Administrative Communication Systems
FEATURES
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250 W Output Power
Front-Panel LEDs: Output Signal Level,
Temperature and Overload Indicators
Temperature and Overload Projection
Wide Frequency Response 20 to 20,000 Hz± 1 dB
Low Distortion and Noise Levels
Transformer Outputs: 4 , 8 , 25 V and 70 V
Switchable Input Sensitivity: Balanced /
Unbalanced Configuration
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DESCRIPTION
The Telecor model TEL-250 Amplifier delivers up to
250 W of power at less than 0.5% total harmonic
distortion with a frequency response of 20 to 20,000
Hz ± 1 dB. The device is designed for dependable
continuous operation. Elaborate protection circuitry is
implemented in the design, to ensure maximum
protection from damage caused by overloads and
shorted line conditions.
ARCHITECT’S & ENGINEER’S
SPECIFICATIONS
FRONT PANEL INDICATORS
Rear panel input terminals can accommodate both a
balanced input signal source or a single-ended input
signal source connection to the amplifier. A 0 dBv (1
V) or a -20 dBv (100mV) input signal level can be
selected with a sensitivity switch.
Barrier strips are used for input/output connections.
This provides more secure wiring terminations and
greater current handling capabilities than typical
phone jacks or binding posts.
The amplifier is provided with a recessed adjustable
input attenuator. To prevent casual tampering, the
control must be adjusted by means of a screwdriver.
A plastic cap is supplied for added security.
Current limiting protection is activated whenever the
amplifier is overloaded. Current will be limited to the
speaker load, and an LED will light, if the amplifier is
overdriven, connected to an excessive load or short
circuited.
The Amplifier shall be a Telecor model TEL-250 or
approved equal. The amplifier shall deliver an audio
output of 250 W RMS at less than 0.05% harmonic
distortion. Hum and noise levels shall be more than 80
dB below rated output. Frequency response shall be
40 - 15,000 Hz ± 1 dB. Frequency response shall be
20 - 20,000 Hz ± 1 dB when used with the optional T2
extended range output transformer.
The amplifier shall be provided with both 600
balanced and 10k unbalanced inputs. The input
sensitivity shall be selectable between 100 mV or 1V
by means of a rear panel selector switch. A “low cut”
switch shall be provided on the rear panel to attenuate
low frequency signals below 100 Hz. The output shall
be transformer isolated, with 4 , 8 , 25 V and 70 V
constant voltage taps.
The input level shall be adjustable by means of an
input attenuator. The attenuator shall be recessed and
shall be adjusted by means of a screwdriver, thereby
avoiding casual or accidental setting changes. A
security cover for the attenuator shall also be
provided.
The amplifier shall incorporate a 27 dB range VU
meter, with 10 LEDs providing a 3 dB resolution scale
in the display. A “clip” indicator shall be employed to
indicate excessive input levels or an overloaded
output condition.
A thermal sensor detects excessive heat build-ups at
the heat sink and automatically shuts the amplifier
down, if necessary, to prevent damage to internal
components. A warning LED lights in the event of an
unusual temperature rise.
A calibrated LED level meter indicates the amount of
signal present in 3 dB steps, from - 30 dB to -3 dB.
The “clip” LED lights whenever the output stage is
about to clip from either an overdriven input or an
overloaded output.
TEL-250
250 Watt Amplifier
INPUT ATTENUATOR
The amplifier shall incorporate current limiting
protection circuitry that activates whenever the
amplifier is overloaded by overdriving, by connection
to an excessive load or by a short circuit, limiting
current to the speaker load. An LED shall be provided
to indicate the presence of an overload condition.
Output configurations are available for 4 or 8
speakers, as well as 25 V or 70 V constant voltage
lines.
(continued)
Thermal sensors shall be employed to detect an
excessive heat build-up and shall automatically shut
the amplifier down to prevent any damage to internal
components. The heat sink temperature shall be
monitored. A warning LED shall light in the event of an
unusual temperature rise.
The amplifier shall use barrier strips for all input/output
connections to provide optimum wiring and currenthandling terminations.
TEL- 250 SPECIFICATIONS
OPTIONAL ACCESSORIES
Output Power:
Freq. Response:
T2-250 Extended range output transformer to extend
frequency response to 20-20,000 Hz ± 1 dB
Total Harmonic
Distortion:
Input Sensitivity
(switchable):
Input Impedance
configuration
(switchable):
Outputs
(balanced):
Controls:
Indicators:
Connectors
Inputs:
Outputs:
AC Power Cord:
Power Input:
Power Consumption:
Dimensions:
Weight:
250 W RMS
(T1) 40-15,000 Hz± 1 dB
(T2) 20-20,000 Hz ± 1 dB
0.05% @ 1kHz
100mV / 1000mV
10 k
600
All product information and specifications subject to
change without notice.
- unbalanced
- balanced
4 , 8 , 25 V and 70 V
1 input gain control
1 input sensitivity switch
1 low cut switch
1 On/Off power switch
Power On/Off
Output level(LED VU meter)
High Temperature (LED)
Current Overload (LED)
screw terminal strips
screw terminal strips
SJT 3 Cond, U-ground
120 VAC, 60 Hz
470 W
4.8" H x 17.0" W x 13.0" D
28 lbs
In the USA: 165 Kirkland Circle; Oswego, Illinois; 60543; Phone: (630) 236-8400 Fax: (630) 978-2201
2434 Jerauld Avenue, Niagara Falls, NY, 14305. Phone: (716) 285-8272 Fax: (716) 285-8287
In Canada: 1114 Westport Cr., Mississauga, Ontario, L5T 1G1. Phone: (905) 564-0801 Fax: (905) 564-0806
In the UK: Unit 3a, 21 Coopers Court, Coopers Yard, Newport Pagnell; Milton Keynes MK16 8JS; Buckinghamshire Phone: (0)-1908-211782 Fax: (0)-1908-216946
ETS-1120
T2-C37.WP/BT
Printed in Canada