Nfb 4k7.....

Discussion in 'The Workbench' started by Mark Simon Hell, Mar 12, 2014.

  1. Mark Simon Hell

    Mark Simon Hell New Member

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    I saw that in the last 10 years Plexi use a 4k7 in the NFL.. instead of 100k or 47k as the old schematics... why?
     
  2. john l

    john l Well-Known Member

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    That's not right.
     
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  3. Mark Simon Hell

    Mark Simon Hell New Member

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    ??
     
  4. bulldozer1984

    bulldozer1984 Everybody's Favorite Member VIP Member

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    the amp would not operate correctly with that much negative feedback. 27k is the lowest value i have seen used there.
     
  5. matttornado

    matttornado Well-Known Member

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    4k7 is another way of saying 47K
     
  6. Mark Simon Hell

    Mark Simon Hell New Member

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    ..no... 47k are 47000 ohm, 4k7 are 4700 ohm.....
     
  7. damienbeale

    damienbeale Well-Known Member

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    Oxford ish sorta...
    :hmm:Nope. It's 4.7k
    Standard nomenclature for suppliers.
     
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  8. Mark Simon Hell

    Mark Simon Hell New Member

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    yellow-pourple-red.... (no orange)
     
  9. damienbeale

    damienbeale Well-Known Member

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    Must be a dark orange. Take it out and measure it.
     
  10. john l

    john l Well-Known Member

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    Sorry mark there was more to my post that didn't make the boat. I was sick as a dog and pretty delirious lol. I think if you checked again you'd find that it's 47k not 4K7. Sorry for the vague reply.
     
  11. mickeydg5

    mickeydg5 Well-Known Member

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    I think the more appropriate followup question would be where did you encounter or discover this information?

    More to the point, where is this 4.7k or 4k7 located?
     
  12. Mark Simon Hell

    Mark Simon Hell New Member

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    is located between a presence pot and ohm selector.... purple wire...
     
  13. mickeydg5

    mickeydg5 Well-Known Member

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    Well that verifies its location.

    Can you show us a picture?
    Like Damien mentioned, hopefully the resistor is discolored and is a 47k value. Can you measure its resistance?

    If someone did swap it out, then replace it with a nice 47k or 100k. :D
     
  14. jgab

    jgab Active Member

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    The 4.7K resistor wired on the presence pot connecting the right lug of the pot to the ground buss is not a NFB resistor. I am sure the NFB resistors wired on the circuit board will be somewhere between 47K-100K.
    Can you link us to this schematic you saw?
    I think you just misread this schematic you are referencing...
     

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