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Old 8th May 2021, 8:01 pm   #1
Steve Gibson
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Default Admiralty capacitors - suggestions

As part of a recent Hall I have a pretty grubby homelab type 10 signal generator.

There's some really interesting looking caps in there Admiralty 1.0MFD 1000V that I'd like to keep the cases on.

Does anyone have experience in fitting these things and filing with modern caps?

Cheers

Steve
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Old 8th May 2021, 8:03 pm   #2
Ed_Dinning
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Default Re: Admiralty capacitors - suggestions

Hi Steve, they are a paper in oil type and normally very reliable. If you can test at working voltage and they are not leaking I would continue to use them

Ed
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Old 8th May 2021, 8:28 pm   #3
M0FYA Andy
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Default Re: Admiralty capacitors - suggestions

I agree with Ed, there's every chance these are as good as the day they were made!

Andy
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Old 8th May 2021, 8:35 pm   #4
factory
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Default Re: Admiralty capacitors - suggestions

I repaired a GEC LCR bridge recently with some of these large capacitors, they all tested fine at the rated voltage. Which is just as well as a 2MFD block is used a reference capacitor, with hand written note of 1.95 on the back, the ordinary paper capacitor used to trim the value to 2MFD was knackered though.

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Old 8th May 2021, 10:04 pm   #5
joebog1
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Default Re: Admiralty capacitors - suggestions

I believe many of these PIO caps were filled with PCB too!!. I would be very careful when handling the oil and oily insides.

Joe
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Old 8th May 2021, 10:52 pm   #6
Steve Gibson
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Default Re: Admiralty capacitors - suggestions

Thanks guys, that's good news I'll check them out!
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Old 9th May 2021, 5:55 am   #7
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Default Re: Admiralty capacitors - suggestions

Take care not to get any ex-capacitor oil on you or your surroundings. Some of them used PCBs type oils. There's no easy way to tell, so treat it all as risky.

David
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