After installing the upgrade, I note that LEDs on the c4s board on the A socket do not light up when plugged in. The LED's on the the B side and the Shunt regulator board all light up correctly. Without removing the A side C4s board I have checked all point to point wiring and the pc board and all appear to be correct.
What should be my next step?
All help appreciated.
Robert Howard,
Troy, Al.
Garrard 301/ high mass plinth, SME 312S tonearm/ Sleeping beauty cartridge/ Denon AU 320SUT. Transcendent audio GG preamp and OTL SOB power amp. Blumenstein Orca/Dungeness Speakers
Second system. BH Paramount 300B amps. BeePre. Sony SCD777ES, Wyred4 sound Dac. Mac mini.