Well I did ... I played a lot with Pass B1 and also with Musical Fidelity 10D V2 - a tube buffer based on E88CC with global feedback.
The usage of active buffers has its purpose if the output impedance of the passive preamp is too high. Too high means if it is less than 10 times of the input impedance of the amp to which this preamp is connected. This 10 times shouldn't be understood as an exact relation but rather as an approximation. Some other parameters of the amp play also an important role: sensitivity of the amp, gain of the amp, etc. The best way to find out whether you have issues with passive preamp is to hear it together with your amp ... and then you will see. In addition, active buffers do change a sound a bit, so it is really a matter of taste whether you like it more with or without it .... of course if the issue with the output impedance is not critical.
So, my strong advice to you is to try it first and then to make a decision upon what you hear.
The usage of active buffers has its purpose if the output impedance of the passive preamp is too high. Too high means if it is less than 10 times of the input impedance of the amp to which this preamp is connected. This 10 times shouldn't be understood as an exact relation but rather as an approximation. Some other parameters of the amp play also an important role: sensitivity of the amp, gain of the amp, etc. The best way to find out whether you have issues with passive preamp is to hear it together with your amp ... and then you will see. In addition, active buffers do change a sound a bit, so it is really a matter of taste whether you like it more with or without it .... of course if the issue with the output impedance is not critical.
So, my strong advice to you is to try it first and then to make a decision upon what you hear.