PDP 11 gear finally moved

Tothwolf tothwolf at concentric.net
Tue Jul 21 20:51:48 CDT 2015

On Tue, 21 Jul 2015, ben wrote:
> On 7/21/2015 9:04 AM, Lyle Bickley wrote:
>> IMHO, these "white papers" indicating that ALL aluminum electrolytic
>> capacitors decay is obvious nonsense - based on real life experience
>> - not someones theory...
> The whole problem with the caps is the water between foil. As modern 
> caps use more and more tricks to improve the surface area,the water 
> margin gets thinner and thinner.At least with GOOD vacuum tube equipment 
> you could replace caps.

One of those tricks they use in modern aluminum electrolytics is to emboss 
or etch the foil. This gives it more surface area, so they can use a 
smaller amount of foil and obtain the same capacitance. The foil and 
insulator in many modern parts is also much thinner.

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