(Topic ID: 233098)

Resistor Type


By Swainer80

5 months ago



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  • 9 posts
  • 5 Pinsiders participating
  • Latest reply 5 months ago by Swainer80
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    #1 5 months ago

    I have an open 3 ohm, 5 watt resistor (the blocky white cement type) used for a flash circuit in a Space Station. I blindly ordered a 3 ohm, 5 watt resistor and it is not what was expected (it is the round type and significantly smaller then the original type). I was wondering if there is much difference between the two (they both seem to be wire wound) and if the smaller round resistor is acceptable to use as a replacement. Any thoughts?

    #2 5 months ago
    Quoted from Swainer80:

    I have an open 3 ohm, 5 watt resistor (the blocky white cement type) used for a flash circuit in a Space Station. I blindly ordered a 3 ohm, 5 watt resistor and it is not what was expected (it is the round type and significantly smaller then the original type). I was wondering if there is much difference between the two (they both seem to be wire wound) and if the smaller round resistor is acceptable to use as a replacement. Any thoughts?

    As long as the rating for ohms and watts (power dissipation) are the same, I have no problem substituting one for the other. Mostly the two just are different in construction and price, and there are no critical differences for the application of pinball.

    #3 5 months ago
    Quoted from Swainer80:

    I have an open 3 ohm, 5 watt resistor (the blocky white cement type) used for a flash circuit in a Space Station. I blindly ordered a 3 ohm, 5 watt resistor and it is not what was expected (it is the round type and significantly smaller then the original type). I was wondering if there is much difference between the two (they both seem to be wire wound) and if the smaller round resistor is acceptable to use as a replacement. Any thoughts?

    I would recommend getting the correct "cement" resistor because it's truly a power supply resistor and made to handle higher temperatures.

    #4 5 months ago

    I agree with Turtle if you purchased a 5W "Small form factor" resistor. Problem with these - they are rated 5W but run hotter than hell. A full size resistor will run cooler.

    Do you have the part number for the resistor purchased?

    #5 5 months ago

    Here is a pic of the resistor. The only reason why I considered using it is that I saw that Gottlieb uses a similar resistor type. I just was not sure about the Heat dissipation, that was the only variable that I was unsure of.

    1546659449479581646259 (resized).jpg
    #6 5 months ago

    It will work. For home use it will last at least 10 years if your machine is not on 24/7.

    #7 5 months ago

    That's a metal oxide resistor and is clearly a small form factor 5W resistor (when compared to the size of the fuse).
    In real life - a small form factor 5W resistor is actually a glorified 3W resistor and will run hotter than a true 5W resistor.
    The one redeeming factor is that this is in a flash lamp circuit which doesn't run continuously. This resistor will work but if you need to replace in future - go with full size 5W resistors.

    #8 5 months ago
    Quoted from G-P-E:

    The one redeeming factor is that this is in a flash lamp circuit which doesn't run continuously.

    That's why I said it isn't a problem to sub in this case.

    2 weeks later
    #9 5 months ago

    Thank you all for your input and expertise. Specs are specs and numbers are numbers but why is not clear sometimes. I'm kind of a cheap bastard and would hate to throw it away instead of put it to use. In the future I will replace like for like. Thanks again.

    -Mike

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