ST596 | Analog Harmonics Processor

$279.00 ex. VAT

500 Units246+
ST596 | Analog Harmonics Processor

Stereo Buss Operation

ST596 - The End of Your Struggle!
Did you try countless DAW plugins to get the "true sound" and "analogue warmth" of the vintage studio preamps or consoles? Have you noted that all plugins sound similar, and if you add more plugins, the result is only less satisfying?

It is not much you can do about it... The DAW plugins are the only emulation of the analogue circuits, and your computer is not capable of calculating the mathematics involved in complex physical processes which happen every nanosecond in the analogue hardware.

Have you tried to patch the signal through the clone of the "vintage" mic preamp or compressor, only to battle with noise, hum, and ground loops for hours?

You won't win with the laws of physics. Every time you add the gain, the noise floor will rise, and every cable conducts the electric current, which may create the ground loop...

The ST596 is a solution for all the above and many other problems which almost every music producer or studio engineer has encountered.

Learn more about how the ST596 can help you to enjoy your work.
The Analog Tape Emulator
The ST596 Analog Tape Emulator circuitry is based on the discrete germanium and silicon transistors, including the FET transistor, and delivers the subtle final touch to the processed signal.

Custom coupled inductors act like the write and read tape heads, adding harmonics to the tape recorder.

The level of the tape saturation can be controlled by the level of the signals sent from the WET and DRY knobs. The tape harmonics can be blended with the Tape Mix knob.

The LF Resonant circuit can be engaged with the onboard jumper, which is helpful for vocals and the lead instruments.
The Analog Modeling Circuitry
The ST596 Analog Harmonics Processor uses the custom-designed Analog Modeling discrete circuitry, which produces the complex harmonic content without the usual problems associated with digital or hardware saturation.

The typical way of producing the harmonics is to overdrive the signal with analogue hardware. Usually, the gain has to be increased to achieve the desired results, which also raises the noise and hum levels, normally residing below the audible threshold.

Hardware components such as the thermionic valves, transformers, and discrete circuits produce harmonic distortions, and this process can be described by the mathematical equations.

Simplified equations are used by the computer programs the audio plugins to simulate the properties of the analogue hardware. More advanced plugins use expensive DSP cards to offload the main CPU and deliver more realistic results.

The term Operational Amplifier, the most common electronic component today, has its roots in the long-forgotten past when the mathematical calculations were done by the analogue computers built with amplifiers capable of conducting mathematical operations. Hence the name the Operational Amplifier.

Bart Hrk Analog Modeling Circuitry used in the ST596 does the math of generating harmonics in the real-time analogue domain. No digital approximation, no latency, no CPU bottleneck!

The ST596 does not increase the gain of the processed signal keeping the noise as low as possible. It just adds the harmonics to the source signal.

Although the processed signal can be perceived as louder due to the higher harmonics content, the peak level of the signal remains almost the same.
Intuitive Control and Workflow
The ST596 is easy to use. The number of knobs and switches is limited to a minimum to provide a hassle-free operation.

The Drive knob controls the amount of harmonics produced by the Analog Modeling circuit. Only the harmonics are added to the source signal.

The Wet knob sets the level of harmonics added to the source signal.

The Dry knob controls the level of the source signal and the total output level when the ST596 is engaged.

The Tape Mix knob allows the blending between the signal processed by the Tape Analog Emulator and the signal from the previous stages.

The HFC switch cuts off the high frequencies to remove the air harmonics content. This feature helps with vocals and other HF-rich signals. It can also be used in a creative way.

The LFS switch blocks the LF content passed to the Analog Modeling circuit, preventing the lows from being overdriven. This feature helps with LF-rich signals such as drums, bass guitar, bass synths, and bass tracks.

The Tape-In switch engages the Tape Emulator circuit. The Process switch works as the bypass switch.

Simplified Signal Flow Diagram

HRK Active Transformer

Bart Hrk developed the propitiatory design of an Active Transformer to solve the problems of the common passive transformers.

Passive transformers are susceptible to electromagnetic interferences (50Hz Hum, RF Smog) and the frequency response dependents on load and source impedance, negatively influencing the overall performance of analogue studio equipment.

The HRK Active Transformer delivers the sound that we love, including the harmonics content and the tonal response, and removes all the hassles associated with passive transformers.

The Active Transformer produces a subtle “Air” effect and provides extended LF performance.

The Active Transfomer saturation depends on the output level. Higher output signal levels will saturate the Active Transfomer more, like in the classic studio equipment.

ST596 Demo Videos

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User Manual:

Please read the User Manual before the use of the ST596.

ST596 User Manual
ST596 Recall Sheet

ALL HRK Products Are Brand New - Assembled and Fully Tested

All HRK Products are tested with the industry best audio measuring equipment

Audio Precision System

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

Country / RegionShipping CostCustoms FeeVAT
All 27 European Union Countries Delivery Time: 2-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNO Customs Fees– Yes, for personal orders- Not charged with the EU VAT number
United Kingdom Delivery Time: 3-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNO Customs FeesNo VAT charge. HMRC collects the VAT.
USA, Canada Delivery Time: 5-10 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNO Customs Fees for orders up to 800USD – charged by the USA Customs OfficeNo VAT charge.
Australia Delivery Time: 5-14 Days– 19.99USD for orders below 399USD- FREE shipping for orders over 399USDNo info available – refer to local regulations.No VAT charge.
Switzerland Delivery Time: 3-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNo info available – refer to local regulations.No VAT charge.
Norway Delivery Time: 3-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNo info available – refer to local regulations.No VAT charge.
Worldwide destinations Delivery Time: 3-14 Days– 29.99USDRefer to local regulations.No VAT charge.

EU Customers

The EU Customers will not pay any extra customs fees.

Business customers with valid EU VAT number will not pay the VAT tax.

Please enter your EU VAT Number at the checkout, and the VAT will be deducted from the Total Payment. The VAT number is automatically checked in the VIES database.

For personal orders from the EU, the VAT will be added at the checkout.

UK Custmers

We ship directly to United Kingdom.

UK VAT tax is collected by HRMC

Non-EU Customers

Customers from outside the EU 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 a custom invoice will be issued.

USA and Canada

Orders from the USA below 800USD are FREE from customs tax.

We ship directly to USA and Canada

Payment Options:

You can pay for your order with any Credit Card and Apple Pay!

7 Days Return Policy

Our return policy is a part of the general Terms & Conditions, which you must acknowledge at the checkout. We stand for fair rules and a win-win approach.
We understand that our customers may wish to return the product, and we provide such an option.
However, because we are a small company, we can’t afford to run a grade B outlet shop like big distributors and providing the 30 days return period. We can’t also scrap every returned unit.
We could charge our customers more to offset the cost of the returns, and this is what major distributors do. Or we can keep our prices low and hope that our customers will appreciate our policy.
This is why we provide the 7 days test period after receiving the package with the ordered items. If you wish to return the item, we will accept the return request, providing that the item is not damaged.

If the item is damaged during the transport, we will do our best to help you and provide the replacement product.