Darkglass Microtubes B3K 2.0 Bass Distortion

by Darkglass Electronics

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  • Darkglass Microtubes B3K 2.0 Bass Distortion

    The newest Microtubes B3K revision features great upgrades! Same tone, more reliability, and made in Helsinki, Finland.

    The B3K delivers an immense amount of sounds, from warm, clear, and punchy tube-like Overdrives, to devastating Raging Bass Distortions, all without losing a gram of low end or definition! Doesn’t matter if you play pop, rock or metal. This is the Bass Distortion you’ve been always waiting for.

    “This is an elegantly designed and pleasingly small pedal with a big overdrive sound, interesting parameters, and the essential blend knob. Highly recommended.”
    - Justin Meldal-Johnsen, Nine Inch Nails/Beck

    “I’m completely blown away with the B3K. For such a small pedal with 3 knobs, it produces a ridiculously massive sound! It has been a great tool for me to have in the studio, there is such a variety of tones you can achieve with it. Even when you drive it hard, the low end is still amazingly clear, which is exactly what I need!”



    1) relay bypass for ultra transparent buffer bypass (same as currently used in B7k’s and VMt Deluxe): We decided to replace the relay merely for reliability reasons. The relay worked great most of the times, but it wasn’t completely silent and also all the failures we’ve had in the past have been in pedals using this system. We’ve replaced it with a smooth JFET switching using the same buffers that the B7K and Vintage Deluxe already use. I also replaced the foot switch for an on board tact switch with a spring actuator: The result is the same transparent switching, but with increased reliability and robustness. Specially considering that the switch we’ll implement now is rated for 1 million cycles (yes, 1 million!).

    This change is a bit more costly to us (specially because mounting the tact switch is more time consuming) but we believe the increased reliability is more than worth it, repairing pedals is not the most fun of tasks so anything we can do to reduce the amount of failures in the long term is a good move in our opinion.

    2) attack switch: We also took this revamp to implement an upgrade that was long overdue, removing one of the Boost options (“Boost 2”) adding a “Cut” position for the Attack switch! This adds a whole new dimension when it comes to the B3K and it’s versatility! Now users can leave the Attack (treble) Flat or Boost it, but also tame it down, which makes it a great addition when playing with already bright rigs, new strings and cabinets with tweeters.

    Darkglass Microtubes B3K 2.0 Bass Distortion Features:

    • Level: Controls the level of the Overdriven Signal.
    • Blend: Allows to mix exactly how much clean signal you want to mix with the Overdriven.
    • Drive: Sets the amount of gain for this pedal.
    • Grunt Switch: Choose between 3 different Bass boost levels before the gain stages. This interacts with the Drive knob, so you can choose how much of bass you want to saturate
    • Attack Switch: This switch features the same “Ultra Hi” option in most tube bass amps. And it allows you to choose how much treble content you want to saturate. The Boost setting gives more clarity, presence and definition. The Off option will round up your sound, making it a bit warmer and less sharp.
    • For ecological reasons, non of our products will ever again include battery snaps! The B3K can be powered with a regulated 9V power supply (center negative). You can also experiment with 12V power supply for extra headroom.
    • Original Design featuring Hybrid JFET and CMOS gain stages for a natural dynamic response.
  • We want you to feel confident with your Prymaxe purchase, which is why when you purchase a new or demo (like new/gently used) product from us, you are automatically enrolled into our FREE Two Year Warranty.* 


    What is covered:

    • Brand new (non-clearance) and demo (like new, gently used) products that have been purchased within the last two years
    • Products that malfunction under normal use
    • Cost of repairs


    What is NOT covered:

    • Used (non-demo), vintage, and clearance products
    • Products purchased more than two years ago
    • Cost of shipping both ways
    • Items with clear signs of abuse (up to Prymaxe’s discretion)


    * We reserve the right to end this promotion at any time.


  • When you place an order at Prymaxe, you can rest assured that your item will be carefully packaged. Our shipping team is dedicated to making sure your item arrives in perfect condition and on time.

    All in stock orders placed before 2pm EST will ship same day and all orders placed after the cutoff will ship the next business day*. If you need an order immediately, please let us know and we’ll try our best to accommodate your request.

    * Our same day shipping policy may be temporarily suspended during a sale or if you pay with Affirm. Rest assured, we will do everything we can to get your order out as quickly as possible. Please call us at 1-855-PRYMAXE if you are placing an overnight order and need it to go out immediately.


    Domestic Shipping
    Most orders shipping within the US will ship via USPS or FedEx and are fully insured, we also offer express options if you need an item within 24 hours. All tracking numbers will be sent via email after the item is shipped. If you did not receive your tracking number please feel free to call or email us. 

    All US Orders Ship for FREE

    International Shipping
    We love and truly appreciate all of our International customers. All of our international shipments are fully insured and are guaranteed to be delivered or your money back. We offer a variety of shipping options for you to choose from and if for any reason there is an issue with your order we will make it right, that is our promise you. 

    Pre-Order Shipping: 

    Pre-Orders typically ship with 2 weeks. In the event a product is backordered we will contact you with an exact shipping timeframe. 

    Smaller items will ship USPS First Class. 

