blue_luke
Well-known member
Hello all! 
I have one of those compressor/limiter Symetrix '501' peak-rms compressor/limiter.
I always liked it, easy to set, sounds good etc...
The first thing I would need is that I have lost the schematic so if anyone have it, can you post it here?
The second problem I have with it is that is a rather old unit, from the 80's (serial number #125!!!)
This thing uses a Allison Reasearch EGC-101 vca, and had a black box that did most of the rms/peak signal to dc conversion.
This black box is long dead unavailable anymore. So the obvious question is: does someone have for sale or trade??
But being somewhat of the pessimistic type, I do not expect much response to this last question, and a couple of years ago, I tried to replace that black box with a vero board version using a http://www.ka-electronics.com/images/SSM/SSM2110.pdf
It works 'somehow' but now every adjustment is very twitchy to say the least... to a point where it is unusable.
Are there some guys here who can point me in the right direction in trying to fix it?
I am not too insistent on using the 2110, a THAT chip would be fine also I guess, what I am missing are the parameters of the signals used in the black box (input level, output current, etc)
Thanks, Luc
I have one of those compressor/limiter Symetrix '501' peak-rms compressor/limiter.
I always liked it, easy to set, sounds good etc...
The first thing I would need is that I have lost the schematic so if anyone have it, can you post it here?
The second problem I have with it is that is a rather old unit, from the 80's (serial number #125!!!)
This thing uses a Allison Reasearch EGC-101 vca, and had a black box that did most of the rms/peak signal to dc conversion.
This black box is long dead unavailable anymore. So the obvious question is: does someone have for sale or trade??
But being somewhat of the pessimistic type, I do not expect much response to this last question, and a couple of years ago, I tried to replace that black box with a vero board version using a http://www.ka-electronics.com/images/SSM/SSM2110.pdf
It works 'somehow' but now every adjustment is very twitchy to say the least... to a point where it is unusable.
Are there some guys here who can point me in the right direction in trying to fix it?
I am not too insistent on using the 2110, a THAT chip would be fine also I guess, what I am missing are the parameters of the signals used in the black box (input level, output current, etc)
Thanks, Luc
