Postby Mats A » 06 Oct 2013, 21:12
My brother has converted my Marshall JCM 900 SL-X 100 Watt who originally had 5881 valves to EL 34´s using a Marshall conversion manual i got plus an SL_X schematic with EL 34´s i got at the Marshall factory in 1993. Question is how should the bias be set? According to a schematic on Dr Tube it should be set at -45. We can only get it to 38.