    USA shipping only for Vox, Korg, Voodoo Lab, MXR, Dunlop, Way Huge, Barber Electronics, Music Man, Tech 21, Fender, Marshall, PreSonus, Source Audio, and Strymon.

  • If you would like to return an item, please use the return widget at the bottom of this page to look up your order and start the return process. If you need assistance, or if the widget is not working for you, please email us at sales@prymaxe.com with our order number and reason for return.

    45-Day Satisfaction Guarantee

    If you are not 100% satisfied with your purchase, you can return it within 45 days of the original purchase date for a full refund. If an item is not received by us within the 45-day window, the package will be refused. All new items returned must be in BRAND NEW condition with zero signs of wear or use and must be returned in the original packaging with ALL materials (free/bundled items -- must be unused/unopened, warranty cards, plastic, pouches, manuals etc.). Demo (Like New/Gently Used) items must come back in the same condition they were sent to you, with all included materials, if applicable.

    Our 45-Day Satisfaction Guarantee covers brand new and demo (like new/gently used) products only -- it does not cover used and clearance products (see below). It also does not cover items in the “What is NOT Returnable” list below. Please note: All actual shipping fees paid by Prymaxe will be deducted from your refund. This includes orders that qualified for free or subsidized shipping. Return shipping must be paid by the buyer. If you received a defective or incorrect item, please see our FAQ section below.  


    * Prymaxe reserves the right to define abuse of the return policy on a case by case basis and consequently refuse subsequent return requests by said abuser and place them "All Sales Final".


    Used and Vintage: 

    All Used and Vintage items come with a 48 hour approval period. Please contact us directly at sales@prymaxe.com within 48 hours of receiving your product for us to set up a manual return for you. Be sure to include your order number and reason for return in the email. All Used/Vintage items must be returned in the same condition they were sent to you in, as well as include all materials that came with it.

    What is NOT Returnable:

    • Accessories (this includes all pickups, strings, picks, pedalboards, tuners, expression/volume pedals, etc.)
      • However, if you received accessories with the product as part of a bundle, the accessories must be returned with the product, and they must be unused and unopened
    • Clearance Items (Clearance items are clearly marked with "CLEARANCE" in the title)
    • Special/Custom Orders

    Return Instructions:

    All returns should be insured by the buyer and sent via UPS, Fedex, or USPS with tracking. Please do not write on or attach tape or labels to the product box -- use a packing box to return the product. Attach a shipping label with the RA number onto the shipping box.



    When will I get my refund?

    Once your return is received by us, your refund will typically be processed within three business days. It typically takes a few business days for all credit card refunds to be processed and reflected on your statement. This means it will take a few extra days for your refund to show in your account after your return is processed. Please note: All actual shipping fees paid by Prymaxe will be deducted from your refund. This includes orders that qualified for free or subsidized shipping. Return shipping must be paid by the buyer. If you received a defective or incorrect item, please see the next question.  

    What if I receive a defective or incorrect item?

    If a product is defective upon arrival, or the wrong item was received, we will send you a replacement/the correct item, and all the shipping fees will be covered by us. For defective items, Prymaxe reserves the right to refuse the return if we determine the reason for the unit failing was not covered under the warranty (i.e., if the item was damaged due to user fault or error). If you feel your item was damaged in shipping, please take plenty of pictures of the damaged box and item and immediately contact us so we can open a claim with the shipping company.

    Please be very diligent with testing your defective item. Be sure to try other guitars, power supplies, cables, and amps. We also request that you take a video of the item not working. If we receive your item, test it, and find it to be working, we will give you a refund minus the cost of shipping both ways.

    When will I get my replacement item?

    If a defective or incorrect item was sent to you, we will send out the replacement as soon as we get the defective/incorrect item back and approve/process the return (typically within three business days). If we do not have the replacement in stock, we will issue a full refund. If you need the replacement to be sent out immediately, please place a new order, and when we get the defective/incorrect item back, we will issue a full refund of the original order.

    When must I ship my return?

    Your return must be received by us within 45 days of the original purchase date. This means you must ship your return with enough time for us to receive the package within 45 day deadline. If it does not arrive within 45 days, we will refuse the package. If you feel you sent the package within a reasonable time frame, but it arrived late due to the shipping company’s error, please immediately contact us to make an appeal before we refuse the package.

    What if I pre-ordered an item?

    Even if you pre-ordered an item, we must still receive it within 45 days of your order date in order to give you a refund, so please only pre-order items you plan to keep. If your pre-ordered item arrives defective, you will have a 48 hour period to contact us for a replacement.

    Why was my package refused?

    There are a number of reasons your package could be refused by us, including:

    • It was a new/demo item received outside of the 45-day window
    • It was a clearance, accessory, or other non-returnable item
    • The package is missing items that were included in the original shipment
    • The item shows signs of wear
    • The original product box was damaged or written on/the item was not packaged in a separate shipping box

    Why is the widget not letting me return my item?

    If you have a valid reason for returning/exchanging a product that is within our return policy, but the widget will not let you start the return process, please contact us directly at sales@prymaxe.com with your order number and reason for return.

    Returns Widget

    Use the widget below to look up your order.

    If your order is not found, please make sure you added the number sign (#) in front of it.

    If your order is still not found, please email us at sales@prymaxe.com with your order number and reason for returning so we can create a manual return for you.

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