Svart
Well-known member
In a post that I can't seem to find for the life of me now, there was the normal discussion about recapping and reamping boards but one point stood out in my mind.
Sorry whomever you are, I can't seem to remember who brought up an idea that I was interested in before that thread started. the idea was getting rid of interstage coupling caps. I had tried to just remove them and see/measure what would happen. nothing shocking happened, just a lot of DC offset and clicking/crackling when stages were switched in/out. the DC offset was even noticable on the wave editor program i use to master. viewing a channel with the coupling caps installed showed nothing out of the ordinary, viewing one without the caps showed terrible offset.
mind you, this was with NE5532s in most of the signal path, and around 10 coupling caps.
ok enough background. In this thread a forum member mentioned that FET input opamps do very well with DC offset and other assorted things that BJT input opamps would have trouble with. I thought about it and since my testing sans caps was done with BJT opamps and I had since replaced several channels with high-end(yes that's subjective but i DO like the sound better..) FET input opamps I decided to do another round of testing.
absolutely NO DC offset detected without caps. the only caps in the channels are the phantom blocking caps and a few in the outboard gear.
I know this isn't as technical as most would like to see but removing 10+ caps per channel does add up to a considerable amount.. however the costs in moving a console over to FET input amps is also very high.
I invite conversation over this topic because it's one that i have rarely seen here.
:thumb:
Sorry whomever you are, I can't seem to remember who brought up an idea that I was interested in before that thread started. the idea was getting rid of interstage coupling caps. I had tried to just remove them and see/measure what would happen. nothing shocking happened, just a lot of DC offset and clicking/crackling when stages were switched in/out. the DC offset was even noticable on the wave editor program i use to master. viewing a channel with the coupling caps installed showed nothing out of the ordinary, viewing one without the caps showed terrible offset.
mind you, this was with NE5532s in most of the signal path, and around 10 coupling caps.
ok enough background. In this thread a forum member mentioned that FET input opamps do very well with DC offset and other assorted things that BJT input opamps would have trouble with. I thought about it and since my testing sans caps was done with BJT opamps and I had since replaced several channels with high-end(yes that's subjective but i DO like the sound better..) FET input opamps I decided to do another round of testing.
absolutely NO DC offset detected without caps. the only caps in the channels are the phantom blocking caps and a few in the outboard gear.
I know this isn't as technical as most would like to see but removing 10+ caps per channel does add up to a considerable amount.. however the costs in moving a console over to FET input amps is also very high.
I invite conversation over this topic because it's one that i have rarely seen here.
:thumb: