ATI Technologies L1000 Guía de instalación
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www. audio.com
© Copyright 1997-2007, Audio Technologies Incorporated - Printed in USA
L1000
DUAL LINE AMPLIFIERS
OPERATION AND MAINTENANCE MANNUAL
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www. audio.com
DESCRIPTION
The IC’s that were developed primarily for the instrumentation market had many
shortcomings when used in high quality audio applications. The lack of audio
related specifications, crossover distortion, high noise for low source
impedances, limited output capability and limited gain bandwidth product forced
many compromises when used in high gain audio systems. High ratio input
transformers, output boost stages and multiple stage designs were all used to
compensate for op amp deficiencies and in turn added additional response and
distortion problems of their own.
Walter Jung, in a definitive series of articles, analyzed and defined slew rate
induced distortion mechanisms, tested many commonly available ICs and
correlated various distortion tests with subjective (listening) criteria. A very
significant result of his efforts was the identification of an IC originally developed
for the European professional audio market which has almost ideal
characteristics for audio use and in particular provides a symmetrical high slew
rate capability of 13 volts/microsecond, virtually eliminating slew induced
Transient Intermodulation Distortion. By contrast the old standard 741-op amp
has a slew rate of only .6V/microsecond.
This op amp is now available from several U.S. Manufacturers in single and dual
versions and forms the basis for our designs. This chip incorporates a low noise
input stage designed for excellent noise performance even with low source
impedances and eliminates the necessity for touchy high ratio input step up
transformers in the M1000. High output, capable of driving 600 ohm loads
directly to +22dBm, with total freedom from crossover distortion, high inherent
linearity, 100dB open loop gain and 50 MHz gain bandwidth product make this an
ideal device for highest quality audio. The absence of Transient Intermodulation
Distortion may be detected by the smooth effortless high frequency output
capability, the absence of the harsh, raspy sound typical of IC amplifiers driven to
full output at high frequencies and the freedom from increasing harmonic
distortion vs. frequency. As used in the amplifiers, a minimum of 40dB of loop
gain is available for 100: 1 distortion reduction even at 20kHz.
The high output swing capability allows the amplifier to use a simple, low
distortion, flat response, 1 - 1 output transformer. ATI provides two models of
each; Transformer balanced outputs (with faraday interwinding shields) for high
RF field environments, and an active balanced output version (bridge circuit) for
low RF environments where balanced output lines are required for hum rejection.
Inaudible crosstalk characteristics allow use for either stereo or dual monaural
applications. Dual gain controls are provided to facilitate either mode of
operation.
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www. audio.com
Our power supply incorporates a couple of unique regulating devices called
zener diodes. In contrast to most fancy three terminal IC regulators, these
devices will live through line transients and simultaneously protect your circuitry.
INSTALLATION
MOUNTING
Your amplifier may be desk mounted on its non-slip suction cup feet or you can
stack the amplifiers on top of each other. Rack mount system 21075-501 mounts
two units in one rack
WIRING
Our insurance company insists on three wire grounded plugs. The third wire
ground can cause a ground loop with your station ground. If you are sure your
station ground will provide adequate protection to personnel in case of an AC line
short to the chassis, a 3 to 2 AC line adapter can be used to isolate the power
line ground. We recommend that the adapter be removed and the power line
ground reconnected prior to any service work requiring removal of the station
ground connection from the chassis.
The four inch copper strap which you are, of course, using for your station
ground is not going to fit around the #6 chassis ground screw on the rear panel.
Run strap to within a few inches of the chassis and jump to the chassis ground
with shield braid.
Line inputs are connected to the rear screw terminal strip following the rear label
designations. G1 is the CH1/Left Ground, G2 is the CH2/Right ground. If
grounding input and output shields at the MICRO"P, use the proper ground for
each channel.
The L1000 will accept input audio to +24dBm bridging (12.5 Vrms). Inputs are
protected by clamping diodes for signal swings exceeding ±41 Vp-P.
Output wiring is indicated on the rear panel label. H1 outputs are in phase with
each other and with the input signal.
Transformer Output MSCROAMPS (L1000-1) may have either HI or LO outputs
grounded (but not both).
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www. audio.com
ADJUSTMENTS
The amplifier has sufficient gain and output capability to overdrive some console
inputs, particularly those providing preamps for high-level input channels. A -1
0dBm line input will provide +8dBm output from the amplifier with the gain pot to
approximately 2 o'clock. 12 o'clock is approximately 0dBm output and 10 o'clock
is -10dBm output (unity gain).
The common mode adjustment pots R1 6 and R35 are factory set to an 80dB null
at 60Hz If disturbed, they can be readjusted by applying a common mode 60Hz
input to HI & LO input together referenced to ground and renulling R16 for CH
1/L and R35 for CH 2/R. The null drops to 40dB at 20kHz due to slightly unequal;
roll offs in the input RF bypass capacitors.
MAINTENANCE NOTES
Power supply voltages are +/- 18VDC nominal, dropping to +/- 16VDC under full
output. If zeners are replaced, remove Al, A2, and A3 ICs and check output
voltage before plugging ICs back into the circuit. Remove power when inserting
or removing ICs.
IC output DC voltages (no signal conditions) should measure OVDC +/- .5VDC.
Significant deviation indicates IC or circuit problem. Measurable DC difference
between +/- amplifier inputs (other than due to meter loading) indicates IC failure.
MODIFICATIONS - 230 VAC OPERATIONS
Your L1000 is wired for 115 VAC 50/60 Hz operations unless otherwise
requested at the time of ordering. It can be modified for 230 VAC use by
removing the Power transformer primary jumpers W1 and W3 and inserting a
jumper in the W2 holes.
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www. audio.com
PERFORMANCE SPECIFICATIONS
OUTPUT CLIPPING LEVEL +22dBm /600 ohms
DISTORTION @ +20dBrn output and input levels to +24dBm
FREQUENCY RESPONSE +/-.25dB, 50 to 20,000 Hz -1 dB at 20 Hz
.2% maximum THD, 30 to 20,000 Hz
INPUT IMPEDANCE Balanced differential inputs, 30,000 ohm
bridging
EQUIVALENT INPUT NOISE 3.5 Microvolts
20kHz measurement bandwidth
600 ohm source impedance
HUM REJECTION 80dB for common mode hum
INPUT OVERLOAD +24dBrn bridging 600 ohms
GAIN 34dB, front panel adjustable
POWER 115/230VAC +/- 10%, 47-63Hz
SIZE 8-1/2" W x 1-3/4" H x 7" D, 2-1/2 lbs.
MOUNTING Suction feet for non-slip desk mounting. Rack
mount system 21075-501 mounts two units in
one rack
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