@koestner It doesn’t solve your inquiry completely, but Modwright released his Analog Bridge about nine months ago. I was one of the beta testers for the unit. It is meant to be placed anywhere you desire, especially between preamp and amp if applicable, or just between a source and preamp. It’s not cheap, but it is very high quality and offers a good amount of flexibility in the three tube types it supports.
A Black Box to Solve Everything
Tubes vs. solid state?? There's a thread out right now about this exact question (there always is), but I didn't want to take it off subject. So my question is; is there a device that could go between the preamp and amp that has variable harmonic distortion capabilities? I know there are tube buffers, but they are not really addressing the point because they use line level signals and don't have the distortion of a good 300B tube being pushed beyond its limits. My thinking is that of a black box with switches and knobs to adjust harmonic distortion to mimic different tube types. It would also have to have a bypass switch so we could readily and quickly A/B the thing. Any ideas?