Pentode Mk2 Colour Module

Question? Check the FAQ.

Tone Sculpting Tube Gigantifier
for Chroma, Mister Focus, & DIYRE Colour



There something so visceral and satisfying about listening to audio reproduced by a tube circuit. Pentode Mk2 increases the perceived loudness of your source by saturating the transients (audio sorcery!).  As the ratio of RMS to peak energy grows by turning up the Colour host's Drive knob, sonic density is magnified, volume is increased, and the sound becomes gigantic. That's why we like to call Pentode a Gigantifier!  Three-dimensional depth, rich midrange, and low end girth - it's all there by pressing a single button.  No starved plates here.  This NOS subminiature tube is running near its max plate voltage courtesy of a dedicated 32V high voltage supply. If you were a fan of the original Pentode, you will love the updated version.

Pentode Mk2 intensifies vibrant color in the source by adding musical 2nd and 3rd order harmonic distortion.  Expanding on the design of the original Pentode Colour, the user may now select between one of two tube bias settings to fine-tune the harmonic spectra.  The RICH setting presents a lively blend of both even and odd order harmonics, which enhances presence and pulls the sound forward in a mix.  This setting configures the tube to deliver the original Pentode tone many have grown to love, especially on guitars and vocals.  A new FAT bias setting configures the tube for mostly 2nd order harmonics.  The sound is deep, thick, pure, round....and fat!  It evokes a more vintage vibe that some may associate with classic tube equipment using triodes.

You can further sculpt the sound and sonic texture with the new 2-band Baxandall EQ, which follows the tube stage.  The elegant simplicity of this circuit has attracted hi-fi and pro audio designers since its invention in 1952.  Revolutionary for its time, it still remains a classic due to its effortless tone bending powers.  In our implementation, the Bass and Treble curves, and their unique interaction were inspired by an obscure 1960's tube mixer.  We tweaked by ear for optimum musical synergy with the rest of the circuit.  Whether you set it up to add a signature frequency contour to the tube saturation, or employ it as a variable Bass or Treble EQ (in Chroma or Mister Focus), this Baxandall EQ surely makes Pentode Mk2 one of the most potent Colour modules we offer.


  1. Unity gain signal path with output trim, pre-trimmed at the Rogue Planet Command factory
  2. NOS Raytheon 6418 subminiature tube
    1. Two bias settings (via jumper): Rich and Fat
  3. Regulated DC filament supply
  4. 2-band Baxandall EQ inspired by vintage 1960's tube mixer
    1. Bass and Treble bands individually bypassable via jumper
    2. EQ gain adjustable via trimpots: +/-8 dB
    3. Recommended applications: subtle tube frequency contouring, bus sweetening, mix-ready vocal and guitar presence, big bass
  5. Class A biased buffers using audiophile grade op amps
  6. Wima MKP film caps
  7. Analog plugin compatible with Chroma and Mister Focus
    1. C-DRV knob on Chroma controls amount of drive into tube
    2. C-MIX knob on Chroma blends effected signal with dry signal
    3. If Treble or Bass EQ is enabled C-MIX knob will control the amount of boost/cut applied
  8. Compatible with DIYRE Colour

Fully assembled, calibrated, and tested by Louder Than Liftoff.

Chroma, Mister Focus, or DIYRE Colour Palette must be purchased separately.

Note: There is a real vacuum tube in this thing. One thing that real tubes have that emulations don't is microphonics. Due to the vibration sensitive nature of the 6418 tube, some units may experience a low-level ringing for a few seconds when the unit is bumped or the front panel bypass switch is pushed. That's just the galactic fairies being excited and everyone knows fairies are good.


Sound Clips

Sound samples are only examples of what's possible. You may download lossless higher resolution versions of our sound clips or let us know what you'd like to hear.  Please note that the clips below were created using the original version of Pentode.  Similar tones can be created using Mk2 with the bias jumper set to "Rich" and the Baxandall EQ bypassed.



What is Colour

Colour is an exciting new modular platform for creating your own custom analog signal chains. The ever-growing family of modules allows you to bring multiple stages of high end analog processing to your setup a la carte.

The Colour platform consists of Colours and Palettes. Colours are ultra-compact, swappable analog circuit blocks that snap into the Palette, and impart various types of analog color such as distortion, saturation, compression, and even echo. The Palette provides input and output controls, power, and support circuitry for up to three Colour modules.

Currently, the Palette is available as a 500 Series unit from DIY Recording Equipment. In the near future there will be rackmount and Eurorack versions of the Colour Palette as well.

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    Policies & FAQ

    14-day No Hassle Return Policy

    Try out our gear in your studio and, if within 14 days you're not satisfied, let us know and we'll issue a refund.

    To be eligible for a return, your item must be "like new" and in the same condition that you received it. It must also be in the original packaging with all original materials (power supply, power cord, product card, etc.).  Please refrain from racking 19 inch rackmount gear during this trial period so that the faceplate and enclosure don't get scratched.

