From: paulguy@eastlink.ca   
      
   On Tue, 18 May 2010 16:25:08 -0400, Dick Pierce   
    wrote:   
      
   >guy25 wrote:   
   >> Thanks Peter,   
   >>   
   >> I talk to digikey on the phone but they do not carried 7W only 10W in   
   >> stock. Don't you think it works?   
   >   
   >Like others have said several times, YES, it will work.   
   >   
   >Increasing the wattage for 7 to 10 watts, or from 7 to   
   >15 watts, or to 20 or 50 or 100 watts WILL WORK FINE.   
   >   
   >The wattage of the resistor WILL NOT MAKE A DIFFERENCE:   
   >   
   >1. If everytging else in the speaker is working fine,   
   >    a 10 watts resistor will sound identical to a 7   
   >    watt speaker.   
   >   
   >2. If, in the process of blowing up the 7 watt resistor,   
   >    you blew up something else (which is possible, maybe   
   >    even likely), then replacing the 7 watt with a 10 watt   
   >    will ALSO make the speaker sound identical, becasue   
   >    it's just as broken with a 7 watt resistor as with a   
   >    10 watt.   
   >   
   > > there also some on ebay but I'm not so   
   >> sure about quality. Please give me your opinion.   
   >   
   >My opinion is that you're WAY overthinking this.   
   >   
   >Just buy the damned 10 watt resistors and be done   
   >with it.   
      
      
      There is a remote chance it is a "fusible resistor", I've replaced   
   these things on older TV sets. They are used extensively in the   
   electronics industry, especially where temporary large surge currents   
   are tolerated. If that were the case, you would be required to replace   
   it with a similiar resistor of the same power rating. 0.47 ohms is a   
   popular value for a fusible resistor.   
      They DO have a compartively long time to blow compared to a fuse,   
   since the resistor must heat up to the point where the fusible element   
   breaks. In that respect they would be useful in a speaker, since you   
   could allow large transients, and the resistor would open up before   
   the voice coil would be damaged.   
      They were not meant as a consumer replacable item, since the trauma   
   that caused the resistor to blow usually indicated some circuit   
   problem or gross abuse.   
      My guess is that such a low value of resistance would not have much   
   effect on the audio performance (being swamped out by the voice coil   
   resistance), and might give more credence to its function as a slow   
   fuse.   
      If it is a fusible resistor, it is probably chosen for a specific   
   thermal time constant. It would not be wise to replace it with an   
   ordinary resistor, or fusible one of unknown characteristic.   
      
   Paul G.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)