MU524 Vari-Mu Tube Compressor for 500 series

$429.00

$419.00 VAT incl.

$419.00 VAT excl.

The MU524 is a Variable Mu tube compressor which, with the help of two transformers, provides a smooth and vintage sounding soft knee compression.

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Stereo Right

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MU524

The MU524 is a compressor where the gain variation is provided by varying the mu (gain) of a special tube.

With the help of two transformers it provides a smooth and natural soft knee compression which can travel into land of distortion when driven hard.

It is a professional-grade unit that brings the warmth and character of vintage gear to the 500 series world.

Install it in your API* compatible Lunchbox^TM rack and start working.

Highlights

Based on classic vari-mu compressors like Altec 436 / RS124,
Natural soft knee compression,
Great on single instruments, brilliant on full mixes,
Balanced dual triode design,
New, old stock (NOS), remote cut-off tube,
Two Transformers in the audio path,
Illuminated SIFAM meter,
Optional High pass filter in the sidechain,
Two units can be linked for stereo,
Hardware relay bypass,
Available assembled or as a full kit.

Controls

1: IN/BYPASS/LINK

IN (left): Compressor active,
BYPASS (center): Hardware relay bypass,
LINK (right): Compressor active and stereo link connected for stereo operations.

2: METER Shows the gain reduction from 0 to -20dB.

3: IN Sets the input level to the compressor which also defines the threshold at which the compression appears.

4: LIMIT Increases the compression ratio to a limiting level.

5: OUT Sets the makeup gain of the compressor.

6: HPF Inserts a high-pass filter in the sidechain which produces a fat sound and eliminates bass driven pumping.

7: REC. Recovery sets release time of the compressor.

8: FAST ATTK Shortens the attack time of the compressor.

What's in the kit?

Absolutely everything!

Passive components (resistors, capacitors, inductors),
Transformers,
Active components (tube, diodes, transistors, IC's),
Control elements (meter, switches, potentiometers, knobs),
Connectors, relay,
PCB's,
Front panel and side panels,
All hardware.

You bring the solder (use good quality solder, 1mm diameter max) and the Lunchbox.

Difficulty level

The MU524 kit is a medium difficulty kit. It can be undertaken by anyone who is able to make a clean solder joint.

The setup is a little more complex than average. It requires a good quality digital multimeter.

Reference PK022

Specific References

Technical specifications

Measure	Conditions	Value
Idle supply current	No input signal	V+ : +125 mA V- : -125 mA
Input impedance	IN varying from 0 to 10	4.5 to 15 kΩ
Maximum input level	defined by the IN potentiometer	No limit
Maximum output level before clip	No gain reduction	+27.5 dBu
Frequency response	Deviation=+/-0.2dB	20 Hz - 20 kHz
Attack time	Slow/Fast	10 mS / 1.2mS
Release time		From 50 mS to 1 S
Ratio	Limit OFF	From 1.2 to 3.5
Ratio	Limit ON	From 1.5 to 7

Documentation

DOCS Code	Documents
From DOCS-24	User manual Parts list Components layout Assembly guide Setup guide Schematic

Reviews

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Grade

Ben
06/15/2023

Best compressor I have heard!!!

I have a lot of good compressors in my studio. Heritage Audio Successor, Tegeler Audio Creme, AML 52F50 (Neve 2254), FMR Audio RNLA500, CP5176 (1176) and Golden Age Comp 2A etc.
They are all good compressors. Specially the Tegeler Creme, AML 52F50 and CP5176 are great and I use them all the time. But the MU524 is outstanding!
Haven't heard anything like it. It's like breathing new life into vocals, instruments and Master-Bus. The compression is smooth, but the overall sound is many times better than bevor. How is this possible?
Great job Sound Skulptor!!!

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MU524 Vari-Mu Tube Compressor for 500 series

The MU524 is a Variable Mu tube compressor which, with the help of two transformers, provides a smooth and vintage sounding soft knee compression.

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