Quote:
Originally Posted by old_coot88
...250 ma?  When we sold those sets new, 210 ma was the absolute limit for any hope of making it through warranty without killing the 6JE6.
200-205 ma was just about optimal.
The factory manual tells you to adjust to the dip, then raise the current off-dip a bit. But that's nuts. It doesn't state any rationale for raising it. So just set it to the dip, period. |
The raising above the dip is to bring the sweep into a linear region of the sweep - just watch the CRT with a cross-hatch and look for any non-linearity in the picture. If any, raise the dip. I've always gone for the dip, and never had a non-linear horizontal sweep after dipping. I have seen weak 6JE6's cause linearity problems.
We had a similar procedure in the world of Avionics - dipping current in driver and output tubes in VHF and UHF radios and one '50s TACAN unit. What fun - blade tracking and turn-loc coils, all one handed operation, as there was -900 volts on some coils.....