PHONO PRE-AMPLIFIER PPA V600 USER´s MANUAL 1
Content Theme Page About Violectric Safety Instructions The Earth / Grounding Concept Connection / Connectors General Operation Input Impedances Input Capacities Setting the Equalizer Opening the Case / Dismantling Things to know Disposal Technical Data Jumper Setting Conformity Statement Warranty 2 3 5 7 9 10 11 15 16 17 20 21 24 25 26 27 28
Cordial thanks for your decision in favour of a product ! is a trademark and product line of Lake People electronic GmbH. Lake People electronic GmbH develops, manufactures and distributes products in the professional range, for broadcast, television, airports, exhibition halls, festival venues, theatres, large-scale installations, private studios and more. In the private sector as well, Lake People products become increasingly popular due to their outstanding quality.
How do devices get to the customer ? devices can be obtained from respective specialist suppliers. If there is none such accessible regionally, the customer is supported by transregional distribution partners (google may help...) and, of course, by Lake People electronic GmbH themselves. … and if it doesn't work like it should ? devices are covered by a 24-month warranty. In case of any malfunction during this period, they can be shipped to the manufacturer directly.
General Safety Instructions WARNING For your protection, please read the following: Water, Liquids, Moisture: This appliance should not be used near water or other sources of liquids. Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. Power Sources: The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.
Mains Fuse: The mains fuse of this appliance is soldered in place and accessible from the inside only!! A blown fuse may indicate an internal problem and should be replaced during qualified servicing or repair work !! Power Supply: Connect this unit to the power source indicated on the equipment rear panel only to ensure safe operation !! This unit is provided with a multi-mode switch-mode supply and accepts mains voltages from 90 … 250 V AC and thus is suitable for glueless worldwide operation.
The Earth / Grounding Concept General GROUND-LIFT Jumper (accessible from the inside. Mind the SECURITY INSTRUCTIONS !! ): Ex-works this jumper is set to the LIFT position. The internal ground potential is “lifted” by means of this jumper. As a result, the interconnection for DC voltages and lower frequencies (< 150 Hz) will be cut. Higher frequencies will be bled off to earth potential through the RC filter. The LIFT position is helpful in case of hum or jitter caused by different ground/earth potentials.
Unfortunately there is no general recommendation how to solve hum and jitter problems - or even minimize them. The best way to succeed is to check different options !! In case of balanced cables, it should always been verified if the shield of the cable is connected to the shell of the XLR connector. The shell is ALWAYS connected to earth potential when the connector is inserted !! Concerning ANALOG inputs and outputs, the relationship between ground and earth may be modified.
Connection / Connectors for analog signals 9
GENERAL INFORMATION The PPA V600 is a high-quality, two-channel preamplifier for movingcoil and moving-magnet pickup systems. Its groundbreaking design allows a variety of setting possibilities second to none. Due to the implementation of professional instrumentation amplifiers in the input section, it offers extraordinarily low noise figures and extreme bandwidth even at high gain.
THE CASE The PPA V600's case as well as the front/rear panels are made of solid aluminium. This choice of material ensures high mechanical stability and resistance. EARTH AND GROUND The PPA V600's case is grounded. Internal reference ground is bridged to protective earth by means of a jumper. The jumper is set to the 'LIFT' position (see also: page 7 "Earth/Ground concept" and pages 20/26 "Technical Appendix").
THE BALANCED SIGNAL INPUT For the connection of balanced signals a gold-plated 5-pin XLR socket is located in the 'cartridge input' section on the rear of the unit, denoted as 'BAL'. 5-pin XLR Pin-Out: PIN 1 Left (+) PHASE PIN 2 Left (-) PHASE PIN 3 Ground PIN 4 Right (-) PHASE PIN 5 Right (+) PHASE THE UNBALANCED INPUTS Or the connection of unbalanced signals two gold-plated cinch sockets are located in the 'cartridge input' section, denoted as 'UNBAL L' and 'UNBAL R'.
OPERATION The following controls and displays are located on the front panel: POWER SWITCH The unit is turned on by means of the power switch. The blue LED beneath the switch indicates that the unit is ready for operation. GAIN SWITCH The gain switch on the front panel allows easy signal gain control, offering six possible settings: 30 / 36 / 42 / 48 / 54 and 60 dB.
which, however, can easily be compensated by the balance control, with an adjustment range of +/-2 dB and a detented centre position. In order to maintain minimum crosstalk, balance is set by means of fine adjustment of the right channel, instead of a conventional balance pot as found on other devices. AMPLIFIERS / INTERNAL SETTINGS The low input signals are fed to a so-called instrumentation amplifier, originally intended for the use with professional microphones.
