hi, i have made some mesure on the tube operating points first triode of the 5697 i 'v got 101V anode to grid voltage 4,7cathode voltage making a small 4mah bias
second triode : 260V anode to grid voltage , 13,5V cathode voltage making 9mah bias
when you look at the plate/voltage schematic of the 5687 you could see these operating points are not very optimal ( not linear parts of the curves) . is someone ever try to run them harder ?
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Topic - 5687 operating points DAC Kit - juanitox 13:31:24 04/10/11 (2)