by azazello » Wed Apr 15, 2015 12:40 pm
For fixed bias You need minus U about 40-50 v connected to two grid resistors of KT88 /grid res-s 470 kohm disconnect from ground and connect to minus U cross adjusting trimmer resistors about 20-50 kohm and adjust plate currents the sames, that was in autobias mode/. Your power transformer must have about 50 VAC/.
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L&E80CC Siemens&Tel-n.