Discrete Line Driver | Class A No-Feedback Transformer Driver
- Inspired by Vintage Console Design from 60’s
- Class A Discrete Driver
- No-Feedback Loop Circuitry
- Custom Made HRK Audio Transformer
- Selected NOS Silicon and Germanium Transistors
- LF Resonant Circuit for Extra Harmonics
- Feedback Loop Option for Cleaner Sound
- Compatible with DIYRE Colour Format
The Discrete Line Driver is the Class A, No-Feedback Loop Transformer Driver Colour Module. The design was inspired by the circuitry from Vintage Console from 60’s.
The Discrete Line Driver is made with Vintage NOS Silicon and Germanium transistors. The main driver circuit is build with three transistors creating a compact circuit with no Feedback Loop!
This special circuit is completely stable in the AC and DC domain. The Driver Circuit is DC coupled with the output transformer.
As a result, the Discrete Line Driver produces plenty of harmonics and provides better saturation of the output transformer.
The FEEDBACK jumper reduces the amount of harmonics and makes the sound cleaner.
The fourth Germanium Transistor in the input stage has the LF resonant circuit. If the LBOOST jumper is shorted, the module produces a low-frequency bump, saturating the output transformer in the LF’s.
The Discrete Line Driver Colour Module produces thick and full sound, just like the line drivers in the Vintage Mixing Consoles.
HD Audio Samples
Stranger Synth - Dry
Stranger Synth - Discrete Line Driver | Less Drive
Stranger Synth - Discrete Line Driver | More Drive
Stranger Synth - Discrete Line Driver + DOPA520 | More Drive
Stranger Synth - Discrete Line Driver with LBOOST | More Drive
Juno Synth - Dry
Juno Synth - Discrete Line Driver | More Drive
Juno Synth - Discrete Line Driver with LBOOST | More Drive
Drums - Dry
Drums - Discrete Line Driver | More Drive
Drums - Discrete Line Driver + DOPA520 | More Drive
Drums - Discrete Line Driver with LBOOST + DOPA520 | More Drive
Guitar - Dry
Guitar - Discrete Line Driver | More Drive
Guitar - Discrete Line Driver with LBOOST | More Drive
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.
All Items are dispatched from the European Union within 1-3 working days.
We offer Fast & Free Worldwide UPS shipping with tracking.
FREE delivery is available for orders over the 249USD to EU, USA and Canada.
Total cart value / Delivery cost:
up to 99USD / Delivery Cost – 19.99USD
99 – 148USD / Delivery Cost – 14.99USD
149 – 248USD / Delivery Cost – 9.99USD
over 249USD – FREE Delivery
FREE delivery is available for orders over the 299USD to Australia, New Zeland, Japan and other destinations.
Total cart value / Delivery cost:
up to 148USD / Delivery Cost – 19.99USD
149 – 298USD / Delivery Cost – 14.99USD
over 299USD – FREE Delivery
Please check the shipping cost during the checkout.
Delivery to other WorldWide destinations – 24.99USD
VAT and Customs Fees
For non-business orders from the EU, the VAT will be added at the checkout.
VAT is removed automatically for orders from outside the EU.
No Custom Fees for EU Customers.
Orders from the USA below 800USD are customs tax free.
EU Business Customers
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.
The VAT number is automatically checked in the VIES database.
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.
You can pay for your order with any Credit Card!
Our return policy is a part of the general Terms & Condition which you have to 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 do provide such option. However, because we are a small company we can’t afford to run a grade B outlet shop like big distributors and provide 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, 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 and if you wish to return the item we will accept the return request, providing that the item is not damaged and we can resell the product with the minimal loss for the company.
If the item is damaged during the transport we will do our best to help you and provide the replacement product.