[Hallicrafters] re capping Hallicrafters

[EXT-Craft, Clifford H]

Paper caps have large amounts of internal inductance and should not be used very high in frequency. Ceramic caps are newer than paper caps and have replaced them for most uses. Mica caps are for rf usage and are usualy used in aplications that require high stability. Newer types like mylar are generally better than the old paper type and much more stable over time.
One mistake some make is replacing electrolytic caps with one of a higher voltage, this will accelerate the aging of the cap. There usedto be a working voltage rating on caps and on electrolytics, this was necessary not only to prevent use at a higher voltage,but also prevent lower voltage use which will not maintain the electrochemical reaction know as "forming" and the capacatance will fade over time.
Cliff wa0rox

-----Original Message-----
From: Gary Benoit [mailto:gbenoit at shaw.ca] 
Sent: Tuesday, July 12, 2005 12:28 PM
To: Hallicrafters at mailman.qth.net
Subject: [Hallicrafters] re capping Hallicrafters


Well as long as we are discussing caps, can anybody explain the differences between orange drops and ceramic caps? I want to recap a couple of radios and everybody seems to lean towards orange drops, I have heard that ceramic caps are supposed to be reliable. Do they act differently than orange drops? Is sound a factor? Other than the values of specific caps in my radios why there are so many different types of caps in use in each one.  I.e. ceramic, paper, mica, I am so confused. Hope I am not going over stuff that has already been discussed. Thanks 

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