New fuse for Astron 35?

Discussion in 'General Technical Questions and Answers' started by KM6LYW, Dec 21, 2018.

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  1. W9WQA

    W9WQA Ham Member QRZ Page

    found them!, .5 amp and 5 amp,250 volt.
    i guess i stuck them to do a check out and never used them, until the radio test.
    they measure1.4 and .7 ohm.
    they will glow with a short on 12 v.
     
  2. WA9SVD

    WA9SVD Ham Member QRZ Page


    That's not quite. Would a piece of 30 AWG wire carry the same amount as a piece of 12 AWG wire?:confused: Fuse wire is determined not just bt resistance, but on the amount of current it most safely carry.
     
  3. W9WQA

    W9WQA Ham Member QRZ Page

    but on the amount of current it most safely carry

    hmmm?

    oh,oh I just found a agc "10" amp in my Astron, now my house might burn down...
    and its 32 volt...
     
    Last edited: Jun 11, 2019
  4. KA9JLM

    KA9JLM Ham Member QRZ Page

    Are you sure those are not lightbulbs ?

    I have some of those. They look just like a 3AG fuse.

    They are great to play tricks on technicians in a lab.

    Almost as fun as putting buss wire on a solder spool.
     
  5. W9WQA

    W9WQA Ham Member QRZ Page

    the serious point is that line volt fuses cant be used in low volt circuits...
     
    WA9SVD likes this.
  6. WA9SVD

    WA9SVD Ham Member QRZ Page


    NO, it is the CURRENT flowing through the fuse that causes it to blow.
     
  7. W9WQA

    W9WQA Ham Member QRZ Page

    p= i x r
    if i is 500 amps and r is zero then power dissipated is zero huh, no heat
     
  8. WR2E

    WR2E Ham Member QRZ Page

    almost...

    I^2 x R

    I SQUARED R

    Can't believe "Why or How Fuses Blow" is going on this long.
     
  9. W9WQA

    W9WQA Ham Member QRZ Page

    oops, i knew that, brain??

    oh time check, its 5.50 pm chi time
     
  10. WR2E

    WR2E Ham Member QRZ Page

    If the source supply voltage didn't 'fold back' due to overload, they should work OK. Yeah, if you have a 12V supply that folds back with a short, then all bets are off.

    Once the supply folds back it can no longer pump the current needed to clear the fuse.

    Still, best to use a fuse rated for the service it's used in!
     
    Last edited: Jun 13, 2019

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