Hi,
Just finished 4 x Copper pre's and I'm glad to say I've had great success! They are sounding awesome!
Just a question though. I ran a 1k sine wave through each pre just to have a rudimentary look and listen at the distortion that occurs as the gain is increased. Everything is working fine (can't wait to colour a snare!!), however, I noticed that there is a steady 1db fluctuation when I have the gain cranked to 10. Over the course of 14 secs, the signal rises and falls by 1db (see pic attached). This is the same for each pre.
As I lower the gain, the amount of db of fluctuation decreases. It becomes negligible once gain is down to 3db and less.
Any thoughts? I'm a bit worried that the common denominator is the Lindell chassis
Cheers,
Walshy