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EQ550G | PASSIVE GERMANIUM TRANSISTORS 2 BANDS EQ

US$299

500 Units 2 4 6+
Discount -10% -15% -20%
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EQ550G | PASSIVE GERMANIUM TRANSISTORS 2 BANDS EQ
Eq550G Passive Pultec Two Band Germanium Transformer Equaliser

Stereo Buss Operation

Stereo Spk

Germanium Transistors and Passive Audio Transformers

Germanium transistors, when paired with passive audio transformers, produce distinctive harmonic characteristics that are often perceived as sonically pleasing. This effect arises due to the inherent non-linearities in the germanium transistor’s conduction properties, which lead to a smooth, asymmetric clipping of audio signals.

As a result, the transistor amplifies the signal in a way that enriches the sound with even-order harmonics, contributing to a warmer, more “analog” tone. Additionally, when driving a passive audio transformer, these harmonics interact with the transformer’s magnetic saturation and impedance characteristics, further enhancing the overall sound quality.

This combination of germanium transistors and passive transformers effectively adds depth and character to the audio, making it particularly sought after in high-fidelity and vintage audio equipment designs.

1
Create Sophisticated EQ Curves!

The unique feature of Passive Equalizer is the ability to Cut and Boost at the same time.

The EQ550G can create sophisticated EQ curves which cannot be achieved by the active shelf equalizers.

The ability to select three different frequencies independently for Cut and Boost provides countless possibilities in creating custom EQ curves.

The plots below show a few examples of such EQ curves.

2
Standard Cut and Boost Curves

Like any other equalizer, the EQ550G can be used to cut or boost the shelf frequencies.

The plots below show the maximum cut and boost for each band and frequency settings.

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HRK Active Transformer

Hrk Active Transformer

Bart Hrk has developed a proprietary design for an Active Transformer, aimed at addressing the limitations of traditional passive transformers.

Traditional passive transformers are known to be vulnerable to electromagnetic interference, such as 50/60Hz hum and HF RF smog. Additionally, their frequency response is contingent upon load and source impedance, which adversely affects the overall performance of analog studio equipment.

The HRK Active Transformer is a game changer that not only resolves the issues associated with passive transformers but also retains and amplifies the desired characteristics of the transformer output stage. This includes the enrichment of harmonic content and the enhancement of tonal response.

What sets the HRK Active Transformer apart is its ability to deliver the rich, beloved sound that audio enthusiasts seek, including the harmonic content and tonal response, while simultaneously eliminating the drawbacks of passive transformers.

Furthermore, the Active Transformer introduces a delicate “Air” effect and boasts an extended low-frequency (LF) performance, adding depth and clarity to the sound.

Another remarkable feature of the Active Transformer is its dynamic saturation, which is dependent on the output level. As the output signal level increases, the Active Transformer exhibits greater saturation, reminiscent of the warm and rich sound produced by classic studio equipment.

In summary, the HRK Active Transformer is an innovative solution that offers superior sound quality, eliminates electromagnetic interference, and enhances harmonic content and tonal response. It is an invaluable asset for professionals and audiophiles seeking to elevate their audio experience.

EQ550P Specification
  
Input Type / Input ImpedanceBalanced Electronic20k
Output Type / Output ImpedanceBalanced HRK Active TransformerLess than 10R
Initial Gain0dBAll controls set to flat response
Max Output Level+25dBu@1%THDBalanced Signal
Power Consumption60mA max. 
FormatAPI 500 Format 
Phase ReverseNo0 deg.
Static Noise-95dBu@10Hz-22kHzAll controls set to flat response
Germanium TransistorsNOS High-Quality, Selected Components 
ALL HRK Products Are Brand New - Assembled and Fully Tested

All HRK Products are tested with the industry’s best audio measuring equipment – The Audio Precision

Audio Precision is an industry leader in providing high-quality audio testing equipment. They are renowned for their test systems’ precision, reliability, and versatility.

When testing studio audio devices, Audio Precision’s equipment can assess parameters like frequency response, harmonic distortion, intermodulation distortion, phase response, signal-to-noise ratio, and cross talk. In-depth and accurate testing allows the identification of even the smallest issues in audio quality, enabling corrections and improvements that can significantly elevate the overall product quality.

In conclusion, using Audio Precision test equipment is an excellent way to ensure that all HRK products are performing at their best, meeting the standards required for the Professional Studio Applications.

 

Stereo Buss Operation

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 299USD

NO 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 299USD

No VAT ChargeHMRC collects the VAT or additional Fees if applicable.
USA, Canada – Delivery Time: 5-10 Days

– 14.99USD for orders below 299USD

– FREE shipping for orders over 299USD

NO Customs Fees for orders up to 800USD – charged by the USA Customs OfficeNo VAT charge.
Australia, Japan, South Korea –  Delivery Time: 5-14 Days

– 19.99USD for orders below 299USD

– FREE shipping for orders over 299USD

There is no 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 299USD

There is no 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 299USD

There is no info available – refer to local regulations.No VAT charge.
Russia, Belarus – NOT AVAILABLENOT AVAILABLENOT AVAILABLENOT AVAILABLE
Worldwide Destination Delivery Time: 3-14 Days– 29.99USDRefer to local regulations.No VAT charge.

EU Customers

EU Customers will not pay any extra customs fees.

Business customers with a valid EU VAT number will not have to pay VAT tax.

Please enter your EU VAT Number at 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, VAT will be added at 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 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 the USA and Canada

Payment Options:

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

PayPal – We do not use PayPal as a payment method.

7 Days Return Policy

 
Our return policy is a part of the general Terms & Conditions, which you must acknowledge at the checkout. We stand by 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 provide a 30 day return period. We can’t also scrap every returned unit.
 
We can 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, provided that the item is not damaged.
 

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