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For Sale - SWR Mo' Bass Amp Head

Discussion in 'For Sale: Amps, Preamps, and Cabinets' started by emjay, May 3, 2012.

  1. emjay

    emjay Supporting Member

    The head is in excellent working order. It has minor rack rash, some scrapes on knobs, and is missing a couple of screws on top, but that's about all the wear and tear I can report. Price - $750 including the effects bypass foot switch, if you can pick it up in Juno Beach FL; otherwise, for $800 I'll FedEx it to you anywhere in CONUS.

    Note - this amp is not the Mini-Mo' preamp

    Sorry - I don't have actual photos to post and the head is on consignment at a music shop 1/2 hour away, so I can't easily take any; but the description is accurate. For those that don't know what this head looks like though, I'm including a stock SWR photo.

    Although this comes with a standard Chinese 12AX7/7025 tube, I have many wonderful fully-tested vintage English, German and Dutch replacement 12AX7/ECC83 NOS tubes for sale from $60 - $160 additional; if you want to upgrade it. There are subtle tonal differences with these tubes in this head, particularly in the details of the built-in effects; and well worth their price IMO.

    For those who are unfamiliar with this amp, here's excerpts from SWR's manual, which describes it head very well:

    Possibly the only multi-effects unit tailored for bass, incorporating all studio-quality ANALOG modules. The Tube Overdrive is not of this earth. The Octave Effect (he called it a "SubWave") tracks notes in registers so low it seemed

    impossible. The EQ circuit is a thing of beauty, and the Chorus simply sings. By the time you hear the Synth pumping out sounds straight off of Stevie Wonder's "Songs In The Key Of Life" album, you know you love this head.

    Now you can own a single amplifier that can be as simple or complex as you need it to be. Run it totally clean into one speaker cabinet for classic SWR sound. Run it into two cabinets and use the chorus. Split your clean and dirty

    signals using the Dual Mode feature. Combine effects. Switch back and forth. Experiment to your heart's content. Use it in the studio with everything on at once for sounds never before recorded. Send one signal to a mixing board. Send

    two. Send three!

    • Dual independent input jacks compatible with both passive and active instruments
    • Pre-Amp Volume Control with bi-color (green/red) LED peak clipping indicator
    • Variable Limiter/Leveler Control with yellow LED indicator
    • Aural Enhancer Control
    • Treble Level Control
    • Midrange Level Control
    • Midrange Frequency Control
    • Bass Level Control
    • Overdrive "Drive" Control
    • Overdrive Level Control
    • Subwave Tone Control
    • Subwave Mix Control
    • Bassynth Filter Control
    • Bassynth Resonance Control
    • Bassynth Envelope Control
    • Bassynth Mix Control
    • Mo' EQ Treble Control
    • Mo' EQ Midrange Control
    • Mo' EQ Bass Control
    • Chorus Depth Control
    • Chorus Rate Control
    • Push switches and unique-colored LED indicators for on/off control of all effects
    • Internal Effects Bypass Switch with LED indicator
    • Left and Right External Effects Blend Controls
    • Dual Mode Switch with LED indicator
    • Left and Right Master Volume Controls
    • Illuminated Neon Power On/Off Switch
    • Stereo Headphones Jack
    • Screwholes for Rack Mounting (on chassis in each corner)


    • Direct Out 1/4" jack
    • Tuner Out 1/4" jack
    • Mo' Bass Out 1/4" jack
    • Direct Out XLR jack
    • Mo' Bass Out XLR jack
    • Line/Direct Switch for 1/4" and XLR Direct Out Jacks
    • Individual 3-position Pad Switches (0 dB, -10 dB, -20 dB) for both Direct Out and Mo' Bass Out XLR jacks
    • Ground/Lift Switch for both Direct Out and Mo' Bass Out XLR jacks
    • Stereo Effects Loop (Left and Right Send and Return 1/4" jacks)
    • Internal Effects Bypass Footswitch jack
    • Filter Sweep Pedal jack
    • "Mo' Control" Footswitch jack (shown as "Ft. Sw. In")
    • MIDI Out jack
    • Stereo/Mono Power Amp Assign Switch
    • Two 1/4" and One Speakon Left Speaker Output jacks
    • Two 1/4" and One Speakon Right Speaker Output jacks
    • One Speakon Bridged/Mono Output jack
    • Two Speaker Fuses (3AG, 10 amp fast-blo)
    • One Line Fuse (3AG, 10 amp slow-blo)
    • AC Power Cord Receptacle

