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6

The following graph shows the correct wiring for connecting un-
balanced signals to the balanced XLR connectors.

VERY IMPORTANT

Phantom power must be switched off before unbalanced signals
are connected! Otherwise short circuits cause damages!

Built around a torroidal transformer, the power supply allows for a
minimal electromagnetic field with no hum or mechanical noise.

The supply voltage can be set to 230 V/50 Hz or 115 V/60 Hz.

Check your country's power requirements for the appropriate
setting. An AC power cord is included to feed the IEC-spec, 3-
prong connector. Transformer, AC cord and IEC-receptacle are
VDE, UL and CSA approved. The main fuses are rated at 315mA
(230 V) and 500 mA (115 V).

Chassis ground and AC ground can be physically disconnected

by the “Ground Lift” switch (GND LIFT). This helps to eliminate
hums.The power supply's output side is filtered by an RC circuit to
extract noise and hums caused by your power service. 6000µf
capacitors smooth out the positive and negative half waves.

The phantom power is derived from a separate winding in the

transformer. Filtered and rectified by a series of zener diodes and
transistors, a clean 48 volts leaves the circuitry.This supply voltage
reaches the phantom power switch through the PCB where
another RC circuit stabilises the supply again. Our high quality
0.1% / 6,81 kOhm resistors ensure the pristine quality of the
phantom power supply.

A stable, low ripple torroidal power
supply is the foundation for any
high-fidelity sound shaping.

The GND-LIFT switch helps 
eliminate hums caused by 
ground loops.

Phantom Power with a complex
filtering scheme and highly
selected components.

Power Supply

Содержание GoldMike 9844

Страница 1: ...Model 9844 Manual Vacuum Tube Microphone Preamplifier ...

Страница 2: ...ion of SPL Limitations of Liability In no event will SPL be liable for any damages including loss of data lost profits cost of cover or other special incidental consequen tial or indirect damages arising from the use of the unit however caused and on any theory of liability This limitation will apply even if SPL or an authorised dealer has been advised of the possibility of such damage SPL electro...

Страница 3: ...often tested and compared in many publica tions and by our customers themselfs and constantly valued with best results I would like to pass on this broad appreciation to those who deserve it my excellent colleagues Hermann Gier Dear customer Thank you for the confidence you have shown towards SPL electronics GmbH by purchasing the SPL GoldMike You have decided to use an innovative microphone pream...

Страница 4: ...e experience of more than 12 years of research in semi conductor amplification design The GoldMike allows for up to 72 dB of gain a value tube only designed preamps can t match The SPL tube IC construction on the other hand superbly combines today s standards with such trademark tube characteristics improved spatial depth rich detailed imaging warm and smooth sonics Moreover the GoldMike delivers ...

Страница 5: ...ug the unit Please unplug the cable by pulling on the plug only never pull on the cable Never force a switch or knob To clean the case use a lint free cloth Avoid cleaning agents as they may damage the chassis Manufactured in standard 19 EIA format it utilises two rack units Please support the back of the unit whenever it is being mounted into a 19 rack especially important when touring Again whil...

Страница 6: ...can be physically disconnected by the Ground Lift switch GND LIFT This helps to eliminate hums The power supply s output side is filtered by an RC circuit to extract noise and hums caused by your power service 6000µf capacitors smooth out the positive and negative half waves The phantom power is derived from a separate winding in the transformer Filtered and rectified by a series of zener diodes a...

Страница 7: ...ge and then maximises the warmth and liveliness of a meticulously selected and tested ECC 83 tube at the second stage This makes the GoldMike an ideal partner for high end HD recording The unit s dynamic range of 111 dBu even outperforms some 24 bit recording gear Advantages of the dual mono design GoldMike s two mono amplifier blocks are designed with a central power supply that utilises a star g...

Страница 8: ...ed shelving bandpass neverthe less a shifted timebase phase is responsible for boosting the harmonic content The close correlation however between frequency and amplitude timebase to the dynamics of the input signal remains intact When working on a hard disc recording system you will greatly appreciate the appeal of the Flair circuitry and the topnotch sounding signal it delivers It can spare you ...

Страница 9: ... 3 When turning on the supply voltage a phantom circuit is generated by splitting the 48 volt supply signal equally between the and conductors of the audio cabling the voltage is returned through the cable s shield No potential difference is present between the two conductors dynamic microphones may be used while phantom power is switched on without damage Phantom power in effect reduces the inter...

Страница 10: ...phone wiring scheme GoldMike s XLR connectors are configured as follows pin 2 high pin 3 low 3 Experimenting with the phase reverse option may reward you with better results The PAD switch attenuates the input signal by 30 dB allowing even high level signals to be processed by the GoldMike This may apply to loud drum or brass recordings The HIGHPASS filter will pass only frequencies above a certai...

Страница 11: ... during the tube amplification stage The resulting recorded signal resounds with more detail intelli gibility presence and cut through The FLAIR circuitry is especi ally valuable when working in an HD recording environment because of the great sounding signal it delivers at the outset thereby sparing you hours of fixing a compromised recording Each of the GoldMike s channels is equipped with a bac...

Страница 12: ...ormerless Input Impedance 1 8 kOhm Max Input Level 25 72 dBu Outputs XLR Output Microphone Instrument Preamplifier electronically balanced differential transformerless Nominal Output Level XLR 6 dB Max Output Level XLR 25 4 dB Nominal Output Level 1 4 0 dB Max Output Level 1 4 19 4 dB Output Impedance XLR Klinke 600 Ohm Dimensions Standard EIA 19 1HE chassis 19 x 3 47 x 6 18 482 x 88 x 157mm Weigh...

Страница 13: ...uthorized SPL warranty repair facility in the country where purchased or to the SPL factory in Germany in the original packaging or a replacement supplied by SPL with all transportation costs and full insurance paid each way by the purchaser or owner All remedies and the measure of damages are limited to the above services It is possible that economic loss or injury to person or property may resul...

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