I have this original circuit diagram already for a long time this was attached with the purchase of my trick distortion.BTW, Manfred: perhaps you must check the connection of DISKANT potentiometer in your board, according to this new diagram ?
The circuit of the treble control is shown incorrectly in this.
The circuit redrawn by me have found by tracing my layout.
Also TWSpedals came by tracing his trick distortion to the same circuit of the Diskant control. See also the pictures from this link from the post above.
https://drive.google.com/drive/folders/ ... sp=sharing