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s o u n d e n g i n e e r i n g
The MEC-1A encompasses the all tube based designs of the MP 1A Microphone Preamplifier,
EQ 1A Equalizer and CL 1B Compressor in a powerful, two-unit recording package – designed
and hand crafted to deliver the warmth of vintage quality recordings with unrivaled accuracy,
purity and realism.
Product Description
The TUBE-TECH MEC 1A Recording Channel is a one
channel recording unit, featuring a microphone
preamplifier equalizer and compressor. The shelving and
the bell filters are designed around a tube operational
amplifier.
Product Features
Microphone Preamplifier
+20 dB to +70 dB Gain
•
Phantom Power (+48 V)
•
Phase Reverse
•
-20 dB pad
•
Lowcut filter (20 Hz/12 dB oct, 40 Hz/6 dB oct)
•
High-impedance DI-input (>1 Mohm)
•
Equalizer
Three bands with variable Q
•
Low: 20, 30, 50 70, 100 & 160 Hz (+/- 15 dB gain)
•
Mid (Bell type): 40, 60, 80, 130, 250, 500 Hz, 1 kHz,
•
1.6, 2.5, 4, 7 & 10 kHz (+/-12 dB or +/-20 dB gain)
High: 4, 6, 8, 12, 18 & 26 kHz (+/- 15 dB gain)
•
RECORDING
CHANNEL
three-in-one valve solution
Both Input and Output are balanced and have fully
floating transformers with a static screen. The power
supply and the sidechain circuit is based on solid state
circuitry. With the exception of the output stage all
DC voltages are stabilised.
Compressor
Optical gain reduction element
•
Linkable for stereo applications
•
Variable Attack and Release parameters
•
Ratio 1,5:1 to 10:1
•
General
Master Output Gain (off to +10 dB)
•
Clickless swap relay (Eq. <-> Compressor)
•
VU-Meter showing output or compression
•
Frequency response @ -3dB: 5 Hz to 60 kHz
•
Low Noise: < - 85 dBu @ 10 dB gain
•
Conductive plastic potentiometers
•
Reg. power supply w. toroidal transformer
•
MEC
1A
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Table of Contents
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Summary of Contents for LYDKRAFT TUBE-TECH MEC-1A
- Page 1 s o u n d e n g i n e e r i n g RECORDING CHANNEL three-in-one valve solution The MEC-1A encompasses the all tube based designs of the MP 1A Microphone Preamplifier, EQ 1A Equalizer and CL 1B Compressor in a powerful, two-unit recording package – designed and hand crafted to deliver the warmth of vintage quality recordings with unrivaled accuracy, purity and realism.
- Page 2 Mic. Preamp: 20 dB to 70 dB 10 dB to 60 dB Notes All specifications @ R =600 ohm Compressor Lydkraft reserves the right to alter Ratio: 1,5:1 to 10:1 specifications without prior notice Threshold: off to -20 dBu Attack:...
- Page 3 The side chain sockets for interconnection of several compressors are located on the rear panel. A switch (link1/link2) on the front selects which compressors are interconnected, and on which bus they are connected. Lydkraft ApS Mose Allé 20, DK2610 Rødovre Denmark...
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Page 4: Mic Pre-Amp Controls
It goes directly into the preamplifier and has a gain range of +10dB to +60dB EQUALIZER CONTROLS: LOW SHELF: GAIN: The gain control is continuously variable from 0 dB to 15 dB. Lydkraft ApS Mose Allé 20, DK2610 Rødovre Denmark... -
Page 5: High Shelf
COMP in/out: This switch defeats the compressor side chain circuit ATTACK: The attack control chooses how fast/slow the compressor responds to an increase in the input signal. The attack control is continuously variable from 1 to 100 milliseconds. Lydkraft ApS Mose Allé 20, DK2610 Rødovre Denmark... - Page 6 In the position EQ-COMP, the signal from the mike-preamp. goes to the equalizer and thereafter to the compressor. In the position COMP. -EQ the signal from the mike-preamp. goes to the compressor and then to the equalizer. Lydkraft ApS Mose Allé 20, DK2610 Rødovre Denmark...
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Page 7: Adjustment Procedure
8) Apply a signal of 1 kHz, -20,0 dBU to the mike input. 9) A d j u s t t h e p r e s e t “ Gain ” P2 (on amp/psu PCB) to an output reading of +10,0 dBU. Lydkraft ApS Mose Allé 20, DK2610 Rødovre... - Page 8 6) Apply a DC-voltage of +250,0 mV into the side chain jack socket (tip) and observe that the output level has dropped to -10,0 dBU. 7) If this is not the case, adjust the level with P 12, to obtain a drop of exactly -10,0 dB. Lydkraft ApS Mose Allé 20, DK2610 Rødovre Denmark...
- Page 9 9) Remove the DC-voltage from the side chain jack socket (by setting the bus select switch in the neutral position). 10) Repeat step 6 - 9. NB: The VU-meter accuracy should be within +/- 0,5 dB when reading compression. Lydkraft ApS Mose Allé 20, DK2610 Rødovre Denmark...
- Page 10 Notes Ratio: 1,5:1 to 10:1 off to – 20 dBU Threshold All specifications @ RL = 600 Ohm Attack 1 ms to 100 ms Lydkraft reserves the right to alter Release: 60 ms to 2 s specifications without prior notice...
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