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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:
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 make it possible to
obtain a complex release-time slope. (See page 4)
Owners manual
TUBE-TECH
CL 1B Compressor
1.
Fixed attack and release times
2.
Variable attack and release times
LYDKRAFT ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
(140919 jgp)
1
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Table of Contents
Summary of Contents for TUBE-TECH CL 1B
- Page 1 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.
- Page 2 COMPRESSOR INTERCONNECTION: The side chain sockets for interconnection of several compressors are located on the rear panel. A switch (BUS SELECT) on the front selects which compressors are interconnected, and on which bus they are connected. If you e.g. have 10 compressors in a rack, you can select compressor 1,5,7 and 8 on bus 1, and compressor 2,3,6 and 9 on bus 2, leaving compressor 4 and 6 in the off position.
- Page 3 CONTROLS: GAIN: The gain control is used to "make up" for the gain loss, which takes place when the unit is compressing. It is placed after the gain-reduction circuit and therefore has no influence on the threshold setting. The gain-control is continuously variable from off to +30 dB.
- Page 4 ATTACK/RELEASE SELECT: This switch selects how the compressor reacts to an increase (attack) or decrease (release) of the input signal. There are three settings of the switch: Fixed. Attack time: 1 msec Release time: 50 msec Manual. Attack time: from 0.5 msec to 300 msec Release time: from 0.05 sec to 10 sec Fix/man.
- Page 5 In the following, you will find suggestions on various applications of the TUBE-TECH compressor CL 1B. They are given as a convenient guide to enable you to familiarise yourself with the different aspects of using the compressor. We have not mentioned specific settings of gain and threshold as they are dependent upon input levels.
- Page 6 ADJUSTMENT PROCEDURE: CAUTION: Before making any adjustment let the unit heat-up at least 15 min. Observe that the offset-voltage measured at the side chain jack socket, when the THRESHOLD is off, is not greater than +/- 15 mV DC in both position "fixed" and "manual". (tip is bus 1 and ring is bus 2).
- Page 7 ADJUSTMENT OF THE VU METER READING "COMPRESSION": Turn the THRESHOLD-control fully counter-clockwise. Switch the METER-selector to Compression. Set the RATIO-control at 2:1 Apply a signal of 1 kHz, 0,0 dBU into the input of the compressor. Adjust the GAIN-control to an output-reading of 0,0 dBU. Adjust P 4 (P 2)* until the meter is reading 0 VU.
- Page 8 Over view of the sidechain PCB PCB 870316-0,1,2 0VU -10VU -10dB Rel. 10 Sec. PCB 870316-3 0VU -10VU -10dB Rel 10 Sec. 101115 LYDKRAFT ApS Mose Allé 20, DK 2610 Rødovre Denmark...
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