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HP CRT filament question
I have an HP 8568B spectrum analyzer which went through shipping
recently. The display unit no longer works and it appears that the CRT section is the culprit. I checked the HV and signals and on the surface they appear OK. I did find some glass chips in the case which leads me to believe the tube is damaged/broken. Taking the CRT out is a pain. I can measure the filament resistance at about 4 ohms. If the tube is cracked or broken, wouldn't the filament burn-up with an infinite resistance?? |
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