Equipment information
ETO Ehrhorn Technological Operations ALPHA 77Sx Amplifier
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Model:
ALPHA 77Sx
Date:
1990
Category:
Group:
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.
Manual Type:
Service and User Manual
Pages:
40
Size:
1.29 Mbytes (1350229 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
2014 04 27
MD5:
0fca9201e38d86a46ec2c70a73acd9b4
Downloads:
1839
Information
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