bluebird
Well-known member
I'm wet/dry mixing a direct (through one opamp buffer) signal with a signal thats going through an input transformer, output transformer and tubes. The tube/transformer signal is about 35 degrees phase shifted from the dry signal at 20Khz. Its a lot better at about 15K. But when I mix the wet and dry I'm getting a roll off from about 15K to 20K. Its about 1db down at 20K nothing I can't live with but it would be nice to be able to phase shift the dry signal up top to match the tube/transformer signal.
Any tricks I can do to the buffer op amp to shift the phase up top a little?
I noticed a TL074 worked a little better than a Mc33079 because its a little slower of an opamp. do they make a 741 in a quad? Maybe that will be sh*tty enough to match the transformer... Wow never thought I'd be looking for a crappy op amp!
Oh and the mixer is just two buffers into a virtual earth op amp via resistors.
Any tricks I can do to the buffer op amp to shift the phase up top a little?
I noticed a TL074 worked a little better than a Mc33079 because its a little slower of an opamp. do they make a 741 in a quad? Maybe that will be sh*tty enough to match the transformer... Wow never thought I'd be looking for a crappy op amp!
Oh and the mixer is just two buffers into a virtual earth op amp via resistors.