The following is a revised AL-80B power supply board schematic. It also
applies to all amplifiers in the AL80 mainframe with suitable changes in R106
J101 pin outs CCW from top view at index:
|1||(-) meter plate current|
relay from STBY-OPR switch
voltage metering, 1 mA = 3500V
meter (+), plate current meter (-)
C101 is SWR compensation on bypass. Value can change.
C106 is release time for auto-bias. See
EBS electronic bias page for circuit description.
Additional revised schematics will appear on this page.