New Doug Self pre-amp design...

[jack]

Just a heads-up...

This month's Elektor (April 2012, dropped on the mat this morning...) has a long article by Doug Self with, what he says is, his first published new pre-amp design since 1996. Side notes on Peter Baxandall, references to "Baxandall and Self on Audio Power" - all sorts of stuff. Pt. 1 is about design methodology and his pet subjects of sources of noise & distortion - does include the schematic though.

Kind of fun... (if you are a Self-devotee)

Specifications
Test conditions: supply voltage ±17.6 V; all measurements symmetrical; tone control defeat disabled.
Test equipment: Audio Precision Two Cascade Plus 2722 Dual Domain (@Elektor Labs)
THD+N (200 mV in, 1 V out) 0.0015% (1 kHz, B = 22 Hz - 22 kHz)
0.0028% (20 kHz, B = 22 Hz - 80 kHz)
THD+N (2 V in, 1 V out) 0.0003% (1 kHz, B = 22 Hz - 22 kHz)
0.0009% (20 kHz, B = 22 Hz - 80 kHz)
S/N (200 mV in) 96 dB (B = 22 Hz - 22 kHz)
98.7 dBA
Bandwidth 0.2 Hz - 300 kHz
Max. output voltage (200 mV in) 1.3 V
Balance +3.6 dB to -6.3 dB
Tone control ±8 dB (100 Hz)
±8.5 dB (10 kHz)
Crosstalk R to L -98 dB (1 kHz)
-74 dB (20 kHz)
L to R -102 dB (1 kHz)
-80 dB (20 kHz)

As usual, Elektor are selling the boards (about 19 quid each).

[Nick]

I have his book somewhere I should read some time.