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

[Didier Juges]

Must have been Allen Bradley :)
Same problem here with military equipment!


On Thu, Nov 21, 2013 at 4:17 PM, Robert Atkinson <robert8rpi at yahoo.co.uk>wrote:

> 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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