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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 20th Jan 2021, 1:54 pm   #1
g4aaw pete
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Default Capacitor date code

I have quite a few of the electrolytic shown. They appear to be made by BHC.
Can anyone de-cypher the date code? My guess is 1986.
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Old 20th Jan 2021, 2:06 pm   #2
Gridiron
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Default Re: Capacitor date code

Week 20 of 1986 if the same date coding method as on I.C's.
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Old 20th Jan 2021, 2:17 pm   #3
g4aaw pete
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Default Re: Capacitor date code

Thanks Mike, that makes perfect sense.
Destined for the dustbin, I think.
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Old 20th Jan 2021, 2:28 pm   #4
barrymagrec
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Default Re: Capacitor date code

Probably re-formable - especially if they`ve never been used.

Plenty of equipment about still working with older caps than that.
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Old 20th Jan 2021, 4:24 pm   #5
Refugee
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Default Re: Capacitor date code

1986 is modern by our standards.
You can reform them easily using a pair of fridge bulbs in series and a diode.
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Old 20th Jan 2021, 6:18 pm   #6
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Default Re: Capacitor date code

Agree! A useful value and certainly can be woken up. I have literally hundreds of new caps and they all reform. Give it a try. John.
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Old 20th Jan 2021, 8:05 pm   #7
Sideband
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Default Re: Capacitor date code

That looks like a replacement smoothing cap for a Philips G11 chassis. It's got the special riveted connections. The originals had a habit of going intermittent, causing a huge spike on the HT rail and ultimately the EHT and blowing a hole through the neck of the tube....

Don't throw them out. Either offer them here in the appropriate section or eBay them.
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Old 21st Jan 2021, 11:50 pm   #8
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Default Re: Capacitor date code

Philips generally recommended reforming at near working voltage with a 47k resistor in series. You should be able to get hem down to 100uA or so after a few hours.
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