BluesBox - Tweaks and Samples

The source of a lot of noise and the chirping sound turned out to be the tone stack driver. The noise could be eliminated by bypassing the tone stack. So the noise was obviously added to the signal path. However, the chirping sound remained even after bypassing tone stack. Therefore, the tone stack driver circuit introduced the chirping sound on the signal ground. Nasty!

Since I had enough of overall gain to work with, I decided to go for a simple solution. I disconnected the tone stack driver circuit (the recovery amplyfier part of it) and put the passive tone stack after the tube gain stage. To be able to model the sound going into the distortion stage a little bit, I added a sinple passive variable bass cut between the pre-gain stage and the tube stage.

The following movie shows the final result. The second movie shows the BluesBox in action.