TECHNICAL SPECIFICATIONS

Circuit Design: Based on the classic 4000E (E01) console preamp architecture
Format: 500 Series (VPR Alliance & GDIY 51X compatible)
Gain Control: 16 dB to 68 dB stepped gain via high-precision Grayhill switch
Input Stage: Original Jensen JT-115K-EPC input transformer
Output Stage: Electronically balanced via THAT 1646 IC
Output Fader: -∞ to +12 dB attenuation/boost post-preamp
Expansion: 1x DIYRE Colour Module compatible slot
Power Requirements: Standard ±16 V/+48 V DC (500 Series rack)

DETAILED FEATURES

Authentic 4000E Console Character: Original Jensen JT-115K-EPC transformer imparts signature analog weight, dimension, and harmonic warmth
Stepped Grayhill Gain Control: 16–68 dB in precise steps for 100% accurate session recall
Output Fader (-∞ to +12 dB): Allows you to drive the preamp and input transformer into sweet saturation while controlling the final level going to your DAW
Switchable LED Metering: Internal switch lets you monitor signal level either pre-fader or post-fader, paired with a dedicated post-preamp Peak LED
DIYRE Colour Module Compatibility: Expand your tone palette by dropping in an optional saturation, compression, or EQ colour circuit board
Steep 24 dB/oct Sweep Filters:
- Low-Cut Filter: Continuously variable from 10 Hz to 250 Hz (24 dB/oct)
- High-Cut Filter: Continuously variable from 3.5 kHz to 20 kHz (24 dB/oct)
Complete Channel Utilities:
- +48 V phantom power switch for condenser microphones and active DIs
- Polarity (phase invert) switch
- -20 dB input pad for hot line-level sources or loud drum tracking
Premium Components: Built with high-grade conductive plastic potentiometers for ultra-smooth travel and long-lasting durability

WHAT'S INCLUDED IN THE KIT?

This is a full DIY kit including all hardware and electronic parts:

Powder-coated front panel with high-quality printing
Original Jensen JT-115K-EPC input transformer
Stepped Grayhill gain switch and pots by TT Electronics/Alps Alpine
All electronic components (resistors, capacitors, ICs, and THAT 1646 driver)
Complete set of control knobs and hardware

(Note: Requires assembly and soldering skills. Interactive step-by-step assembly guides are available in our Build Manuals section.)

Help yourself and others in the corresponding GroupDIY Help Thread

SL4K-E01

Name: SL4K-E01
Price: 319.84 EUR
Availability: InStock

From €319.84

Excluding Sales Tax

Kit / Assembled

Revision

Quantity

Iconic 4000E Console Preamp Punch for the 500-Series Format

The SL4K-E01 is a 500-series microphone preamplifier based on the original E01 schematics of the legendary 4000E console. Equipped with the genuine Jensen JT-115K-EPC input transformer, the SL4K-E01 delivers that unmistakable depth, crisp transient snap, and silky top end that shaped countless hit records throughout the '80s and '90s. Now, you can build this iconic console channel for your own setup.

For absolute precision and instant session recall, input gain is controlled via a high-quality stepped Grayhill switch. The dual op-amp gain topology combines rich analog transformer character at the input with an ultra-clean, electronically balanced THAT 1646 output driver.
To offer maximum flexibility during tracking and mixing, the SL4K-E01 features a dedicated Output Fader (-∞ to +12 dB). Drive the input stage and Jensen transformer hard for harmonic saturation, then safely back off the final level before hitting your converters. Complete with switchable LED metering (pre- or post-fader), continuous 24 dB/oct High- & Low-Cut filters, and a DIYRE Colour Module slot, this preamp delivers true desk character in a compact 500-series module.

Product name: SL4K-E01 Product identifier: 4K3322/4K3344 Manufacturer: Link Audio Design, August-Bebel-Str.18, 08373 Remse, linkaudiodesign@gmail.com
Shipping Rates: Calculated based on your location and the weight of your order
Domestic Shipping: Standard shipping within Germany via DHL
Economy Worldwide: Slow shipping up to 0.5 kg via DHL Envelope Service (up to 20 days delivery time)
Express Options: UPS Expedited and Express Saver available at checkout
Returns: Untouched DIY kits can be returned within 14 days of receipt (EU orders only; see our Return Policy for details)

SL4K-E01

Product Information

Shipping and Return

high-resolution audio samples of our kits in direct comparison

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