Hi, I modelled two circuits of tube and VCA compressor.
They seem to work well, but the only strange thing is the start point in the plots , there is in both compressors a wave ( oscillation ) for the first half of the analysis, and then they seem to adjust.
There are some errors in the circuits or in the .tran analysis?
In the tube comp, if I change the attack resistor from 81k to 500k ( the first one after the 2 tube diodes rectifer) the "oscillation" is a little bit less.
The VCA model is THAT 2181 , I found it in on the web and also I downloaded the that .lib.
View attachment 67151
They seem to work well, but the only strange thing is the start point in the plots , there is in both compressors a wave ( oscillation ) for the first half of the analysis, and then they seem to adjust.
There are some errors in the circuits or in the .tran analysis?
In the tube comp, if I change the attack resistor from 81k to 500k ( the first one after the 2 tube diodes rectifer) the "oscillation" is a little bit less.
The VCA model is THAT 2181 , I found it in on the web and also I downloaded the that .lib.
View attachment 67151
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