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100 Watts of Output Power at Less than 1% THD from
35
Hz to 20 kHz
Transformer-Isolated Outputs for
for 25V and 70.7V Distribution Systems
Switchable Highpass Filter Protects Driver Loudspeaker
from Excessive Low-Frequency Power Demands
Exclusive Active Dissipation Sensing Circuit Protects
Output Transistors
AC
or Battery Operation
.
.
.
NOTICE
Read this manual before operating
the AI-TEC 15948 Power Amplifier.
. .
FEATURES
Automatic Transfer to Battery Operat~on if AC Power
Fails
and 16 Ohms and
Low Power Consumption
Low Heat Generation
Hinged Front Panel for Easy'Maintenance
Small Size
Light Weight
POWER AMPLIFIER
OPERATING
INSTRUCTIONS
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Summary of Contents for Altec 1594B
- Page 1 POWER AMPLIFIER OPERATING INSTRUCTIONS NOTICE Read this manual before operating the AI-TEC 15948 Power Amplifier. FEATURES 100 Watts of Output Power at Less than 1% THD from Automatic Transfer to Battery Operat~on if AC Power Hz to 20 kHz Fails Transformer-Isolated Outputs for and 16 Ohms and Low Power Consumption...
-
Page 2: Specifications
DATA CONTENTS Page Graphics Page SPECIFICATIONS Figure 1. Typical Power Output Versus Fre- quency for 0.5% THD and 1% THD DESCRIPTION (8-Ohm Load) Figure Typical Frequency Response Characteristics INSTALLATION Figure 3. Typical % THD Versus Frequency RACK INSTALLATION for 100-Watt Output SHELF INSTALLATION VENTILATION Figure 4. - Page 3 Up t o 5 5 ' ~ (131°F) ambient Dimensions Weight: 35 pounds, ounces Color: ALTEC green ALTEC 15095A Line Transformer Accessories: ALTEC 15335A Line Transformer ALTEC 42526 Shelf Mount Cover ACCESSORIES MUST BE ORDERED Figure Typical % THD Versus Wattage Output at 1000 SEPARATELY...
- Page 4 sturdy enough t o support lightweight equipment placed on DESCRIPTION Four polyethylene feet prevent marring of sur- The A L T E C 15948 Power Amplifier delivers u p t o faces. The A L T E C green finish matches the front panel o f the 15948.
- Page 5 must be ventilated to prevent an excessive temperalure rise. 1 t o 2 and 3 to on TB3). The power input nameplate, Because transistors are heat sensitive, the 15948 should not adjacent to the power cord on the chassis, i s mounted t o be placed adjacent t o heat-generating equipment or in areas show the appropriate side specifying the connections (see where ambient temperature exceeds 5 5 ' ~ ( 1 3 1 ' ~ ) .
- Page 6 For transformer-isolated input, a plug-in 15095A or 15335A Line Transformer must be plugged into receptacle J1 (see Figure 6). The input leads connected t o terminals 3 and 4 of the INPUT terminal board. When shipped from the factory, pins 3 and 4 of J1 are strapped together t o provide 600-ohm input.
- Page 7 Step 3. chassis interior. R137 fully clockwise (see Figure I f the ALTEC 42526 Shelf Mount Cover accessory is in- Turn on power and allow a 5-minute warmup stalled, remove by reversing the steps of the cover installa- Step 4.
- Page 8 Step Adjust R136 and R137 by one of the following Step 4. Carefully insert new or repaired power driver methods [method (a) i s preferred] : PCB into connector. Do not warp, bend or twist the board or conductor may fracture. Locate wire attached to terminal 1 of output transformer T2.
- Page 9 and 3 show normal function, connect Step 4. I f Steps I f component is faulty or damaged, clip leads close to ohmmeter leads to collector and emitter. Read component and then unsolder leads from board. With- on lowest ohms scale. Reverse leads and read draw leads from component side.
- Page 10 :I; I I > ? POWER DRIVE? PCB ASSEI'.'BLY ( A l ! , t i I ' ! I N LOWERED POSITION 1 1 3 Figure Component Locations Inside Main Chassis VOLTAGE RATING PLATE Figure 11. Component Locations on Rear of Chassis...
- Page 13 PARTS Reference Ordering Name and Reference Ordering Name and Designator Number Designator Number Description 27-01-042843-04 PCB Assembly, Power Driver Transistor, 2N5305, selected Transistor, 2N2712, selected Transistor, 2N3906. selected Transistor, 2N5308, low noise, selected Cap.. 7000 pF, 40V 48-03-107447-02 Transistor. 2N5320, 400V Pot., 1 5 K a 220% Cap., 220 pF +lo%,...
- Page 14 PARTS LIST (continued) Reference Reference Ordering Name and Designator Number Description Designator Number Description R113 47 11-102177-01 Res., 15KC?,+10%, Res., 47Q 1 /4W 47-01-102155.01 114W R115.117 Pot., 5 0 n 2 0 % , R116 Pot., 10a, 2 2 W R118.119 Res., 1 Ka+10%, Switch, DPDT, slide...
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