Manual - Tube Tech
Contents
1. increase in the input signal The attack control is continuously variable from 1 to 100 milliseconds Lydkraft ApS 3 Mose All 20 DK2610 R dovre Denmark RELEASE ATT REL link1 off link2 980112 The release control chooses how fast slow the compressor responds to a decrease in the input signal The release control is continuously variable from 0 07 to 2 5 seconds There are two settings of the switch There are two settings of the switch 1 Fixed Attack time 1 msec Release time 50 msec 2 Manual Attack time from 1 msec to 100 msec Release time from 0 07 sec to 2 5 sec Interconnects several compressors on bus 1or bus 2 There is no difference between the two busses If the switch is left in the mid position the compressor works entirely independently OUTPUT GAIN The gain control is used to make up for the gain loss that takes place when METER NB the unit is compressing The gain control is continuously variable from off to 10 dB The VU meter switch has two positions 1 Compression The VU meter is reading gain reduction It s rest position is 0 VU and the amount of compression is shown as a decreasing deflection in dB 2 Output The VU meter is reading the level at the output socket 0 VU is equivalent to 4 dBm Leave the meter switch in position compression as it might introduce distortion if left in the output position EQ COMP COMP EQ In the position EQ COMP the sign2. 100 160 Hz The frequency is 3dB from max min De Boost cut Determines whether the gain control shall be boosting or cutting aa MIDBAND GAIN The gain control is continuously variable from 0 dB to 20 aB FREQ Hz There is a choice of twelve frequencies 40 60 80 130 250 500 1k 1 6k 2 5k 4k 7k 10k BW The bandwidth control is continuously variable from sharp to broad lt N Boost cut Determines whether the gain control shall be boosting or cutting HIGH SHELF GAIN The gain control is continuously variable from 0 dB to 15 dB FREQ kHz There is a choice of six frequencies 4 6 8 12 18 and 26 The frequency is 3dB from max min a a Boost cut Determines whether the gain control shall be boosting or cutting EQ in out Switches the frequency network in and out COMPRESSOR CONTROLS RATIO The ratio control varies the ratio by which the input signal is compressed If the ratio selected is to 2 1 and the input signal increases 10 dB the output signal is only increased by 5 dB The ratio control is continuously variable from 1 5 1 to 10 1 THRESHOLD The threshold is the point where the compressor begins its action It is defined as the point where the gain is reduced by 1 dB The threshold is continuously variable from off to 20 dBm COMP in out This switch defeats the compressor side chain circuit ATTACK The attack control chooses how fast slow the compressor responds to an 980112
3. 980112 TUBE TECH MEC 1A Recording channel Description The TUBE TECH recording channel MEC 1A is a combined microphone and DI preamplifier equalizer and optical compressor intended for recording directly to any recording media Microphone preamp The microphone preamplifier consists of a microphone input transformer with a static screen with a step up of 10 dB two dual tube preamplifiers with two stepped gain switches one with 10dB step coarse and one 1dB step fine giving a total gain range of 200B to 70cB The microphone input is provided with a switchable 20dB attenuation PAD switchable 48 V phantom power and phase reverse A highpass filter for the microphone and the DI input is switchable between off 20 Hz and 40 Hz The microphone input is capable of accepting levels of up to 6 dBU 1 55V at 40 Hz without the PAD With the PAD switched into the circuit the MEC 1A can be used as a unity gain line amplifier accepting levels up to 26 dBU 15 5V at 40 Hz The high impedance DI input is unbalanced and placed in the circuit directly after the input transformer The gain range for this input is 10dB to 60dB When in use the microphone input is disabled Equalizer The equalizer has low and high shelving filter with a gain range of 15dB each with 6 switchable frequencies and a band filter with a gain range of 20dB 12 switchable frequencies and a bandwidth control The shelving and the bell filter
4. COMPRESSION 980112 10 NB 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 20 0 dBU into the input Adjust the OUTPUTGAIN control to an output reading of 0 0 dBU Adjust P_14 until the meter is reading 0 VU Apply a DC voltage of 250 0 mV into the side chain jack socket and observe that the output level has dropped to 10 0 dBU If this is not the case adjust the compression tracking see above Adjust P_13 until the meter is reading 10 0 VU Remove the DC voltage from the side chain jack socket by setting the bus select switch in the neutral position Repeat step 6 9 The VU meter accuracy should be within 0 5 dB when reading compression Lydkraft ApS Mose All 20 DK2610 R dovre Denmark
