Related Manuals for Universal Audio LA-610
Summary of Contents for Universal Audio LA-610
- Page 1 Model LA-610 Channel Strip Universal Audio Manual Number 65-0901 Revision 1.1 Universal Audio, Inc. www.uaudio.com (866) 823-1176 Toll Free (877) 698-2834 Toll Free Customer Service (831) 466-3737 voice (831) 466-3775 fax...
- Page 2 In addition, the LA-610 has a line level input for use as a dedicate compressor with or without EQ and tube saturation. In addition to the LA-610, Universal Audio has released reproductions of the classic Teletronix LA-2A Leveling Amplifier and 1176LN Limiter as well as the 610 tube preamp and 2108 microphone preamplifier, which is based on the 1108 line amps that were used in my father’s studios.
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Page 3: Important Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS Before using this unit, be sure to carefully read the applicable items of these operating instructions and the safety suggestions. Afterwards keep them handy for future reference. Take special care to follow the warnings indicated on the unit, as well as in the operating instructions. Water and Moisture –... - Page 4 Audio, Inc. makes no warranties of any kind with regard to this manual, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Universal Audio, Inc. shall not be liable for errors contained herein or direct, indirect, special, incidental, or consequential damages in connection with the furnishing, performance, or use of this material.
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Page 5: Table Of Contents
Table Of Contents LA-610 Specifications..................1 LA-610 Operating Instructions...............2 610 Front Panel ................2 Input Select................2 Gain ..................3 Level..................3 Pad..................4 Polarity ...................4 +48 V (Phantom Power)............4 EQ Controls ................4 T4 Optical Compressor Front Panel ...........5 Peak Reduction ................5 Gain...................5 Limit/Compress .................5 Meter Function ................6 Meter Calibration...............6 Meter Function ................6 Meter Calibration...............6... -
Page 6: La-610 Specifications
LA-610 Specifications Microphone Input Impedance Selectable, 500 or 2k Balanced Line Input Impedance Hi-Z Input Impedance Selectable, 2.2M or 47k Maximum Microphone Input Level -8 dBu (2K input Imp. & 15 dB Pad in) Maximum Output Level +20 dBu (120Vac line) Internal Output Impedance Recommended Minimum Load Frequency Response... -
Page 7: La-610 Operating Instructions
LA-610 Operating Instructions The LA-610 is a vacuum-tube microphone/instrument/line preamplifier with basic EQ and an optical program dependent compressor. The main preamp circuit has two gain stages that utilize a dual-triode tube operating in a class A single-ended configuration. Variable negative feedback is applied to both of these stages to control gain, distortion, and frequency response. -
Page 8: Gain
level output, such as keyboards, sound modules and drum machines. The LA-610 may be used as a “tone box” in this configuration, offering a variety of sonic colors based on the front panel control settings. • Hi-Z: Selects the signal from the front panel, unbalanced Hi-Z 1/4”connector. This input can have an input impedance of 47K or 2.2M and is intended for bass,... - Page 9 • Frequency: This toggle switch selects the corner frequency (Hz). High: 4.5K, 7K, 10K; Low: 70, 100, 200 • Boost/Cut: This rotary switch selects the amount of boost or cut applied to the frequency “shelf.” The positive and negative numbers on the front panel denote dB values.
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Page 10: T4 Optical Compressor Front Panel
T4 Optical Compressor Front Panel (right side) This panel has the Peak Reduction, Gain, Meter Function and Compressor Mode controls. Each control is discussed in the following sections. COMP OUTPUT PEAK REDUCTION GAIN PREAMP METER COMP LIMIT T4 Optical Compressor MODE Figure 2: T4 Optical Compressor Front Panel Peak Reduction... -
Page 11: Meter Calibration
PRODUCT TO RAIN OR MOISTURE ATTENTION: POUR REDUIRE LE RISQUE DU FEU OU DE CHOC ELECTRIQUE N'EXPOSEZ PAS CE PRODUIT A LA PLUIE OU A L'CHUMIDITE' UNIVERSAL AUDIO, INC SANTA CRUZ, CALIF. USA • Figure 3: LA-610 Rear Chassis Input/Output Standard XLR input and output connectors are provided on the rear panel. -
Page 12: Voltage Select
Voltage Select The LA-610 can operate at 115 V or 230 V. To change the mode, wait 5 minutes after power down, unplug the AC power cord from the rear chassis. Remove the top cover. As shown below, the Voltage Select Cable can be plugged into one location for 115V operation or moved to the 230V Connector for 230V operation. - Page 13 Expansion Perfect amplifier Compression Output Level (dB B ) Input Level (dB B ) Figure 4 Input/output characteristics of a compressor, an expander and a perfect amplifier. In contrast to an amplifier, whose job is to present a constant gain, a compressor varies its gain in response to the level of the input signal.
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Page 14: Gain Reduction Circuits
As mentioned previously, the compression ratio is defined as the ratio of the increase of the level of the input signal to the increase in the level of the output signal. In this example, the input level is increased by 10 dB while the output level only increases 5 dB. This would be a compression ratio of 2:1. - Page 15 electro-luminescent panel. This signal controls the gain of the compressor. After the gain reduction circuit, the signal is sent through an Output Gain control and a two-stage output amplifier, followed by the output transformer. As mentioned previously, compressors are devices that vary their gain in a manner which is dependent upon the level of the input signal.
- Page 16 photo-cell resistance can not go completely to zero and hence there will always be some signal present. The T4 electro-optical device is the heart of the compressor and its gain reduction characteristics. Its unique characteristics affect the overall sound and character of the LA-610.
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Page 17: Historical Notes
– mostly of his design – that are still in regular use decades after their development. In 1999 Bill and James Putnam re-launched Universal Audio to reproduce classic analog recording equipment designed by their father and others. In a short time the company has... - Page 18 console was dismantled. Putnam’s solution was to build a mic-pre with gain control, echo send and adjustable EQ on one modular chassis using a printed circuit board. While modular consoles are commonplace today, the 610 was quite a breakthrough at the time. While the 610 was designed for practical reasons, it was aesthetic appeal that made it popular with the recording artists who frequented United and Western in the 60’s.
- Page 19 in response to the input signal level. A compressor/limiter "rides gain" like a recording engineer does by hand with the fader of a console: it keeps the volume up during softer sections and brings it down when the signal gets louder. The dynamic processing that occurs at ratios below 10 or 12 to one is generally referred to as compression;...
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Page 20: The La-2A
The LA-2A The LA-2A leveling amplifier, a tube unit with hand wired components and three simple controls, was introduced in the mid 1960s. It utilized a system of electro-luminescent optical gain control that was quite revolutionary; gain reduction was controlled by applying the audio voltage to a luminescent driver amplifier, with a second matched photoconductive cell used to control the metering section.
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