john12ax7
Well-known member
Application is a Trident style EQ. I started with the TL071 and TL072 combo (two of each) since that was the original opamp. All opamps bypassed with 0.1uF from each rail to ground.
I should first say I'm not really fond of the sound of the TL071 series, even when not driven hard. Switching out all the opamps to TLE2071 and TLE2072 sounds MUCH better to me.
Here is some data before and after (note there is heavy averaging going on). Don't read too much into the raw numbers, it's not a calibrated measurement, but it's useful for comparison purposes. There is a 1 kHz test tone at -6 dBFs, the measurement is zoomed in to see the low level signals.
First the EQs are hard bypassed, so you see the effect of the converter itself and also some of the 500 series power supply that might be coming in.
I should first say I'm not really fond of the sound of the TL071 series, even when not driven hard. Switching out all the opamps to TLE2071 and TLE2072 sounds MUCH better to me.
Here is some data before and after (note there is heavy averaging going on). Don't read too much into the raw numbers, it's not a calibrated measurement, but it's useful for comparison purposes. There is a 1 kHz test tone at -6 dBFs, the measurement is zoomed in to see the low level signals.
First the EQs are hard bypassed, so you see the effect of the converter itself and also some of the 500 series power supply that might be coming in.