[Chad Hauris]

The way I set the kinescope bias control is to set up the screen controls with the service switch in the service position...if one of the controls doesn't produce a line, then increase the kine. bias control (or switch) till each color screen control can produce a dim line with the tuner tuned off channel or the IF lead removed from tuner...this is the procedure I have seen in the RCA service books.

The kine. bias control allows you to compensate for crt aging...on all controls such as screen, bright, bias etc. I would think that the lowest setting that produces best results is best for crt life.

I have seen bad resistors in the 6BK4 cathode/grid circuit cause a problem with improper 6BK4 current. It's a good idea also to check the setting of the HV control as many times people have messed with it causing improper regulator current.