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oil filled cap

acdc90
acdc90 over 1 year ago

Hello

i Love my job as every day is different

Today i was looking at a 5gallon ultrasonic Bath 

 this is only the 2nd time it has been repaired since

made in America in 1982

they kept making upto early 2000.   yes good old stuff just keeps going 

this has 4 of 811a transmitting Valves in it 

anyway the cap that i need to replace is made by General electric 

0.25MUF 2000v     CP70E1EJ254V    CAT 22F191G2

AND  oil filled  so can not be exported 

i do not know the characteristic's of oil filled caps .   Can someone say what is better to put in 

strange circuit  this cap is after the choke from the high voltage transformer (over 1000v AC) "NO rectifier "

if i find the circuit i will put it up  (probably on 30 parts in circuit)  

FROM this cap supplies "dirty DC" voltage to Tank coil to plate of valve

the grey cap i want to replace is under the choke on the left  

image

 

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  • colporteur
    colporteur over 1 year ago +1
    Some oil can capacitors contained PCB's that were carcinogenic. Take care if you are disposing of them.
  • michaelkellett
    michaelkellett over 1 year ago in reply to anniel747 +1
    You're right. 0.25uF @ 2000V is more credible. https://www.tedss.com/CP72E1EJ254K1 But why does it say 0.25MUF - some capacitors are marked MU for mu as in micro. MK
  • misaz
    misaz over 1 year ago in reply to michaelkellett +1
    I am not expert on old tech, but I found that M maybe mean tolerance +-20%. Source: https://electronics.stackexchange.com/questions/464076/old-capacitor-markings-m-letter-actual-capacitance
  • anniel747
    0 anniel747 over 1 year ago

    A 2000V 250µF capacitor wont be that easy to find.

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  • colporteur
    0 colporteur over 1 year ago

    Some oil can capacitors contained PCB's that were carcinogenic. Take care if you are disposing of them.

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  • michaelkellett
    0 michaelkellett over 1 year ago in reply to anniel747

    You're right.

    0.25uF @ 2000V is more credible.

    https://www.tedss.com/CP72E1EJ254K1

    But why does it say 0.25MUF - some capacitors are marked MU for mu as in  micro.

    MK

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  • misaz
    0 misaz over 1 year ago in reply to michaelkellett

    I am not expert on old tech, but I found that M maybe mean tolerance +-20%.

    Source: https://electronics.stackexchange.com/questions/464076/old-capacitor-markings-m-letter-actual-capacitance

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  • robogary
    0 robogary over 1 year ago

    Those caps were also used as snubber caps and line filters in 1980s vintage DC drives and other smaller kW power controls. Maybe they can be found as old spare parts in salvage sellers. 

    Otherwise you may have to make a cap bank out of lower voltage caps and balance resistors. 

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  • kmikemoo
    0 kmikemoo over 1 year ago in reply to michaelkellett
    michaelkellett said:
    But why does it say 0.25MUF

    My best guess is μ = Mu. I couldn't find anything definitive, but it was a fun rabbit hole to look down.

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  • anniel747
    0 anniel747 over 1 year ago in reply to kmikemoo

    Or Megapicofarad.

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  • dang74
    0 dang74 over 1 year ago

    Those valves look amazing 

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  • dougw
    0 dougw over 1 year ago

    I can't help with the cap, but it is an interesting piece of gear.

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  • michaelkellett
    0 michaelkellett over 1 year ago in reply to dougw

    No probs (except price) getting the cap:

    https://www.mouser.co.uk/ProductDetail/Cornell-Dubilier-CDE/SCRN246R-F?qs=9I6i58cghuuiemX56AYrfA%3D%3D

    or cheaper here:

    https://www.tedss.com/CP72E1EJ254K1

    MK

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