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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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20th Jan 2021, 1:54 pm
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#1 |
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Heptode
Join Date: Jan 2008
Location: Maidstone, Kent, UK.
Posts: 528
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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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Regards Pete |
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20th Jan 2021, 2:06 pm
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#2 |
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Hexode
Join Date: Apr 2010
Location: West Midlands, UK.
Posts: 376
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Re: Capacitor date code
Week 20 of 1986 if the same date coding method as on I.C's.
Mike. |
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20th Jan 2021, 2:17 pm
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#3 |
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Heptode
Join Date: Jan 2008
Location: Maidstone, Kent, UK.
Posts: 528
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Re: Capacitor date code
Thanks Mike, that makes perfect sense.
Destined for the dustbin, I think.
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Regards Pete |
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20th Jan 2021, 2:28 pm
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#4 |
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Octode
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,015
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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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20th Jan 2021, 4:24 pm
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#5 |
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Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 4,898
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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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20th Jan 2021, 6:18 pm
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#6 |
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Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 7,809
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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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20th Jan 2021, 8:05 pm
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#7 |
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Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 5,996
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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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On Spike Milligan's headstone......I told you I was ill... |
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21st Jan 2021, 11:50 pm
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#8 |
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Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 3,132
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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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