Electronics > Repair
Help Identifying Vintage Component
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T3sl4co1l:
Nah not tant, looks more like M39018 series aluminum electrolytic to me.  Example: https://www.tti.com/content/dam/ttiinc/manufacturers/barker-microfarads/Resources/bmf-min-axial-alum-caps.pdf

Tim
Swainster:
If it was a mil spec cap (and it certainly looks like one) then it would make sense that '4070' was the dash number... which in turn suggests that the capacitance is 6.8uF. However, if it was part of the M39018 series aluminium eletrolytics then the voltage would be 250V, with an obsolete tolerance code. On the other hand, if it was a M39003 tant then a '4070' makes a lot more sense - it would be 6.8uF 50V ultra high reliability, however the epoxy end cap doesn't make sense. Size wise, hard to say from the pic, but the tant option looks more plausible.

Conclusion, maybe 4070 is a red herring...

Cut it open to see what it looks like inside?
fzabkar:
Modern tants in a similar looking package:

https://web.archive.org/web/20200925215647/www.mallory-sonalert.com/tantalum/articles/TS5%20Data%20Sheet.pdf
http://www.newyorkerelectronics.com/Mallory_Sonalert_TS5_Tantalum_Capacitor
floobydust:
Very early, tantalums were known for high reliability and used in military and aerospace. So I say it's not an electrolytic.
Logo "H" OK I found the manufacturer is Hilton Capacitor but no joy on 4070 part number.
fzabkar:

--- Quote from: floobydust on May 22, 2023, 04:38:32 am ---Logo "H" OK I found the manufacturer is Hilton Capacitor...
--- End quote ---

https://web.archive.org/web/20050210214206/http://www.tantalum-pellet.com/

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