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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 10th Oct 2017, 2:19 pm   #1
cardif55
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Default Oil filled capacitor

I have an old amplifier from 40'S, which capacitor replaces this broken oil capacitor: HELVAR 4uf 1000v?
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Old 10th Oct 2017, 5:14 pm   #2
Cobaltblue
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Default Re: Oil filled capacitor

Hi Cardiff

Something like this would probably do the job

http://www.ebay.co.uk/itm/4uF-1000V-...-/141806934717

Cheers

Mike T
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Old 10th Oct 2017, 5:50 pm   #3
cardif55
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Default Re: Oil filled capacitor

Is it possible to replace it with electrolyte capacitor?
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Old 10th Oct 2017, 7:03 pm   #4
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Default Re: Oil filled capacitor

As an aside, please don't open the faulty capacitor - I believe the oil is classed as a toxic substance these days.
Graham
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Old 10th Oct 2017, 7:10 pm   #5
Neil Purling
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Default Re: Oil filled capacitor

It isn't a general thing that oil containing PCB was used, just some types.
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Old 10th Oct 2017, 7:21 pm   #6
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Default Re: Oil filled capacitor

Quote:
Originally Posted by cardif55 View Post
Is it possible to replace it with electrolyte capacitor?
I don't think you will find an electrolytic capacitor rated for 1000V. You could use two 8uF 500V-rated electrolytics connected in series, but you must use balancing resistors to ensure that the capacitors share the voltage equally. You must also ensure that the ripple current rating on the capacitors is not exceeded. And electrolytic capacitors are polarised, so if the voltage across the capacitor ever changes polarity then you can't safely use electrolytics.

Something like this should work electrically for most applications http://uk.farnell.com/epcos/b32776t0...ial/dp/2677859. But it will be a very different shape and size from your oil-filled one and the connections will be different.

It seems your circuit may be operating at very high voltage. If you are not sure which capacitor to use then perhaps you do not have much experience with high-voltage equipment ? If you are in any doubt about high-voltage safety then please make sure that your work is adequately supervised.

Cheers,

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Old 10th Oct 2017, 7:48 pm   #7
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Default Re: Oil filled capacitor

Quote:
Originally Posted by Cobaltblue View Post
Hi Cardiff

Something like this would probably do the job

http://www.ebay.co.uk/itm/4uF-1000V-...-/141806934717

Cheers

Mike T
Hi Cardiff

If the price is putting you off there are many cheaper capacitors mostly Russian military.

Just do a search on Ebay.

http://www.ebay.co.uk/itm/1x-MBGP-1-...QAAOSwGIRXX~wE

depends what your trying to achieve, authentic, working, pretty

And in case you wondered PCB's are polychlorinated biphenyls very nasty

Cheers

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Old 10th Oct 2017, 8:51 pm   #8
cardif55
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Default Re: Oil filled capacitor

Thank you so much for everyone
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Old 11th Oct 2017, 6:42 am   #9
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Default Re: Oil filled capacitor

Two of these might do - https://www.watfordvalves.com/produc...il.asp?id=3530 . I have some oil filled 4u 600v, what is the HT on your amp, is actually near 1kv or is that just the part used?

Andy.
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Old 11th Oct 2017, 9:37 am   #10
cardif55
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Default Re: Oil filled capacitor

Thank you, but the amp was only a project, and it's too hard for me, I took it for recycling.
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