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I never saw a CRT tester like that but it is probably OK as it looks like a 70s model.
Those TVs normally draw 200 watts at 120 volts, so placing a 100-watt lamp in series will start out at less than 50 volts, likely showing very little action. This is a very useful technique on solid state TVs where there is need to know of a low-impedance fault (dead short) before moving on
If you were to place two 100 watt lamps in parallel, that would be more like 60+ volts and be more useful for taking some measurements to see if the rectifiers and filter capacitors are working.
Good Luck, you're on the right track being safe and cautious.
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"When resistors increase in value, they're worthless"
-Dave G
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