Soviet Pentode Colour Module

$79.00 ex. VAT

  • Mix and Match HRK Colour Modules!


Soviet Pentode | USSR NOS Tube Pentode Colour Module

  • Thermionic Valve Saturation Colour Module
  • Class A Operation
  • Pentode / Triode Mode
  • NOS Military Grade USSR Tube
  • Low Power Consumption
  • Low Voltage – Safe to Use
  • On-Board Regulator and Filters
  • Compatible with DIYRE Colour Format

The Soviet Pentode is a true Class A tube saturation Colour Module. The Soviet Pentode is built with sub-miniature, military-grade, USSR made, NOS thermionic valve.

The Soviet Pentode can operate in Triode or the Pentode Mode. Each mode offers different Saturation characteristic which results in different tonal results.

The Triode Mode has lower gain, produces mainly second harmonics and the sound is warmer, more mellow.

The Pentode Mode delivers 3dB higher gain, overdrives much quicker, produces more of 3rd and 5th harmonics and the sound is more bright and crisp.

Both Operation Modes add natively occurring tube compression.

The Module does not use any DC/DC converter and does not contain dangerous high voltage.

Low-Power Miniature Valve

The Soviet Pentode Colour Module uses the Low-Power NOS Military Valve designed for operation in Low-Voltage conditions.

No under-voltage of the Tube is happening. The Soviet Pentode valve works according to the specification sheet producing a rich palette of harmonics.

Important User Note!

The Soviet Pentode requires time to heat-up. Allow 5 minutes wait time to ensure proper operation of the Tube Colour Module.

HD Audio Samples

      Stranger Synth - Dry
      Stranger Synth - Soviet Pentode - Triode Mode | More Drive
      Stranger Synth - Soviet Pentode - Triode Mode + Discrete Line Driver | More Drive
      Stranger Synth - Soviet Pentode - Pentode Mode + Discrete Line Driver | More Drive
      E-piano - Dry
      E-piano - Soviet Pentode - Triode Mode | More Drive
      E-piano - Soviet Pentode - Pentode Mode | More Drive
      E-piano - Soviet Pentode + Discrete Line Driver - Pentode Mode | More Drive
      Drums - Dry
      Drums - Soviet Pentode - Pentode Mode | More Drive
      Drums - Soviet Pentode + Discrete Line Driver - Pentode Mode | More Drive
      Track Mastering - Dry
      Track Mastering - Soviet Pentode - Pentode Mode
      Track Mastering - Soviet Pentode + Discrete Line Driver - Pentode Mode

The US Pentode Compared to the Soviet

The US Pentode Colour Module shares some similarities with the Soviet Pentode Colour Module. Both Colour Modules have the Pentode/Triode selectable operation mode and can operate at lower, safe voltage without sacrificing the performance.

The difference is in the type of tonal results which both tube colour modules can provide.

The Soviet Pentode produces darker and a bit lo-fi tone, especially in the Triode mode. If you are looking for an old-school sound for your synth or vocal, the Soviet Pentode is a perfect choice.

The US Pentode will produce more “Hi-Fi” tone, brighter, with a glass-like shine. If you wish to add some sparkles to the guitar or vocal, you should choose the US Pentode.

Learn more about the US Pentode ->

HRK Soviet Pentode vs LTL Pentode Colour Module

Colour Module

HRK Soviet Pentode

LTL Pentode Colour Module

USSR NOS Pentode NOS Raytheon 6418
Pentode Mode
Yes Yes
Triode Mode
Yes No
Discrete Components
Yes No
Integrated Circuits
No Yes

Comparison between LTL Pentode Colour Module and the Soviet Pentode Colour Module – read more.

Soviet Pentode Colour Module

I took a moment to try them on stems. The Soviet Pentode is amazing!

Perfect to add that tube amp like breakup on a clean guitar track for example.

The Line Driver seemed to be the cleanest of all three.

I definitively need to try the different jumper configurations. Would be interested to have your opinion on this one!


How to Use and Install DIYRE Colour Format Modules

HRK Colour Modules – True Analogue Plugins – FAQ

Item Condition

Brand New, Assembled and Tested.

Every single HRK product is carefully tested with Audio Precision test equipment before the shipping to ensure hassle-free operation.

Payment & Shipping


All Items are dispatched from the European Union within 1-3 working days.

We offer fast worldwide UPS shipping with tracking.

FREE delivery is available for orders over the 249USD to EU, USA and Canada.

FREE delivery is available for orders over the 299USD to Australia, New Zeland, Japan and other destinations.

Please check the shipping cost during the checkout.

Delivery to other WorldWide destinations – 24.99USD

EU Business Customers

All prices exclude the VAT Tax.

If you have the EU VAT number you can purchase the products available in the Bart HRK Shop with no VAT Tax.

Please enter your EU VAT Number at the checkout and the VAT will be deducted from the Total Payment.

Non-EU Customers

Customers from outside the EU can purchase the items with no VAT.

Please select the destination country and the VAT will be removed automatically.

If the VAT is not removed, please email customer service via the contact form and custom invoice will be issued.

Orders from the USA below 800USD are customs tax-free.

Payment Options:

You can pay for your order with any Credit Card



Input impedance: 10kOhm

Output impedance: 100R

Phase inverse: none

Gain: 0dB

All HRK Colour Modules are fully compatible with DIYRE Colour Format

All HRK Colour Processor and Preamps fully compatible with DIYRE Colour Format

All HRK 500 products are fully compatible with API 500 Format