John East MMSR 1-Pickup 3-Knob 3-Band Vol - Treb/Bass Stack - Mid/Mid Stack



  • Control plate not included

  • The BTB-MMSR 3 Knob, including Mid Sweep, has been designed with characteristics very similar to the original MM Stingray 2 Band EQ, but is not a copy of the original circuit.
  • $230.00 - $245.00
    $230.00 - $245.00

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    Control Configuration

    1. Volume
    2. Treble/Bass Stack
    3. Mid/Mid Stack
    4. Available in Black, Chrome, or Gold Finish


    The BTB-MMSR 3 Knob, including Mid Sweep, has been designed with characteristics very similar to the original MM Stingray® 2 Band EQ, but is not a copy of the original circuit. The original used a single op-amp chip (single amplifier stage in the form of a chip) for both bass and treble circuits, whereas this unit utilises a more modern dual op-amp chip (two amplifiers stages in a chip). The bass and treble are stacked which allows inclusion of a mid sweep, along with original MM style bass and treble on a 3 knob plate. When the mid boost/cut is centred, its effect is neutral and the EQ is purely late 70s MM style.

    This unit is supplied fully wired, including 1 single pot, 2 stacked pots, knobs, jack and battery clip, which may be spliced into an existing battery box, as would be available, in most cases.

    The design of the 2 band EQ in the early Stingray® basses is unusual in that it does not follow the types of topologies around which the majority of equalisers are designed. It would seem that Leo Fender designed it to create a particular sound rather than follow any conventions, such as symmetrical EQ curves. Consequently the figures shown may appear unusual to those familiar with such specifications. In fact it's not easy to portray what this EQ does with a few numbers, but in any case some figures, based around a flat response input signal, are quoted as reference points.

    Please Note:Like the original Bass/Treble EQ, this circuit does not have a flat response when the controls are set midway. This unit is not designed as a clinical tool, where what goes in, comes out at some reference setting. However, the Mid Sweep circuit does have a neutral setting in order to preserve the original feel of the Bass & Treble EQ.

    Technical Specifications

    • Volume

    • Sets the level from the bass and treble section of the preamp feeding the mid section. This means that the pickup feeds the preamp directly, allowing the best possible transfer of signal, and full interraction of the pickup with the preamp. Since the mid section is after the volume control, it feeds the jack directly with a low impedance output.

      Treble/Bass Stack

    • Treble:(+20dB / -16dB @ 10 kHz)

    • The upper knob controls the treble. There is more boost than cut, giving rise the characteristic 'sizzle' associated with the Stingray® style of EQ.

    • Bright:(+6dB @ 7kHz)

    • Pull the Treble knob for the Bright setting.

    • Bass:(+14dB / -7dB @ 40Hz)

    • The lower ring bass control has a little more boost than the original. The boost curve continues to rise towards the lower frequencies, without flattening out at any frequency within the normal bass guitar range. Conversly the cut characteristic is shelving, having an essentially flat response from 30 - 100Hz, when fully cut.

      Mid/Mid Stack

    • Mid Boost/Cut:(+/-12dB)

    • The upper knob sets the amount of Mid boost or cut at frequencies according to the setting of the Frequency knob. The midway indent is the 'flat' setting.

    • Mid Freq:(100Hz - 1kHz or 200Hz - 2kHz)

    • The lower outer ring sets the continuously variable Mid frequencies for boost or cut. DIL switches on the circuit board allow low or high ranges to be set. Both switch sections should be set to ON for the Low Range and both set to OFF for the High Range.

    Question: Where Can I Buy a John East MMSR 1-Pickup 3-Knob 3-Band Vol - Treb/Bass Stack - Mid/Mid Stack?

    Answer: You can buy this from Best Bass Gear by Calling 877-839-3531 or Emailing us at or chatting with our Bass Techs


    Rate and Review this item
    Verified Buyer
    Great Customer Service
    By Jhalb
    I bought the MMSR 1 used. I needed help with the install. John helped me through the install. This was on Saturday my time. Love the preamp and would recommend to anyone looking to upgrade their bass.
    Verified Buyer
    Musicman Stingray
    By Michael
    Quite happy with this purchase.totally changed the tonal options for my 79 2-band eq ray!Luv it!Only one thing and it is probably fault of my own.The pot closest to the quarter inch input keep loosing up,so i removed the knobs and tightened it and i may have over tightened it,think the shaft is stripped!I will try adjusting the shaft height and use lock-tight on the threads
    Verified Buyer
    Director of Lodging
    By Mike
    I purchased the JE pre for my 79 stingray. It installed super easy, bolted right into the factory plate, and sounds great. The bass and treble sound just like the original, only cleaner, and the mid give versitility that the factory pre doesn't have. This is a great preamp. My only gripe is that the volume pot has a really small thread shaft which makes it tough to keep cenetered in the hole on the plate, this is minor though.