[Milsurplus] Fwd: Advice on which caps to keep ( even longer )

[hwhall@aol.com]

 The cap value "dividing line" between what's mica vs paper is very fuzzy.  I have NOS mica caps whose values would've suggested they were paper.  I've also seen in RBM parts lists, paper caps specified whose small value would've suggested mica.
There was a dot color coding system that had a paper/mica color dot but there were so many "standard" schemes that I hesitate to rely on dot reading for values, etc.  Some folks say they've noticed a correlation between body color or body dimensional ratios to sort Micamolds, but again, so much changed back then during manufacturing.  And I'm not sure that Micamold was the only maker "guilty" of making mica-looking caps with paper inside.
WayneWB4OGM
    On Tuesday, August 29, 2023 at 09:35:02 PM MDT, Al Klase <ark at ar88.net> wrote:  
 
  Not necessarily so!  The troublesome (paper) Micamolds have higher values, e.g.  0.1 uF.  The smaller ones, say 1000 pF and down, are likely mica.  there might actually be an indication on units with 6-dot color codes, but I don't remember the details.
 
 Al
 
 On 8/29/2023 9:53 PM, hwhall at aol.com wrote:
  
 
 " Toss any which say "Micamold". They aren't mica: they are paper..." 
  This is not 100% true. Micamold made real mica capacitors, too.  
  Wayne WB4OGM  
      On Tuesday, August 29, 2023 at 07:39:51 PM MDT, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:  
  
   On 29 Aug 2023 at 19:51, Hubert Miller wrote:
 
 > Also i have a box of maybe 1000 more or less of "postage stamp" type
 > caps. First level sorting, which makes and marks are bad news and can
 > be tossed without second thoughts ? thanks- -Hue Miller
 
 Toss any which say "Micamold". They aren't mica: they are paper and every one I have 
 tested was leaky, some very badly leaky, and some even dead-shorted.
 
 If you really want to test your caps, I can send you my other rebuilt Heathkit C-3. I have two.
 
 I recently rebuilt a couple of National NC-57s, which were full of those Micamolds. There 
 wasn't one single one of them which was worth keeping.
 
 Ken W7EKB 
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 Al Klase - N3FRQ
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 http://www.skywaves.ar88.net/
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