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Use a HV microwave capacitor for HV CRT of RCA vacuum tube scope ?
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Topic: Use a HV microwave capacitor for HV CRT of RCA vacuum tube scope ? (Read 859 times)
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lordvader88
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Use a HV microwave capacitor for HV CRT of RCA vacuum tube scope ?
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January 25, 2018, 08:36:51 pm »
I have an RCA-WO33A vacuum tube oscilloscope. Its was dropped hard and the transformer broke loose, cracking the PCB in half and bending the frame/etc. Probably broke 2 tubes as well. The replacement tubes and caps got here today. But I don't have a 0.5uF >700V capacitor. But I do have 2 or 3 big microwave oven caps. I have to dig them up. But if they are rated about 0.5uF is there any reason they might not work well at 60hz from a rectifying valve/tube ? Its for the CRT
http://rhetoricity.com/misc/tubes/oscope/RCA-Oscilliscope-WO33A.pdf
Its C40 on the mid-right
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Last Edit: January 25, 2018, 08:53:22 pm by lordvader88
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Yansi
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STM32, STM8, AVR, 8051
Re: Use a HV microwave capacitor for HV CRT of RCA vacuum tube scope ?
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Reply #1 on:
January 25, 2018, 08:41:24 pm »
They will work absolutely fine with 700V.
Just note there is usually a discharge resistor built in the cap, so you may see a false leakage current. It may or may not be a problem, depending on the circuit where you will use it.
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james_s
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Re: Use a HV microwave capacitor for HV CRT of RCA vacuum tube scope ?
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Reply #2 on:
January 25, 2018, 10:14:15 pm »
Remember that a microwave capacitor is used with 60Hz powering a vacuum tube in its native application.
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