Equipment information

ETO Ehrhorn Technological Operations ALPHA 77Sx Amplifier
Manufacturer
ETO Ehrhorn Technological Operations
Model ALPHA 77Sx
Date 1990
Category: Radio, Communication
Group Amplifier
Description HIGH FREQUENCY LINEAR POWER AMPLIFIERS
Information
                                    The ALPHA 77Dx (type accepted model PA-77DF and
government/export
model PA-77Dx)* is a high power HF linear amplifier of
exceptional
quality, ruggedness, and sophisticated design. It is much
smaller
than other amplifiers of comparable capability, yet provides
greater
operational versatility, cooler operation, and a lower
acoustical
noise level than much larger and heavier units.
Unique design features of the ALPHA 7?Dx include ETO's exclusive
full-cabinet ducted air cooling system, built-in CW break-in
keying
system, frequency coverage down to 1.8 MHz, and a highly
efficient
custom power transformer using a tape-wound core of
grainoriented
silicon steel. High efficiency of operation is maintained
across the tuning range by a combination of vacuum variable
output
tuning capacitor and ETO's expertly designed mixture of
silver plated,
heavy copper tubing coils and multi-insulated, toroidal
inductors.

These manuals are available for the above equipment:

ETO Ehrhorn Technological Operations -- ALPHA 77Sx -- Service and User Manual
File name Alpha-5843-Manual-Page-1-Picture
Manual Type Service and User Manual
Pages 40
Size 1.29 Mbytes (1350229 Bytes)
Language english
Revision
Manual-ID/Number
Date January 1990
Quality Scanned document, all readable.
Upload date
MD5 0fca9201e38d86a46ec2c70a73acd9b4
Downloads 433 since 27 April 2014
Information
SECTION 1 - GENERAL DESCRIPTION & SPECIFICATIONS ......... 1
SECTION 2 - INSTALLATION ............................... 2
Electrical Installation (AC Power Wiring) . . . 2
RF and Control Connections .................. 5
SECTION 3 - OPERATION ................................. 8
Control Positions .......................... 8
Tune-up Procedure . . ...................... 9
Final Operational Adjustments «Sc Monitoring . . 11
Operating N o t e s ......... ................ 12
Troubleshooting Hints . ................... 14
SECTION 4 - THEORY OF OPERATION...................... 16
SECTION 5 - ILLUSTRATIONS........................... 21
Front Panel; Rear Panel ................... 21
Front Sub-panel; Back Side of Front Panel . . 22
RF Section, Top and Side, Covers Removed . . 23
Power Supply Section, Side and Oblique . . . . 24
Tube Deck, Underside; Circuit Board CB-2 . „ . 25
Circuit Board CB-3; Wattmeter „ . . . . . . . 26
Schematic, RF Section & Tube D e c k ......... 2?
Schematic, Power Supply & Main Chassis . . . . 28
Schematic, Front Panel .................... 29
Schematic, Circuit Board CB-2 ............. 3°
Schematic, QSK Circuit Board CB-3 ......... 31
SECTION 6 - STANDARD ELECTRICAL PARTS L I S T ............. 32
ET0/"ALPHA" PRODUCT WARRANTY ........... Outside Back Cover
Alpha-5843-Manual-Page-1-Picture
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