Hi
I have a question concerning the timing network in a variable mu compressor. I posted it in the "Another poor mans fairchild" thread, but got no response, maybe it is better suited here.
What is the difference, soundwise, from a network like in the fairchild, or the network rotheu posted, and a high impedance network like in prrs "very poor mans" sidechain. I am sure there is some distortion happening in a fairchild, but are there other reasons for different sounding compression?
I did read everything I found from prr, but he mostly covers the technical side of the problem (I learned alot from him!). But what about the sound, if technically the hi impedance sidechain is no problem.
I built the prr sidechain and can get 15dB (ca -10V on the grids in my design) compression on two parallel pcc189, and it can be really fast with a 0.2 mS attack. The only modification on my design is a 5532 buffer after the timing network to keep the grid resistance low enough for the 4 triodes. But maybe the buffer helps also with the ability to get fast gainreduction, I did not try without. But the 5532 is defintly able to drive 4 grids into -11V very fast.
The compressor sounds great.
The design consists of an input transformer into a stepped atty into two pcc189 in parallel (four tubes for stereo) into a lundhal 1660 configured as 2.25:1 output, no buffer. The comp can drive loads down to at least 1k without a problem.
If I do not need more than 15 dB of compression, is there still a reason for a power amp sidechain, solid state or tube?
Is there a difference in compression characteristics and/or sound?
The only comparison I have is the 670 emulation from IK multimedia and I get very similar compression curves with my sidechain, but I like my comp much better overall than the software (I should, shouldn't I?).
Thanks
Tobias
Tobias
I have a question concerning the timing network in a variable mu compressor. I posted it in the "Another poor mans fairchild" thread, but got no response, maybe it is better suited here.
What is the difference, soundwise, from a network like in the fairchild, or the network rotheu posted, and a high impedance network like in prrs "very poor mans" sidechain. I am sure there is some distortion happening in a fairchild, but are there other reasons for different sounding compression?
I did read everything I found from prr, but he mostly covers the technical side of the problem (I learned alot from him!). But what about the sound, if technically the hi impedance sidechain is no problem.
I built the prr sidechain and can get 15dB (ca -10V on the grids in my design) compression on two parallel pcc189, and it can be really fast with a 0.2 mS attack. The only modification on my design is a 5532 buffer after the timing network to keep the grid resistance low enough for the 4 triodes. But maybe the buffer helps also with the ability to get fast gainreduction, I did not try without. But the 5532 is defintly able to drive 4 grids into -11V very fast.
The compressor sounds great.
The design consists of an input transformer into a stepped atty into two pcc189 in parallel (four tubes for stereo) into a lundhal 1660 configured as 2.25:1 output, no buffer. The comp can drive loads down to at least 1k without a problem.
If I do not need more than 15 dB of compression, is there still a reason for a power amp sidechain, solid state or tube?
Is there a difference in compression characteristics and/or sound?
The only comparison I have is the 670 emulation from IK multimedia and I get very similar compression curves with my sidechain, but I like my comp much better overall than the software (I should, shouldn't I?).
Thanks
Tobias
Tobias