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MCampbell 10th February 2011 01:27 PM

Plessey Red/Yellow/Black Electrolytics
1 Attachment(s)
Can anyone please advise the polarity of the 1960s red/yellow/black Plessey electrolytics?
Picture attached.



DF96 11th February 2011 11:03 AM

My guess is red positive, black negative - this is a common colour convention. Can you work it out from how it was used in the circuit?

MCampbell 11th February 2011 11:09 AM

I also presumed that this convention would apply. However, this is for my customer, who wants to be absolutely sure he's fitting it the right way round. Also I don't have view of the circuit. Ho hum. Thanks for your help....

barrymagrec 11th February 2011 05:19 PM

I used some of these back in the late 60`s. I always connected them red positve and black negative, never occurred to me to do anything else. They always worked.


MCampbell 14th February 2011 09:01 AM

Thanks for that - all is as expected!

cliffforrest 14th February 2011 11:27 AM


Originally Posted by MCampbell (
Thanks for that - all is as expected!

I worked in the Plessey factory in Swindon some 45 years ago .....

Red = + it is.


MCampbell 14th February 2011 11:51 AM

Thanks Cliff - I think it's pretty definitive then!

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