ETO Ehrhorn Technological Operations - ALPHA 77Dx - Amplifier
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ETO Ehrhorn Technological Operations ALPHA 77Dx
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Equipment:
ALPHA 77Dx
Date:
1990
Category:
Group:
Sub Group:
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 Amplifier 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.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
40
Size:
1.3 MB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
April 27, 2014
MD5:
0fca9201-e38d-86a4-6ec2-c70a73acd9b4
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 ection, 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
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