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RE: [N8VEM-S100:2072] Reforming Capacitors



They aren't large cans, they are axial caps and look like a size C battery.  3,300uf, 15V. 
Which is why I want to reform them.

I feel absolutely no heat on any of the chips.  They are all cold to the touch.  I'll leave the system running like this for 24 hours, that should be plenty.

I wasn't so concerned when I fired up the IMSAI, it uses those large "computer grade" capacitors.
I totally agree with you about those large cans.  They are much better sealed and have much more liquid.  Perhaps in 100 years, they might be an issue?  I read about reforming capacitors, it's more critical to do so on capacitors from the 50's and 60's.  The caps from the 30's and 40's are typically lost causes, but there are places that will rebuild them! or you can go the easy route and just gut the old can and install new caps inside the old cans.

:)J




From: mon...@vitasoft.org
To: n8vem...@googlegroups.com
Subject: RE: [N8VEM-S100:2072] Reforming Capacitors
Date: Wed, 27 Nov 2013 20:29:09 -0800

I’m guessing but probably not.

Are you concerned about the power supply can caps or those on the board.  For the large cans if there are no leaks of oil and the black seal is not cracked I never had a problem firing them up to full voltage.

Was I just lucky?

 

John

 

 

From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Crusty OMO
Sent: Wednesday, November 27, 2013 7:29 PM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:2070] Reforming Capacitors

 

I'm finally getting around to firing up the ALTAIR 8800.
The capacitors look small and I think I want to reform them.
I'm presently running 24VAC into the unit through a dim bulb.

The front panel does not easily disconnect from the power supply (no connector, hard wired).
I'm hoping I don't need to trouble shoot the front panel.

But, with 24VAC in, there's 1V on the 5V line.  Does anyone think it might damage TTL?

My guess is that this voltage is way too low to turn on any transistors. 

Your thoughts anyone?

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