Phono 2 Preamplifier
This is the matching phono preamplifier to go along with the Stereo 4
amplifier, which has only line-level inputs. The circuit topology is
similar to the Stereo 4 amplifier. It is direct coupled from input to
output. The preamplifier features passive RIAA equalization with the
unique feature that the equalization network is driven by a current
source. I designed and built this preamplifier in 2001.