User's Manual
25
ALPHA 9500 Interim OPERATING MANUAL
www.alpharadioproducts.com
4.3 AC Primary Connections
When the Alpha 9500 is powered on, the line voltage is measured and the appropriate tap setting
is chosen and set. The amplier does not reset the tap as long as it is powered up.
Below are some considerations at the high end and the low end of this voltage range that are
rarely encountered.
Low Voltage vs. Power Output
At the low end of the voltage range, do not expect to be able to get 1,500 watts output if your
line voltage is below 110 volts. If your line voltage is between 110 and 130 volts, then 1,500 watts
PEP operation (CW or SSB) may be possible if your AC line service has sufficient current capacity
(30 amp circuit recommended). However, 1,500 watts continuous should not be expected. If
your line voltage is between 90-110 volts, then power outputs above 1,000 watts should not be
expected from the amplifier. Tune (adjust) the amplifier for no more than 1,000 watts output, and
simultaneously for maximum efficiency.
Low Voltage vs. Current Draw
If your amplifier runs on 120V, be aware that it is normally shipped fused with 20A/250V fuses.
You may want to consider replacing these with 25A/250V “slo-blo” fuses for very low line
Interlock
Transformer AC
Connector
Crowbar
RF Choke
Blower
Tube
Power Supply
Mains Board
Tank coil
Band switch
Figure 4.3
External Fan