[TechAssist] Re: Fusible resistors
- From: Edward Gaidies <teltek3@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 8 Oct 2004 21:06:56 -0400
Just quickly read it..
Sounds legitimate.
My problem...on a Tech list...it's like asking...My Amplifier keeps
blowing my 5 Amp fuse...is it OK to use a 7 Amp.
We should know better.
I can see it with swapping out solid state components, sometimes we
have something in stock that may even exceed specs..but fuses should
not present much of a mystery.
It's a fair subject..after all it's the weekend.;-)
-Ed-
*****************************************************************
Ed Gaidies
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
teltek@xxxxxxxxx
On 8-Oct-04, at 6:08 PM, J Silverman wrote:
> Fusable resistors use an element that becomes permanently
> none-conducting
> when it gets too hot. For example tin becomes tin oxide, aluminum
> becomes
> aluminum oxide, carbon becomes carbon dioxide. Flameproof resistor
> could be
> just a nichrome element encased in ceramic. If it gets hot enough to
> melt
> the nichrome, without exploding, the nichrome is still conducting
> melted and
> just becomes nichrome metal again when it solidifies. Flameproof
> includes
> fusable by law.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> Fax/Phone 864 232 3889
> mail to: greentron@xxxxxxx
> ----- Original Message -----
> From: "larry" <schntv@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, October 08, 2004 5:29 PM
> Subject: [TechAssist] Re: Fusible resistors
>
>
>> i am not sure about this, but any resistor that is the flame
>> proof type, will open with out shorting first. so i guess it
>> could be considered a fuse.
>> but the true fusable resistors will open before as much damage
>> is caused, waiting for a resistor to burn out.
>> just my opinion,
>> Larry
>>
>>
>> Bil Green wrote:
>>
>>> Hi Paul,
>>>
>>> I've seen them burn up instantly too. That's why I use metal
>>> film resistors to replace fusibles.
>>>
>>>
>>>
>>> Bil Green
>>> PC 1000
>>> Mammoth Lakes, CA 93546
>>> 760-924-1000
>>>
>>> Friday, October 8, 2004, 10:18:54 AM, you wrote:
>>>
>>> P> Hi Ken,
>>> P> the reason for the question was that I am working on a set that
>>> calls
> for a 5.6 ohm fusible that was open. I replaced with a flame proof and
> it
> smoked and opened immediately. I cant imagine a
>>> P> fusible opening any faster than the flame proof in this case
>>> anyway.
> I found the problem and tacked in another flame proof. The job is
> finished
> except the fusible. I suspect that a good many sets
>>> P> have been repaired by subbing the flame proof for a fusible. That
> may not make it advisable though. I know that I and the majority of
> techs do
> not want to compromise the safety of a set.
>>> P>
> Paul
>>> P> .
>>> P> gulftech@xxxxxxxx wrote:
>>> P> Paul,
>>>
>>> P> I have done so in many sets, but not all. A certain supplier
> advertised
>>> P> the Sony 0.1 ohm resistors at a very good price. Flyer said Sony
>>> P> originals. I ordered 20. What they sent was 0.1 ohm flameproof.
>>> The
>>> P> first time one of my techs used one it blew up like a firecracker.
> True,
>>> P> he had missed something in rebuilding the supply, but the Sony
> originals
>>> P> will fail quietly and, I suspect, much quicker. I threw the rest
>>> of
> the
>>> P> resistors I got into the trash.
>>>
>>> P> Have not used that supplier since then.
>>>
>>>
>>> P> Ken Smith
>>> P> Gulf Technical Services
>>> P> 3034 Gulf Breeze Parkway
>>> P> Gulf Breeze, FL 32563
>>> P> 850-934-8324 (Voice), 850-932-0819 (fax)
>>>
>>> P> On Thu, 7 Oct 2004 18:57:37 -0700 (PDT) Paul
>>> P> writes:
>>>
>>>>> Is a flame proof resistor a safe sub for a fusible resistor of the
>>>>> same value?
>>>>> If not why not?
>>>>> Paul
>>>>>
>>>>>
>>>>> Paul ,B
>>>>> Central TV&Video
>>>>> 911W Grand Ave
>>>>> Grover Beach Ca.
>>>>> (805)481-8084
>>>>>
>>>>>
>>>>>
>>>
>>>
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>>> P> Central TV&Video
>>> P> 911W Grand Ave
>>> P> Grover Beach Ca.
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>>>
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