    All measurements were taken with a line voltage of 120VAC.
    All noise specifications are "unweighted."
    All voltages and watts are "RMS."
    All measurements taken with tone controls set flat, Aural Enhancer at minimum, all effects disengaged.
    Power Ratings (minimum)
    Bridge/Mono Mode
    900 Watts @ 4 Ohms
    650 Watts @ 8 Ohms
    440 Watts @ 16 Ohms
    (minimum load = 4 Ohms)
    Stereo Mode (per side)
    600 watts @ 2 Ohms
    400 watts @ 4 Ohms
    250 watts @ 8 Ohms
    150 watts @ 16 Ohms
    (minimum load = 2 Ohms)
    Frequency Response (Power Amplifier):
    -3 dB @ 10Hz to 40kHz
    Sensitivity (full output under clipping, 8 ohm load, 100 Hz)
    Passive Input Jack: 42 millivolts
    Active Input Jack: 84 millivolts
    Power Amplifier (Effects Return Jack "in"): 6 volts peak-to-peak
    Input Impedance
    Passive/Active Input: 1 Meg Ohms
    Active Input: 47K Ohms
    Effects Returns: 27K Ohms
    Output Impedance
    Effects Sends: 220 Ohms
    Tuner Output: 220 Ohms
    XLR Balanced Out: 750 Ohms
    Signal To Noise Ratio:
    -88 dB (<10 millivolts typical)
    Equivalent Input Noise:
    15 nanovolts per root/hertz
    Dimensions (measured from the rack ears back)
    19" W x 5 " H x 13" D (the front panel flanges add 1")
    Weight: 29 lbs.

    Attached Files:

  2. mbelue


    Dec 11, 2010
    Bump for one of the coolest heads ever. These are always for sale when I'm strapped. :(
  3. emjay

    emjay Supporting Member

    Still for sale 05/22/12. Any close offers?
  4. trbostic

    trbostic Supporting Member

    Jun 20, 2011
    Columbia, SC
    Any interest in Eden - WT 800c?
  5. emjay

    emjay Supporting Member

    Sorry man, I need the cash!
  6. sixxelachacon


    Sep 24, 2012
    Hey! you still got this baby on sale? what kind of footswitch is it? the multiple one ore the single one?
  7. emjay

    emjay Supporting Member

    Yes, it's still for sale. Like I said in the OP, it comes with the effects bypass foot switch only. I would really like to make this sale, so I'll knock $100 off the price; so $650 cash and carry, or $700 shipped anywhere in CONUS.
  8. patstar777


    Feb 23, 2012
    I know this is the wrong place and I apologize in advance. How do you place an ad here?
  9. emjay

    emjay Supporting Member

    Just start a new thread in the appropriate category under classifieds. You need to be a paying member to post things here though.
  10. Do you still have the SWR MOBASS?
  11. I'm looking for a MOBASS or SM8900 can you contact me :bassist:at 828-230-6168 River
  12. moe.moe

    moe.moe Supporting Member

    Jun 22, 2008
    emjay you have a PM bro...
  13. emjay

    emjay Supporting Member

    Moe - I just PM'd you back....
  14. MaddAnthony_59

    MaddAnthony_59 Supporting Member

    Dec 16, 2006
    Columbus, IN
    I Channel Surf During Commercials. (Drives my Wife CRAZY!!!)
    Bump for the KING of all Bass Heads!
  15. DevinWard369

    DevinWard369 Supporting Member

    Apr 30, 2012
    Still available???
  16. emjay

    emjay Supporting Member

    This amp is pending sale as of 02/01/13. Please PM me if you are interested in being contacted, if the deal falls through.
  17. DevinWard369

    DevinWard369 Supporting Member

    Apr 30, 2012
    Payment sent, item received, im the new SWR MO'bass owner!!!! Thank you I couldn't be happier.