[Boatanchors] 4 or 5 color band carbon resistors

[Greg Werstiuk]

Based on the date, I assume you are speaking of Carbon Composition
resistors.  The 5 band components would be the established reliability RCR
series products most often used in military or other high reliability
applications.  The fifth band specifies the Failure Rate.

- Greg

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net 
> [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of 
> Yong Surk Lee/HL1FB
> Sent: Saturday, May 12, 2007 1:31 AM
> To: boatanchors at mailman.qth.net
> Subject: [Boatanchors] 4 or 5 color band carbon resistors
> 
> Hello
>    I have a lot of 1/2 watt old carbon resistors. Some of 
> them has 4 color bands and some has 5 color bands. I know the 
> 4th color band is the tolerence. 
> what does the 5th one represent? I have an old tube radio 
> made in 1960s. It uses
> 4 band carbon resistors. What year did the 5 band ones introduced? 
> YSL
> 
> 
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