using a DI box with amplifier

Discussion in 'Microphones (live or studio)' started by Drewidian, Dec 16, 2008.

  1. Drewidian

    Drewidian Guest

    well, I have a 120W tube guitar amp head with no speaker cab yet. I also possess a decent Rolls DI box with attenuation adjuster.

    is there a way I can run a signal from the amp through the DI without damaging the amplifier?
  2. Greener

    Greener Guest

    Yes. I really doubt melting the DI will damage the amp.

    Is there a line out from the amp? Do not connect a speaker out to anything other than a speaker.

    Also, if the amp has a line out, why would you need to connect this to a DI? The DI is for instrument level conversion to line level.
  3. Drewidian

    Drewidian Guest

    yes there is a lineout, but I'm under the impression that a tube amp must not be turned on unless it is connected to an appropriate load source (or speakers)
  4. Greener

    Greener Guest

    I have no experience but I would say that getting a decent cab and a mic and an interface will give you so much better results that discussing this is moot.
  5. Boswell

    Boswell Moderator Distinguished Member

    Apr 19, 2006
    Home Page:
    The general advice is not to run a valve (tube) amp without a load. If you can get hold of a 100W 8 Ohm resistor, use that as a dummy load. I made my own 1000W load using the element wire from an old 2-bar electric fire, but don't try this unless you know exactly what you are doing.

    If you use a dummy load, you can safely tap off the speaker output, put it through a 100:1 voltage divider and then into a transformer-type (isolating) DI box into a mic channel of your interface.
  6. Drewidian

    Drewidian Guest

    thanks for your responses. I'm gonna stick with my original plan of 'no action until cabinet'....
    shoulda known better anyway!

    well, I'll update when it has a nice box to sit on....I'm thinking Randall, def. not Bugera
  7. Greener

    Greener Guest

    *drools all over Randall*
  8. Kapt.Krunch

    Kapt.Krunch Well-Known Member

    Nov 21, 2005
    Good choice. Don't run a tube amp with no load. Don't connect anything other than a speaker or an appropriately designed load to the speaker output.

    Bugera=Behringer. If you love the quality, reliability and customer service of Behringer...then Bugera is for you. :roll: (Sarcasm intended!)

  9. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Feb 23, 2005
    A very viable alternative for you is the THD HotPlate. It was designed for the exact application you have described you need. It is basically a cool version of the device that Boswell so eloquently described.
    THD makes very good gear, not cheap, but you get what you pay for.
    Something to consider.
  10. Codemonkey

    Codemonkey Well-Known Member

    Dec 11, 2007
    Scotland, UK
    Whoa, dude... I learn something new every day.

    "(Sarcasm intended!)"

    What sarcasm :S
  11. RemyRAD

    RemyRAD Member

    Sep 26, 2005
    So go purchase yourself a Radio Shaft 8 ohm 5 W resistor. Put it in series with a 60 W light bulb and connect it to your amplifier output. You'll know the smell if you should overload the resistor too you'll know when to turn it down.

    Why not just go to your local music store to see if you can find a speaker with a hole in the cone paper? That shouldn't be too hard? Or get yourself one of those little four-inch speakers that can handle 50+ watts? You'll get the proper load and you'll probably get quite a recordable sound. You might even want to get a wooden box and make a plywood wooden separator. Cut the box in two & place the speaker in the separator. Seal the box up with a microphone inside one end. Presto! A recording box that won't wake the dead.

    Otherwise you might want to try software emulation? And leave the real imagination to the adults?
    Ms. Remy Ann David
  12. BobRogers

    BobRogers Well-Known Member

    Apr 4, 2006
    Blacksburg, VA
    To paraphrase an old saying (I think by R. Crumb) - "recording and electronics knowledge will get you through times with no money better than money will get you through times with no electronics or recording knowledge." I didn't agree with the old saying, But even though my version is better, you are better off with a little money if you have (only) a little electronic and recording knowledge.....

    ... Buy a hotplate.
  13. RemyRAD

    RemyRAD Member

    Sep 26, 2005
    Robert Crumb plays a mean banjo. While being my favorite cartoonist. So keep on tracking! I love Mr. natural I think he's sexy too. Robert doesn't like it but I'm glad I have my copy of Fritz the Cat on DVD. Ralph Bakshi is my favorite animation cartoonist. I mean whatever happened to the sequel? Fritz II Bad?

    I think my kitty knows Fritz?
    Ms. Remy Ann David

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