    To complete your return, just give us a call or shoot us an email, and we'll send you instructions for packing up your unit and shipping it back.  Please note that you will be responsible for return shipping costs and we ask that you insure the unit for its full retail value to protect against loss or damage.  You are responsible for ensuring the products arrive safely at our shop.  Once we receive and inspect the unit we will issue a refund for the purchase price less the cost of shipping.  Units received in any condition other than "like new" may be subject to a restocking fee.

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    World-Class Shipping

    We ship to (just about) any address in the world via USPS, UPS, FedEx, and DHL Express. When you place an order, we will estimate shipping delivery times for you based on your location and the shipping option you choose.  Delivery time estimates are given on the checkout page.  Once payment is approved, in stock products, other than Silver Bullets will ship out from Rogue Planet Command within 2-3 business days.  We ship Silver Bullets within 7-10 business days.  Once an order ships you will be sent tracking information via email and/or Facebook Messenger (if selected at checkout).  Please coordinate with the shipping company to have your package held for pickup if you know you will not be home when the package is expected to arrive.

    Please note that the shipping rates for many items we sell are dimensional weight-based. To reflect the policies of the shipping companies we use, weights may be rounded up to the next full pound.  We may substitute UPS for FedEx ground service and vice versaWe also may upgrade UPS and FedEx ground service to USPS Priority Mail if we are feeling extra nice.  

    Also note that international customers are required to pay all import duties and taxes required by their respective countries.  When filling out customs forms we declare the actual purchase price.  Please do not ask us to declare lower values.

    If you reside outside of North America, we highly recommend DHL Express when ordering a Silver Bullet for the quickest delivery and with zero customs headaches.  If you are in Canada we recommend selecting USPS instead of FedEx or UPS since the customs process is easier and less money.

    We require a signature for all Silver Bullet orders to help ensure you safely receive the package.

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    When can I expect to receive a response to my email or phone call?

    Most emails or phone calls will receive a friendly reply within 24 hours, and often within just a few hours.  However, sometimes we get sucked into the glorious nebula of designing and building products.  Or need to do laundry, shop for groceries, or sleep.  We appreciate your patience as we balance the demands of our intergalactic commitments, and try to enjoy time off on the weekends.  Please don't be upset if an email you sent on Friday evening doesn't get returned until Monday or Tuesday morning.

    Do you have Silver Bullets in stock?

    Please check the FAQ tab on the Silver Bullet product pages for up-to-date information about stock, production status, and shipping dates.

    How much will it cost to ship my order overseas?

    Our shopping cart has a shipping calculator that is configured to estimate shipping to anywhere in the world.  All you have to do is add a product to the cart and then click the cart icon in the upper right corner of your browser.  At that point you can select your country, province, and enter your postal code.  A list of available shipping options will be displayed after you click Calculate Shipping.  As mentioned above, international customers are responsible for paying all import duties and taxes for their respective countries.

    What shipping option do you recommend for European customers?

    If you are ordering a Silver Bullet or 500 series module, we highly recommend that you select DHL Express shipping.  DHL acts as the customs broker and offers exceptionally quick door-to-door service.  We've been seeing packages arrive in the UK in 4-5 days.  There is no hand off with local postal services like there is with USPS so you will know where your package is every minute of the day by accessing the tracking information. They will require you to pay all customs and import taxes before delivering the package to your door.

    My country charges high import taxes.  Can you adjust the customs value to help me out?

    Sorry, but no.  As a rule, we declare the actual purchase price on all customs forms.  Defrauding a foreign government is not a wise business move.

    Do you accept wire transfers, ACH payments, or Paypal as forms of payment?

    We only accept payment through our online store using major credit and debit cards at this time.

    How are you guys able to sell products of this quality level at these impossibly affordable prices?

    We simply reject the notion that a middleman like a dealer or distributor needs to come between the guy that designs and builds the gear and the artist that uses it.  By adopting a direct sales model we have been able to pass that savings onto our customers.  Do you really want to pay 30% more for your gear?  All we ask in return is that you make lots of great music and help spread the word about our company and products.

    Can I have my favorite pro audio dealer get me a Silver Bullet?

    Sure, if you want to pay more money for our products.  See the question above.  Our pricing model does not allow for typical dealer margins.  Really.  If you'd like to order 10 Silver Bullets we'd be happy to give you a sweet discount though.

    I just bought a used unit from some dude online.  Can I have the seller send it to you first to check out?

    As a policy, we decline to get in the middle of third party transactions on used gear.  If you receive the unit and it requires repair please contact us and we can go over service options.  

    What in the bloody galaxy is Void Corp?

    Void Corp is a character in the Louder Than Liftoff universe.  Some of our products are made as limited edition Void Corp versions with a black aesthetic.  Click the link for more info.

    It would be really cool if you guys had t-shirts.  Can you make me one?


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