ETO Ehrhorn Technological Operations ALPHA 374 Amplifier
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1.1 GENERAL DESCRIPTION
The ALPHA 3?4 is a high power linear Amplifier
major advances in engineering and construction. It is rated
for continuous service at maximum legal amateur power (FCC
r u l e s ) in SSB, CW, FSK, and SSTV inodes.
Exceptional power capability is achieved in combination with
uniquely compact size and modest weight, through employment
of a variety of advanced components including state-of-the-art
Eimac ceramic/metal tubes, a power transformer with core of
tape-wound, grain-oriented silicon steel (Hipersil®), and
ETO's exclusive ducted-air full cabinet cooling system.
The ALPHA 374
is capable of delivering normal power output,
into a reasonably well-matched load, across all amateur bands
for 80 through 10 meters without manual tuning adjustments.
In addition, available manual controls also permit operation
on out-of-band MARS and other special frequencies from 3*5 "to
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2014 04 27
SECTI0N 1-1.1 GENERAL DESCRIPTION ... .la
1.2 SPECIFICATIONS AND RATINGS ... la
SECTION 2 - INSTALLATION
2.1 UNPACKING ... 2a
2.2 TRANSFORMER INSTALLATION ... 2a
2.3 ELECTRICAL INSTALLATION ... 2"b
SECTION 3 - OPERATION
3.1 CONTROL FUNCTIONS ... .3a
3.2 INITIAL Amplifier
ADJUSTMENT ... 3e
3.4 FINAL ADJUSTMENTS, BANDPASS TUNING . . 3g
3.5 OVERLOAD PROTECTIVE FUNCTIONS ... 3h
3.6 REDUCING EXCITER OUTPUT ... 3h
SECTION 4 - MAINTENANCE AND TROUBLESHOOTING ... 4a
SECTION 5 - THEORY OF OPERATION ... 5a
SECTION 6 - SCHEMATICS AND ILLUSTRATIONS ... 6a
SECTION ? - PARTS L I S T ... 7a
AMATEUR RADIO PRODUCTS WARRANTY ... Inside Rear Cover