I used my Audio Precision SYS2722 system to examine the Octave Jubilee Mono SE’s measured performance. I followed the instructions in the manual to check the bias of the eight output tubes after running the amplifier for 30 minutes to allow the operating conditions to stabilize. The pots that allow the bias for each tube to be optimized have a somewhat coarse action. The best I could arrange was for the bias for the tubes to lie between “1005” and “1025” as indicated by the digital meter on the amplifier’s top panel.