5. SHELVING 1 Apply a signal of 20 Hz 20 0 dBU to the mike input 2 Turn the GAIN control at 0 Turn the freq switch to 160Hz 3 When switching between boost and cut observe that the level is exactly the same lt 0 1dB Adjust with P5 located on the front PCB HIGH SHELVING 1 Apply a signal of 20 kHz 20 0 dBU to the mike input 2 Turn the GAIN control a 0 Turn the freq switch to 4 kHz 3 When switching between boost and cut observe that the level is exactly the same lt 0 1dB Adjust with P7 located on the front PCB MIDBAND 1 Apply a signal of 1kHz 20 0 dBU to the mike input 2 Turn the GAIN control a 0 Turn the Freq switch to 1kHz 3 When switching between boost and cut observe that the level is exactly the same lt 0 1dB Adjust with P2 located on the front PCB ADJUSTMENT OF COMPRESSION TRACKING 1 Turn the THRESHOLD control fully counter clockwise 2 Set the RATIO control at 2 1 3 Set the bus select switch at link 1 4 Apply a signal of 1 kHz 20 0 dBU into the input 5 Adjust the OUTPUTGAIN control to an output reading of 0 0 dBU 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 6 Lydkraft ApS Mose All 20 DK2610 R dovre Denmark ADJUSTMENT OF THE VU METER READING
6. The attack release control on the slaves will have no effect The input output capability of the side chain circuit allows up to ten compressors to be linked together They are connected in parallel with a standard 1 4 stereo jack jack cord tip bus 1 ring bus 2 The two jack socket on the rear panel is connected in parallel and both are input output VU Meter The vu meter can be switched between output level and compression Output gain A level control with a gain from off to 10dB is placed at the output of the unit MIC PRE AMP CONTROLS GAIN Coarse The gain switch has a range from 20dB to 60dB in steps of 10dB Fine The gain switch has a range from OdB to 10dB in steps of 1dB LOW CUT The highpass filter is selectable between off 20 Hz 12dB octave and 40 Hz 6dB octave PHANTOM The phantom switch turns the 48V DC power on and off The 48V DC is supplied to the microphone input via two 6 81 KO resistors PAD This switch selects between either 0dB or 20dB attenuation in front of the microphone transformer DI The Direct Input is an unbalanced high impedance input intended for various instruments 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 2 Lydkraft ApS Mose All 20 DK2610 R dovre Denmark FREQ Hz There are a choice of six frequencies 20 30 50 70
7. al 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 All 20 DK2610 R dovre Denmark ADJUSTMENT PROCEDURE 980810 CAUTION Before making any adjustment let the unit heat up at least 30 min Always check the DC voltages at the power supply ADJUSTMENT OF PSU 1 The DC voltage in TP202 shall be 240V Adjust with P201 2 The DC voltage in TP203 shall be 150 0V Adjust with P202 3 The DC voltage in TP204 shall be 150 0V Adjust with P203 ADJUSTMENT OFFSET IN TUBE OP AMPS 1 The DC voltage in TP1 shall be lt 50mV Adjust with P1 THE GRE SHALL BE MARKED BETWEEN 1 005 1 175 ADJUSTMENT OF BASIC GAIN Set the PAD on off N Set the Low cut on off 3 Set the gain control Coarse on 20 4 Set the gain control Fine on 0 5 Turn all Gain controls on the EQ fully CCW and the in out switch on Out 6 Turn the Threshold fully CCW and the Comp in out switch on Out 7 Turn the Output gain fully CW 8 Apply a signal of 1 kHz 20 0 dBU to the mike input 9 Adjust the preset Gain P2 on amp psu PCB to an output reading of 10 0 dBU Lydkraft ApS Mose All 20 DK2610 R dovre Denmark ADJUSTMENT GAIN CONTROLS IN LOW HIGH SHELVING AND MIDBAND 980112 LOW
8. s are designed around a dual tube operational amplifier The equalizer has a separate in out switch Compressor The compressor is of the optical device type It has controls for ratio threshold attack and release A switch selects between manual attack and release and fixed attack and release With the link switch it is possible to link several units together on two independent bi directional buses The compressor has a separate in out switch In normal operation the equalizer is in front of the compressor but a switch enables the compressor to be in front of the equalizer COMPRESSOR INTERCONNECTION 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 1 Mose All 20 DK2610 R dovre Denmark 980112 The interconnection implies that the unit that performs the most compression is controlling the others To choose which one you want to control select the attack release time the threshold and the ratio on that unit and turn the threshold fully counter clockwise on the reminding compressors It is of course possible to have all the interconnected compressors control each other simultaneously NB Remember to set the ratio control and the gain control in the same position on the slaves Otherwise the stereo image could be shifted during compression
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