Ameritron AL-572
Instruction Manual
23
Tuning Procedure
Proper tuning will produce excellent output power, a clean signal, and good tube life. If the
various meter readings are different than indicated in the text, check the external amplifier
connections. Consult the manual for the exciter if necessary.
Please go through the following procedure carefully, in numerical order, until you develop a
"feel" for operating and tuning this power amplifier. Once you are used to operating this
amplifier, steps
not
marked with an asterisk (*) can be eliminated.
1. Set the AL-572 front panel switches as follows:
POWER
to
OFF
OPR-STBY to
STBY
MULTIMETER to HV
2. Plug the ac line cord into the proper voltage outlet.
*3. Place the main power switch in the "ON" position. The meter lamps should light and the
blower should start. Read the 3500 volt scale on the multimeter. It should indicate 2800
volts nominal and no more than 3000 volts.
4. With the amplifier still on "STBY", tune the exciter into a normal 50 ohm load according to
the manufacturer's instructions (solid state radios do not normally require this adjustment).
Turn the exciter drive down after tuning.
*5. Place the amplifier's "BAND" switch on the same band as the exciter. Set the "PLATE"
control and the "LOAD" control as indicated below:
CW
Frequency PLATE LOAD
1.810 3-1/2 3-1/2
3.600 2 1-1/2
7.050 6-1/2 1
10.125 4-1/2
0
14.050 8-1/2
4
18.125 8 2-1/4
21.050 9 5-1/2
24.900 8-1/4
3
28.050 9-1/2 5-3/4
PHONE (SSB)
Frequency PLATE LOAD
1.850 4 4-1/2
3.900 3-1/4 3-1/4
7.200 7 2
14.250 8-1/2
4
21.350 9-1/4
6
28.500 10
6
Summary of Contents for AL-572
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