[time-nuts] Off-Topic Question -- German Composition Resistors

[Robert Atkinson]

May be a bit of drift and reading back to front. Some years ago we bought a quantity of moulded carbon compostion resistors from a top US manufacturer. A sample check showed that none of them met the 10% tolerance. The maufacturer said "bake them for a day two"! The resistors then passed. Why not replace them with modert types you ask? Type approved equipment with the original designers long gone and the current type certificate holder unwilling or unable to approve the change. Welcome to the world of aviation where we are still supporting equipment designed 50 or more years ago.

Robert G8RPI.




________________________________
 From: Adrian <rfnuts at arcor.de>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Sent: Thursday, 21 November 2013, 20:53
Subject: Re: [time-nuts] Off-Topic Question -- German Composition Resistors
 

Hi Bruce,
no. Same color code here.
However, certain carbon composition resistors from the 60's/70's are 
notoriously unreliable. The common effect is drift to significantly 
higher values. Besides that, they can get pretty noisy.
Adrian

Brucekareen at aol.com schrieb:
> While tracing out a PC board from an instrument manufactured in Germany, I
> quickly discovered the color code on 1/4-watt composition resistors is not
> the same as that commonly used in the US  For example, I would measure
> about 10,000-ohms across a presumably good resistor that appeared to be marked
> 2700-ohms.  Has/does Germany used a different code for such parts?
>  
> Bruce, KG6OJI
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