of corrosion on the 7 and 14 pins. There is also some corrosion on a resistor located just above it. As well as what looks to have been some sort of liquid around this area. Sort of resembles battery acid?? Any ideas?
michael kaus
Posted on Tuesday, January 18, 2005 - 04:52 am:   

THey are trash. At that point in the preamp stage, ANY corrosion could cause wierd problems as the signal is so smal. THe problem would be finding them. Google the number and see if you come up with a replacement. Mike.
Stephen S
Posted on Tuesday, January 18, 2005 - 06:14 am:   

Thanks for the reply. I actually took a toothbrush and brushed away the corrosion. Once I re-seated the IC chip, put everything back together, and fired it up the distortion cleaned up and actually sounded pretty good. Does that sound right to you?
I also found the chip for $.61 out on the internet. I will most likely buy a couple just in case.
michael kaus
Posted on Tuesday, January 18, 2005 - 01:15 pm:   

That should do it for a while but once corrosion starts, it will continue unless you do something to stop it. I would get a couple of extra chips just in case. The LM307's are in short supply apparently. Those are in the older MM's with the silver badges. The 4016 is a lot newer.