Just a question that I may already have answered myself

Discussion in 'Glowing Bottle Tube Amp Forum' started by stepvan, May 15, 2021.

  1. stepvan

    stepvan Tele-Afflicted Silver Supporter

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    so this is the question,

    I have a 1/4" male to female stereo cable that I want to use as a extension cable from one of my amp heads to the speaker cabinet and want to know for sure that the stereo cable to mono jacks are not going to cause damage to the amp heads. The speaker impedence is correct so its a Matter of knowing for sure the stereo cable will be compatible between the head and actual cabinet its self assuming it has mono input jacks

    Thanks
     
  2. ScottJPatrick

    ScottJPatrick Friend of Leo's

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    Not sure that a normal male to female stereo lead would be suitable as a speaker cable, is it an actual speaker lead because if not you could run into trouble.
     
  3. MuddyWolf

    MuddyWolf Tele-Meister

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    Dont do it. Its probably a shielded cable of some sort. Kablueeee! Only use a non sheilded, mono, heavy gauge speaker cable to connect the power output of any amp to ANYTHING. PERIOD.

    Your on your own now.
     
  4. Mowgli

    Mowgli Tele-Meister

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    Question: Is that cable designed for speakers or is it a cable appropriate for connecting, say, a headphones output to headphones?

    Speaker cables use thicker wires in order to handle greater current. Aside from the shielding and coaxial designs, that's why there's another significant difference between guitar cables and speaker cables and why guitar cables should never be used for speaker cables. Some cables aren't meant for significant power transfer.

    Placing a cable that can't handle the power transfer from the power amp to the speaker may be asking for trouble for your amp.

    If it's a combo amp, the power transfer from the OT to the internal speaker occurs over a relatively short distance. Really thick cable wires aren't necessary but they can't be too thin.

    But if the length from the output transformer to the speaker is sufficiently long then the cable wires have to be thicker. Otherwise they could heat up increasing the resistance (& total impedance) or, worse, burn and create an open circuit.

    So don't put your output transformer at risk by not using an appropriate speaker cable.
     
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  5. kennl

    kennl Tele-Afflicted

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    a STEREO cable will have a TRS 1/4" male plug and 2x1/4" female jacks - will not work in your application
    a "Y" cable is what you need : 1/4" male to 2 x 1/4" male
    You can use a factory speaker cable, cut it in half, and solder both bare ends together into a Switchcraft 184L plug - be careful to match tips to tip and sleeves to sleeve

    [​IMG]


    than configuration will provide a PARALLEL connection to the speakers, so 2 8-ohm cabinets will present a 4-ohm load to the amp head
     
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  6. Dukex

    Dukex Tele-Afflicted

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    No, you can't do it.

    Use unshielded speaker cable.
     
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  7. stepvan

    stepvan Tele-Afflicted Silver Supporter

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    Not sure that is why I am asking
     
  8. stepvan

    stepvan Tele-Afflicted Silver Supporter

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    I will have to verify if it is a speaker cable or guitar.
     
  9. mfguitar

    mfguitar Tele-Afflicted Silver Supporter

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    Why risk it? It may work but if you are running high power you risk damage, just buy the right cable.
     
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  10. ScottJPatrick

    ScottJPatrick Friend of Leo's

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    110v lamp cable makes good speaker lead, best not to use your stereo lead if you're at all unsure, buy some cable and a couple of mono jacks so you can make it the length you need. Otherwise just buy a speaker lead, they're not expensive and much cheaper than a blown transformer!
     
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  11. King Fan

    King Fan Poster Extraordinaire Ad Free Member

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    Just right. Lamp cord (zip cord) by the foot is dead cheap; a male plug is bog standard; a nice 1/4 female connector is the Switchcraft 128.



    upload_2021-5-16_9-25-47.png upload_2021-5-16_9-26-35.png
     
  12. Mike_LA

    Mike_LA Tele-Afflicted

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    Um, the amp will only have the contacts to connect to 1 side of the stereo plug so it will work.
    If you are not running at the max volume of the amp it will work.
    If you are maxing out the output of the amp a proper non shielded heavier cable is best.
     
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  13. Paul G.

    Paul G. Friend of Leo's

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    I'm 100% sure it is not a speaker cable. If you don't believe everybody here, unscrew the connector at one end. You will see 2 thin wires plus a braided shield. This is not what you want. The ground is connected to the shield which has capacitance and will damage your amp if you pass a lot of current through (play it loud).

    Speaker cable is unshielded and the sheath will be filled by 2 heavy (16 gauge or larger) wires.
     
  14. DrPepper

    DrPepper Friend of Leo's

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    Long speaker cables between amp and speaker tames some amps a bit... make certain of current capacity or damage could occur.

    1/4" unbalanced TS (tip/sleeve) male/female plug/jack...
     
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