flyback cooling

[DaveWM]

Originally Posted by andy

Most RCA chassis have a high line voltage tap on the power transformer primary. This can help a lot with flyback temperature. Also, make sure your HV system is operating properly (check HOT current and shunt regulator current). The shunt regulator should see about 1mA on a black screen.

I am on the 128v tap now, that reduced the HOT current some. Its at about 198ma shunt it about .8-1ma, HV is about 23kv.

control grid of the HO tube is -47 with with a vtvm, screen is 140v grid drive is 200v PP with the correct form, replaced the .01 coupling cap, adj the eff coil for max dip.

Diff 6DQ5's were used there where minor changes in both current and screen voltage, I settled on the one with the lowest cahode current and screen voltage.