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Concordant Pre Amplifier Rebuild

To go with the Art Audio Monoblocks, this Concordant pre amplifier has also been redesigned and simplified.

Before the rebuild, a bit of a mess!

The rebuilt pre amplifier is noticeably simpler. The group of four valves on the left is the phono stage and the other two is the line amplifier. Above the preamplifier is the external power supply which has also been redesigned. Originally it used two valves for regulation, these were done away with because they add a lot of noise to the phono HT supply. The phono supply has a better then -80dB S/N ratio and a RIAA accuracy of better than 1dB with an input sensitivity of 2.5mV into 50k for an output of 250mV.

Concordant Pre Amplifier Rebuild
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