IMPORTANT
CRITICAL PRECAUTION DURING INSTALLATION OF YOUR ETO 31/?!
While the cover is removed to install the power transformer, make sure that the tubes are
properly installed as described in Section 2 below. Failure to do this may cause severe damî
age or destruction of both tubes. Such damage is not covered under warranty.
CAUTION: Only the screws securing the 91/3 top cover and front panel have ENGLISH
threads (6-32 or 8-32). ALL OTHER HARDWARE IS METRIC DO NOT REPLACE
TRANSFORMER OR OTHER SCREWS WITH ENGLISH SIZES, as doing so will damage
the captive nuts installed in the chassis.
Section 1
INTRODUCTION
General Description of the ETO 91fi Amplifier
The ETO 91/3 is a self-contained, HF linear power amplifier capable of continuous operation
at 1500 watts peak power output on SSB, keyed CW, SSTV, RTTY, digital modes or AM, with
no time limit. If periods of "con tinuous-key-dcrwn" carrier operation will exceed 5 minutes, the
optional auxiliary cooling fan available from ETO must be installed to avoid possible damage not
covered by the warranty.
As shipped, units delivered within the USA and its territories are manually tunable to cover
all HF amateur bands from 1.8 to 14.35 MHz, with extensive out-of-band capability for
operation on MARS, etc. Appropriately-licensed users may contact ETO for information
on modifying domestic amplifiers to extend coverage to 29.7 MHz.
Specifications, ETO 91fi
Frequency Coverage: U.S. units only, amateur bands 1.8-14.35 MHz as shipped (see note
above); export units, 1.8-29.7 MHz.
Power Output 1500 watts peak all modes, including SSB, CW and continuous or modulated
carrier. Carrier operation (eg., AO, RTTY or FM) for more than 5 minutes at or near maxiî
mum rated power requires use of the auxiliary cooling fan accessory.
Drive Power 50 to 60 watts nominal for rated output.
Power Gain: Nominally 14 dB, a power increase of 25 times.
Input Impedance: 50 ohms nominal, unbalanced; VSWR <1.5:1.
1
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