ETO Ehrhorn Technological Operations ALPHA 77Dx Amplifier
Manufacturer:
Model:
ALPHA 77Dx
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.

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Service and User Manual
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:
1835

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

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