[Heath] Yet more on my IP-27...

[Ron]

 > don't leave those old electrolytics in there!

I am not sure I agree. I've restored many, many Heathkit instruments 
and in just
about all, electrolytics that measured OK stayed that way for a long 
time. Of course,
all electrolytics will go bad *eventually* -- including brand new 
ones -- but this may
happen 20 years later, or 50 years, or tomorrow...

-- Ron




On 6/21/2012 9:20 PM, Robert Groh wrote:
> If it makes you feel any better, your lesson is an excellent 
> object lesson for all of us who rebuild old stuff - don't leave 
> those old electrolytics in there!  If they aren't bad now, they 
> will be shortly.
>
> Oh, and a giant 'atta boy!' for persisting and getting that bad 
> boy all fixed up.  Nice work.
>
> 73
> Bob, WA2CKY
>
> --------------------------------------------------------------------
> *From:* Kenneth G. Gordon <kgordon2006 at frontier.com>
> *To:* Heath at puck.nether.net
> *Sent:* Thu, June 21, 2012 5:24:10 PM
> *Subject:* [Heath] Yet more on my IP-27...
>
> Well, the unit is back on the bench. Poop! :-(
>
> While I was characterizing it, the 3000 MFD 75 VDC capacitor 
> decided to
> "take a hike": i.e., it shorted out internally and blew two of the 
> four diodes in
> the FW bridge along with the fuse.
>
> All transistors appear to be OK.
>
> This makes 3 of the electrolytics in that PS which have either 
> been bad to
> begin with, shorted out while I was fixing the PS, or shorted out 
> after I had it
> working.
>
> I am going to replace ALL of them with new ones.
>
> Gee....
>
> Now, after I replace the caps,  all I will need to do is to find a 
> can of Krylon
> "Make it Suede" #1241 Buckskin to re-do the cabinet. So far, no 
> luck on that
> yet either.
>
> vy 73,
>
> Ken W7EKB
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