DOCNUMBER 9500
Document Issue 1, Revision 7
June 2009 Page 4–5
Alpha Radio Products Alpha 9500 HF Linear Amplifier Operating Manual
Product Release 1 Preparing Your Station
If your line voltage is below 110 V under load, do not expect to be able
to get 1500 W output (see
Table 4-1).
Table 4-1 Amplifier behavior with nonstandard line voltages
Line voltage Expected behavior
Low: 90–110 V Power outputs above 1000 W are not expected.
Normal: 110–130 V 1500 W PEP operation (CW or SSB) may be
po
ssible if your AC line service has sufficient
current capacity (30-A circuit recommended).
However, 1500 W continuous should not be
expected.
High: >250 V Lifetime of the tubes may be reduced. Ask your
u
tility company if they can reduce your line
voltage. If this is not possible, consider placing
your own step-down transformer in line between
the AC outlet and the amplifier. A transformer
with at least 4-kVA rating is required, due to the
nature of the current waveform in the primary.
Another choice for voltage control, a ferroresonant
voltage regulator, is an expensive solution, but is a
good way to stabilize primary voltage.
NOTE If you intend to operate the amplifier at ~120 V or if other equipment
draws current from the same circuit as the amplifier, the following
apply:
1. If you replace the factory-shipped 20 A/250 V fuses with 25 A/250
V “slo-
blo” fuses (for line voltages of less than 100 V), be aware
that the higher current at the lower voltage significantly warms the
amplifier’s power cord. The cord (as well as fuse holders and
some internal connectors) are operating near their maximum
ratings due to the current demand at lower voltages.
2. Ensure that the AC cord is not coiled too tightly or placed where
no
rmal air flow is restricted, causing it to overheat.
3. You must change the two lower 2A fuses on the rear panel to 5A
fuses to
allow for the increased in-rush current.
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