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tube amp taps / ohms / cabs quesion

Discussion in 'Amps and Cabs [BG]' started by yodedude2, Dec 24, 2016.


  1. yodedude2

    yodedude2 Supporting Member

    Nov 19, 2005
    san antonio, texas
    hi y'all, i have a fender pa 100 tube head. it is rated at 100 watts at 4 ohms. it has two speaker outputs, each labeled 8 ohms. i have used one and two 8 ohm cabs with this amp with no issues. question:

    how would i hook up a single 4 ohm cab to this head? should i use a parallel speaker cable? should i have the amp rewired for a 4 ohm speaker output (if the transformer permits)? or am i missing something obviously simple?
     
  2. To use a single 4Ω cabinet just plug it in. Two 8Ω cabinets will also be a 4Ω load. Using one 8Ω load is not ideal but I doubt you’ll have any problems. Tube amps are forgiving. :)

    Make sure you plug into the Speaker socket when using a single cabinet.
     
    Sartori and yodedude2 like this.
  3. yodedude2

    yodedude2 Supporting Member

    Nov 19, 2005
    san antonio, texas
    thanks. tube amps can go lower ohms than rated, but must have a cab (load)...s/s can go higher ohms than rated, and can go without a cab...generally speaking...as i recall. just checking. thanks again!
     
    Last edited: Dec 24, 2016
  4. If by zero you mean open circuit then you are correct. If you mean a short circuit then you are very wrong.
     
    yodedude2 likes this.
  5. yodedude2

    yodedude2 Supporting Member

    Nov 19, 2005
    san antonio, texas
    good point. i edited my post.
     
    BassmanPaul likes this.

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