Blue Jinn
Rider of the ARPocalypse
Hi all,
Been a while. Quick question if anyone has done the upgrade the VCAs to the Alesis? The mod calls for replacing hte VCAs with THAT2180s. However, AFAIK, the 3630 has trimmable VCAs. The 2180s are pre-trimmed. (Which would also necessitate removing a pot and a resistor) THAT 2181 would be the replacement, but this requires setting the trim properly with a signal generator and a 'scope. There is another thread out there, which calls for leaving the trimmer in place and swagging it by leaving hte pot mid way. (FYI you're not supposed to do that with 2180s per the datasheet.)
I have a dbx 266 which is pretty much the same compressor circuit. I had planned on doing the easy mod and replace the (whatever the dbx part is) with 2180s and removing the trimmer. The distortion specs on the 2180 are not as good as 2181 (the trimmable kind)
Has anyone done the Alesis mod? Which VCA?
Any recommendations. I have the 2180s already. The 2181s are the same price.
The other problem is figuring out where to cut the trace on the 266 to switch in/out the gate. It's not as obvious as the jumper on the 3630.
Been a while. Quick question if anyone has done the upgrade the VCAs to the Alesis? The mod calls for replacing hte VCAs with THAT2180s. However, AFAIK, the 3630 has trimmable VCAs. The 2180s are pre-trimmed. (Which would also necessitate removing a pot and a resistor) THAT 2181 would be the replacement, but this requires setting the trim properly with a signal generator and a 'scope. There is another thread out there, which calls for leaving the trimmer in place and swagging it by leaving hte pot mid way. (FYI you're not supposed to do that with 2180s per the datasheet.)
I have a dbx 266 which is pretty much the same compressor circuit. I had planned on doing the easy mod and replace the (whatever the dbx part is) with 2180s and removing the trimmer. The distortion specs on the 2180 are not as good as 2181 (the trimmable kind)
Has anyone done the Alesis mod? Which VCA?
Any recommendations. I have the 2180s already. The 2181s are the same price.
The other problem is figuring out where to cut the trace on the 266 to switch in/out the gate. It's not as obvious as the jumper on the 3630.