Rogerio,
It occurred to me after my post is if you question if a resistor in the string is bad, unsolder one lead of one resistor. This makes the circuit an open circuit to anything on either end. Then you can test each resistor to see if one or more need to be replaced. You may have to put the selector to one end, CW or CCW. I have done this like Barry did to find an open resistor in the time base of a 7B92A. In your case, the condenser charging causing the reading to slowly change as it charges through the resistors will not happen. This test can be done in the high voltage bleeder in the crt circuits to find bad resistors.
See if you have any leakage paths causing the problem. If you have already cleaned the area, you can skip this suggestion/question.
Let us know what you find as the problem. I am curious to know. You will find your problem.
David's reference made me laugh. Thanks for the Sat. morning smile. The reference to high tension would fit me since working at higher voltages, usually three digits, is something I have done for many years. For those that know NTSC, my sync circuit lost sync for a while.
Mark
