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My Project - And I need help...

Discussion in 'Amps [BG]' started by Hobobob74, Jan 17, 2013.


  1. Hobobob74

    Hobobob74

    Joined:
    May 21, 2007
    Location:
    Kalamazoo, MI
    So, probably 5 years ago, I got this little gem of a PA Tube Amp. Its just been sitting in my basement ever since, but I finally might have found something to do with it.

    It only has an old school mic. jack, but i have a converter to switch that to a 1/4" female jack to plug a bass or guitar or whatever into.

    So, I'm thinking I'm gonna build a little wood cab to put it in and make a little head out of it.

    Here is my questions:

    1. The speaker connections are just for the wires. But there is a 8 ohm and 4 ohm screw. So how would I wire up a jack for say, 8 ohm? Ill attach a picture for a better idea, lol.

    2. Can I just disconnect the volume and bass/treble pots, add wire, and put the knobs on the outside of my new 'head cab'.

    Hopefully this turns out cool, lol:bassist:
     

    Attached Files:

  2. Hobobob74

    Hobobob74

    Joined:
    May 21, 2007
    Location:
    Kalamazoo, MI
    some more
     

    Attached Files:

  3. Hobobob74

    Hobobob74

    Joined:
    May 21, 2007
    Location:
    Kalamazoo, MI
    underbelly
     

    Attached Files:

  4. Nate74

    Nate74 Supporting Member

    Joined:
    Mar 3, 2007
    Location:
    South Bay of Los Angeles
    1. The speaker connections are just for the wires. But there is a 8 ohm and 4 ohm screw. So how would I wire up a jack for say, 8 ohm? Ill attach a picture for a better idea, lol.

    Drill a hole, put the female 1/4" jack into it, wire the appropriate wires to it, preferably with solder not masking tape.

    2. Can I just disconnect the volume and bass/treble pots, add wire, and put the knobs on the outside of my new 'head cab'.

    Yes.
     
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  6. dhsierra1

    dhsierra1

    Joined:
    Dec 12, 2009
    Location:
    Central CA Coast
    yup. You'll want your ground wire connected to the "C" screw terminal and the hot (positive) to the 8 ohm screw.

    Looking at that schematic seems like you'll have around maybe 8 or so watts. Go with a high efficiency speaker if you're going to put bass through it.

    Looks like a fun project, good luck and keep us posted :cool:
     
  7. BassmanPaul

    BassmanPaul Gold Supporting Member

    Joined:
    Aug 25, 2007
    Location:
    Toronto Ontario Canada
    Honestly I think you'll find that that amp will not give you a lot of low end. It'll make a better guitar amp.
     
  8. Steve Dallman

    Steve Dallman Supporting Member

    Joined:
    Mar 5, 2006
    Location:
    East Central Wisconsin
    It's not far from the design of a Champ. It could be wired to be a little more bass friendly, but you've got low plate voltage, limited B+ filtering, and about 5 watts. It could be made into a better guitar amp, but it would still be just a few watts. It has a pretty small output transformer to boot. You could put in a SS rectifier to get the voltage up some, and that would allow you to increase the B+ cap, which would aid a little in headroom.
     
  9. Hobobob74

    Hobobob74

    Joined:
    May 21, 2007
    Location:
    Kalamazoo, MI
    Yeah, I would probably just use it for a practice guitar amp.

    But I've heard that it would make a good harp amp too
     
  10. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    Nice little cathode bias Class A amp. Use shielded wire to extend the wire on the pots, old balanced mike cable will do.
     

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