Electronics > Repair

[solved]Replacement capacitor, same brand & value, but 3 leads??

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Gen-8bit:
Lol that could very well be the case

Dave Wise:
In the electron tube era, multi-section electrolytic caps were common.  In solid-state equipment, it's almost unheard of, and the third pin is for mechanical support.  Tall thin parts need this - or gluing to the board - to pass shake/vibration testing.

Gen-8bit:
Yes, I indeed accidentally bought the correct value caps when searching for the wrong Voltage, what a derp coincidence lol!

Here they are: https://www.ebay.com/itm/193860551121?_skw=mallory+capacitor+electrolytic+780%CE%BCf+75Vdc&itmmeta=01JDZCFGF8MHPCQZMPP5A86E8C&hash=item2d22fd41d1:g:YEQAAOSwv1hgC3Lj&itmprp=enc%3AAQAJAAABAHoV3kP08IDx%2BKZ9MfhVJKnNrXrEAKvJpn4yVogtP6vutUb0lctWBuSrEHa5o88kBkQOk0VBJULtb1TOeXE3KaDbmyYIuywZ9VOpeTwgn1oUy9kG5iWveR3F6%2FNoU3OUIF9s82mLKa6jIsuJgXpZZ06FZM5QzEwxtNALnP3TnVnstnutwZF4CTaH5xmEeggOIqo%2FO8E0jtOYjyTxScmpoe64ZxgMTbNbqtoesm5PvgFANdnQTj5d2AZ5ckJ4fPa7SioDco4HN%2BmdPPcCXThfXOklWfvCChC%2B9cgW%2FnU%2BhPm%2BzLq8wQqbeti0W1Hi96Zk50geA%2BRirlR%2BBMeKIi3AxvU%3D%7Ctkp%3ABk9SR9iHvuzvZA

factory:

--- Quote from: bdunham7 on November 30, 2024, 07:42:50 pm ---I can't load your eBay link.  Can you post a photo of these 3-legged capacitors? I'm curious. 

--- End quote ---

Try this link instead, there is no need for the rest of the crap after the ebay item number,
https://www.ebay.com/itm/193860551121

David

factory:
For the Mallory capacitor with an extra lead, it's for mounting only, the two leads at the bottom are the capacitor connections, the side of the can indicates the positive lead.



Mallory part is VPR, the attached pdf if from this catalog;
https://www.technicalaudio.com/pdf/Electronics_Catalog_Extracts/Mallory_general_catalog_1985.pdf
Sprague also make this type of capacitor as 672D.
https://www.vishay.com/docs/42054/672d.pdf

This is one way these three lead caps were intended to be used, the extra lead is just for mounting purposes only, picture from a HP 5328A. The Mallory part is vertical use only, as the third lead is sleeved to the can.



David

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