Copyright 1976 November Wireless World An Advanced Preamplifier by Douglas Self

Douglas Self's audio design books are also recommended on Github: How to learn modern electronics

This is the most musically sounding preamp I have built. The photograph shows the two normalization and tone control PCB's constructed in the middle 1980's, re-housed in a recent (partially) 3d-printed, case. The input level control is at the back of the case.

Listening during the past year (2020/2021) to this preamp driving a linear-PSU-powered class-D-amp prompted the construction of a second preamp - the unpopulated PCBs have been made and the components obtained. More details are in the AdvPreAmp2021Build folder including the Fritzing PCB layout files. (No, it is not cool to have to create a schematic, if all that you want is a PCB based on a perfectly good schematic that you already have. Note 1 Note 2) An old trick that I use to make the PCB photomasks is to laserprint on normal white paper, rub some sunflower oil over the non-toner side, and then let it dry for 24 hours.

The Preamp electronics have been completed - only the case is left to make or print:

This turned out to be almost half the size of the 1980's based preamp, and puzzlingly it has a distinctly different sound (but neither better nor worse), than the older preamp.