[TechAssist] Re: Fusible resistors
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 8 Oct 2004 18:08:44 -0400
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> Paul ,B
> > P> Central TV&Video
> > P> 911W Grand Ave
> > P> Grover Beach Ca.
> > P> (805)481-8084
> >
> >
> >
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