INPUT IMPEDANCE Input impedance can be precisely matched to the respective MC (moving-coil) system by means of switchable input impedance. The value matching best can either be read in the pickup's technical specifications, or optimized by further recommendations and listening tests. Settings comprise 10, 90, 100, 130, 150, 250, 330, 1k and 47k ohms, whereas 47k is recommended for MM (moving magnet) systems. The unit's case must be opened to change this setting. See also: technical appendix, pages 20 / 26.
INPUT CAPACITANCE Input capacitance can be precisely matched to the respective MM (moving magnet) system by means of switchable input capacitance. The value matching best can either be read in the pickup's technical specifications, or optimized by further recommendations and listening tests. Settings comprise 33, 66, 110, 150, 180, 210, 260, 300, 330, 370, 410, 450, 480, 520, 560 and 600 pF. Input impedance for MM systems should be set to 47k ohms ! The unit's case must be opened to change this setting.
EQUALIZATION CURVES 17
EQUALIZATION CURVES Due to technical considerations, the signal stored on vinyl records has been equalized during manufacture, i.e. low frequencies are reduced and high frequencies are boosted. Upon playback in turn, an equalizer as accurate as possible is employed in order to re-linearize frequency response.
THE UNBALANCED OUTPUTS The unbalanced output signal is available at gold-plated cinch sockets on the rear panel. They are denoted as 'UNBAL L' for the left channel, and 'UNBAL R' for the right one respectively. Output impedance is significantly less than 1 ohm ! THE BALANCED OUTPUTS The balanced output signal is available at gold-plated XLR connectors on the rear panel. They are denoted as 'BAL L' for the left channel, and 'BAL R' for the right channel respectively.
OPENING THE UNIT In order to change any DIP switch or jumper settings inside the PPA V600, its case must be opened. For this purpose, a TORX screwdriver T10 is required, and you should - by all means - PULL THE MAINS PLUG !!! after which any setting procedures can be effected without risk. Disassembly 1. 2. 3. 4. 5.
The PPA V600 offers both balanced and unbalanced inputs. What's the advantage of a balanced signal ? In contrast to unbalanced signals, balanced signals are transmitted via two wires plus ground connection. A balanced signal is accomplished by inverting the original source signal at unaltered level. One wire carries the original, unaltered signal (a), the second wire the inverted signal (-a).
Even high-end pickup systems may exhibit a channel level aberration of up to 3 dB. This value represents the loudness difference between channels, resulting to a shifted stereo image - or centre position - during playback. The fineresolution balance control allows shifting of the perceived centre position to where it actually should be, of course with a detented neutral position. In order not to impair crosstalk rejection, balance control is achieved by fine adjustment of the right channel only.
For this purpose, the equalization curve applied during record manufacture must be known. Quite a number of equalization curves were used over the decades however, among which the 'RIAA' curve became the most widespread - named after the Recording Industry Association of America. Other equalization curves one may encounter are 'NAB' (National Association of Broadcasters) or 'BBC' (British Broadcasting Corporation), which can also be properly handled by the PPA V600 when set accordingly.
One possible solution would be the use of a remote power supply, which of course means additional costs for the customer due to an extra device and cabling. As an equalizer preamp consumes little power at quite constant current, and short ways between current source and load generally make sense in terms of voltage decoupling, a switching-mode power supply is the most intelligent solution here. The PPA V600 contains two thereof, i.e. one for each positive and negative voltage supply.
TECHNICAL DATA PPA V600 All measurement RMS unwtd., 20 Hz - 20 kHz if not otherwise noted Inputs: Max. Input Voltage: Input CMRR: Input Impedance (int. switchable): Input Capacity (int. switchable): Gain (ext. switchable): Balance: Filter Laws (Values in us): Filter Deviation absolut: Filter Difference (L < > R): Phase Difference (L < > R): IEC Lo-Cut (int.
EU CONFORMITY STATEMENT: We herewith declare that the following unit Name: VIOLECTRIC PPA V600 Serial No.
WARRENTY Since 1986 we are constructing and manufacturing sophisticated electronics for ambitious customers. Since the early beginnings we are trying hard by accompanying measures, the use of 1st choice components and multiple quality checks during production to avoid faults at large. We are quite effective in that and this is – amongst others - why we enjoy such a good reputation. Despite all accurateness faults may occure which may derogate the proper operation of your product.
