From: Garey Barrell 
Subject: Re: [drakelist] L4-PS R12 burned - .825 ohm 2W resistor on pin 6
 of cable harness


Garey Barrell  made an utterence to the drakelist gang
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Jason -

That sounds like a description of a carbon film or perhaps a ceramic 
composition resistor.  Sounds like someone may have been here before!  
:-)    Also why you got the light show.

73, Garey - K4OAH

jsb{at}digistar.com wrote:

>On Mon, 6 Dec 2004, Garey Barrell wrote:
>
>  
>
>>The 0.82 ohm resistor is actually a wirewound
"flameproof" resistor.
>>The wirewound is identified by the "double width" first color band.
>>The value is also not particularly critical, since in this application
>>it is really nothing more than a HV fuse that will explode on overload,
>>clearing the circuit and protecting the power supply.  NTE offers
>>flameproof resistors in their replacement line, but anything under 1 ohm
>>is difficult to find.  A 1 ohm value is fine in the L-4B.  The metal or
>>ceramic oxide resistors are a second choice, at best.  I don't know what
>>they do under extreme overload.
>>    
>>
>
>Good to hear that NTE makes these resistors.  I hope to get to the local
>parts store on Wednesday to buy a few replacements.
>
>The resistor that blew was blue in color and each end was fluted out, no
>wide color bands as the value of the resistor was stamped on the side of
>it.  But I will look for the wirewound variety first and then carbon.  I
>think the one that was in there probably was the slower type as it didn't
>pop and quit working - I heard a pop and then noticed some
"light" coming
>out from underneath the L4 PS through the ventilation holes, all while I
>was transmitting.  The resistor currently has a value of 400K ohms - hi
>
>
>Thanks for the help - will keep you updated.
>
>
>vy 73 Jason N1SU
>
>  
>
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