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no there is no adapter for this tube there are voltages said that the tube needs to test accurately and should be done with a tester that lists that tube. i applied 9 volts ac to the heater and was not really any difference in brightness so now im going back to the chassis to look for another culprit like in the video output section, matbe something there like a resistor went up in value. if the tube was that bad at 6.6 vac then 9 vac should have brightened it up noticeably but didnt.
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