Tube-tech CL 1B Opto Compressor User Manual download pdf

LYDKRAFT ApS

Mose Allé 20, DK 2610 Rødovre

Denmark

TUBE-TECH CL 1B

Compressor

DESCRIPTION.

The TUBE-TECH compressor CL 1B differs from many other compressors, in that the gain-

reduction element is made from a non-semiconductor element, which in itself has a very low

harmonic distortion and none of the non-linearity problems involved when using most

semiconductor elements. Furthermore there is no long-term degradation of the element thus

giving it almost infinite life. This element is placed after the input-transformer of the compressor

and followed by an all tube-based amplifier with a gain of -



dB to +30 dB.

Thus the signal is not fed through any semiconductor circuitry on its way to the output.

The amplifier consists of two tubes (valves) in push-pull configuration (one ECC 83 as the

pre-amp and phase splitter, and one ECC 82 as the output stage), and an output transformer.

The power supply for the pre-amp and phase splitter are stabilized and the heaters of both

tubes (valves) are fed with a stabilized DC voltage.

The whole amplifier (including input and output transformer) and the power supplies are placed

on one PC-board.

Both input and output are balanced (600



) and fully floating.

The in/out key switches the compressor in and out without clicks.

THE SIDECHAIN:

The side chain is the only part of the compressor that contains semiconductors. They are used

for three reasons: First they do not affect the sound reproduction, second they have a high slew

rate, which is of importance for the performance of the compressor and third they don't take up

much room.

It contains two J-FET quad op-amps, one npn-transistor and one FET-transistor, which handles

the signal for the gain-reduction element.

The compressor contains two time constants circuits:

1. Fixed attack and release times

2. Variable attack and release times

The

attack/release select

switch makes it possible to use these two circuits separately or

combine their functions.

This gives a feature not normally obtained in other compressors:

In the combined (fix. /man.) state the attack- and release controls makes it possible to

obtain a complex release-time slope. (See page 4)

(980112)

1 2 3 4 5 6 7 8 9

Summary of Contents

Page 1

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark1TUBE-TECH CL 1BCompressorDESCRIPTION.The TUBE-TECH compressor CL 1B differs from many other compresso

Page 2 - (980112)

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark2COMPRESSOR INTERCONNECTION:The side chain sockets for interconnection of several compressors are loca

Page 3

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark3CONTROLS:GAIN:Thegaincontrol is used to "make up" for the gain loss, which takes placewhen

Page 4

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark4ATTACK/RELEASE SELECT:This switch selects how the compressor reacts to an increase (attack) ordecreas

Page 5

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark5SUGGESTED APPLICATIONSOFTUBE-TECH COMPRESSOR CL 1BIn the following, you will find suggestions on vari

Page 6

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark6ADJUSTMENT PROCEDURE:CAUTION:Before making any adjustment let the unit heat-up at least 15 min.Observ

Page 7

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark7ADJUSTMENT OF THE VU METER READING "COMPRESSION":1) Turn theTHRESHOLD-control fully counter

Page 8

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark8Over view of the sidechain PCBPCB 870316-0,1,2P2 P3 P1 P50VU -10VU -10dB Rel. 10 Sec.PCB 870316-3P4 P

Page 9 - All specifications at RL=600

LYDKRAFT ApSMose Allé 20, DK 2610 RødovreDenmark9TECHNICAL SPECIFICATIONS CL 1B:Input impedance: 600 OhmsOutput impedance: < 60 OhmsFrequency-respo

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Tube-tech CL 1B Opto Compressor User Manual

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