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Home » Preamplifiers
MP566 Tube microphone preamplifier for the '500' Lunchbox - Kit
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MP566 Tube microphone preamplifier for the '500' Lunchbox - Kit

Price: 329,00€ (394,80€ Inc. Tax)

The MP566 is a dual-triode vacuum tube circuit preamplifier based on a design that has been used in several famous devices from the 50's, which has been adapted to the '500' format of API*.

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  Product ID MP566
  Updated
18/03/2018
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MP566 Tube Preamplifier


The MP566 is a dual-triode vacuum tube circuit preamplifier based on a design that has been used in several famous devices from the 50's, which has been adapted to the '500' format of API*.

With its fully powered triodes and its two transformers, the MP566 brings the most fulfilling warmth and color to your Lunchbox.

Highlights

  • Dual triode design,
  • Input and output transformers,
  • High 68dB gain will please the most demanding ribbon mics,
  • Variable input and output levels for total control over tube saturation,
  • 2 different negative feedback levels (Mid/High Gain) for sweet or more aggressive sound,
  • Input pad (Low Gain) for hot mics or line levels,
  • Full 225 Volts tube supply and full 150mA tube heater,
  • 1/4" DI jack, high impedance input for instruments or line,
  • Senquenced power-up to limit the total inrush current,
  • Total current draw less than 160 mA,
  • Available assembled or as a full kit (everything included).

Controls

1 IN This potentiometer sets the microphone drive level before the tube stage,

2 Clip LED Green when a signal is present, turns red when getting close to saturation,

3 OUT This potentiometer sets the output signal level. In combination with the IN knob, it allows you to control the amount of tube saturation you want,

4 GAIN 3 position switch

  • LOW : Inserts a -20dB pad before the input transformer. Allows you to manage loud microphone signals or line level signals,
  • MID : Sets 27dB of negative feedback around the tube stage producing a clean and sweet tone,
  • HIGH : Reduces the negative feedback to only 7dB which increases the gain by 20dB and produces a faster, more aggressive tone,

5 POL Reverses the polarity (phase) of the output signal when on REV. In the center position it is a Mute,

6 48V Activate the phantom power for static microphones,

7 DI High impedance direct instrument input, connected to the first triode grid.

Bloc diagram

bloc diagram


What's in the kit?

Absolutely everything!

  • Passive components (resistors, capacitors, inductors),
  • 2 transformers
  • Active components (tube, diodes, transistors, LED's, IC's),
  • Front panel elements (switches, potentiometers, knobs),
  • Connectors, relay,
  • PCB's,
  • Front panel and side panel,
  • All hardware

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

Difficulty level

The kit difficulty level is average. Nothing difficult but because of the high voltage needed by the tube, it is not recommended to beginners. Good soldering practice is required.

There is no setup. A digital multimeter is needed to test the various voltages.

lunchbox

Product Options

XT500 Extender

The XT500 option is a cable extension that allows you to test and setup the module outside the lunchbox while connected.

Go to the XT500 page

501 Case

The 501 case option is a standalone, single slot lunchbox with PSU.
The XT500 Extender is not needed with the 501.

Go to the 501 page

Assembled Product

If you prefer not to DIY, choose an Assembled product.
Assembled products are built on demand and therefore require an additional delay of 2 weeks approximately.
It comes fully assembled, ready to use.


Technical specifications

Measure Conditions Value
Idle supply current   V+ : +155 mA
V- : -155 mA
Input impedance of mic input f=1kHz 1.5 kΩ
Maximum input level   > +20 dBu @ 30 Hz
Maximum output level before clipping f=1kHz +26 dBu
Minimum gain - ∞
Maximum gain HIGH +68 dB
MID +48 dB
LOW +28 dB
Frequency response Deviation=+/-1dB 15 Hz - 30 kHz
Total harmonic distortion (THD) f = 1kHz, Gain = +40 dB, Out level = +10dBu < 0.04%
EIN Zin = 0Ω, Bandwidth=0-30kHz -125 dBu
DI input impedance 1 MΩ
DI gain range - ∞ to +53dB
DI max input level before clipping +13 dBu

 

Documents


  Go to Products technical documentation

  User manual

 
2 Product Reviews - Average rating 5 / 5 (Show All)

Click to review this product

DI extra

Vignolo Sylvain - 31/03/2019

Super préampli, qui remplace, en mieux, mon LA 610.
Super son pour les Basses en DI, avec la possibilité de faire une saturation très jolie dans les bas medium, pas du tout criard (ce qui était marchait très mal avec le LA).


Vintage pleasure

Claudio - 15/04/2018

Not only does the MP566 look cool as hell, it is also a wonderful choice for a retro sound from the 50s and 60s. The circuit design is apparently inspired by the preamps that Bill Putnam Sr. built in his early years for the 610 console. While the original features two valves (one 12AX7 and one 6072), the MP566 comes with one small valve only to fit the size of a 500-series module. Nonetheless, if you are looking for a 'round’ overdrive sound without any harshness, even the small valve used in the MP566 can do good things to your signal. I absolutely love it on a shortscale bass with flatwound strings for a pretty authentic 60’s bass sound. It can also add sweet and creamy harmonics to large condenser mics. Overall, perhaps it’s not your no. 1 go-to preamp that you will use every day, but when you do, you will be glad to have this flavour in your toolbox.

Click to review this product

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