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5.6 ALWAYS THINK - SAFETY
THIS LINEAR AMPLIFIER DESCRIBED IN THIS MANUAL CONTAINS VOLTAGE HAZARDOUS TO
HUMAN LIFE AND SAFETY WHICH IS CAPABLE OF INFLICTING PERSONAL INJURY. NEVER
OPERATE THE AMPLIFIER WITH THE TOP COVER REMOVED AND THE TOP COVER SAFETY
SWITCH DEFEATED. BEFORE REMOVING THE TOP COVER MAKE SURE THE AC LINE POWER
CORD HAS BEEN DISCONNECTED FROM THE AC POWER SOURCE. ALLOW A MINIMUM OF 5
MINUTES TO ELAPSE BEFORE REMOVING THE TOP COVER AFTER POWER HAS BEEN
REMOVED. THIS IS NECESSARY TO ALLOW THE PLATE VOLTAGE FILTER CAPACITORS TO
BLEED DOWN TO A SAFE LEVEL.
Before operating this unit ensure that the protection conductor (green/yellow wire) is
connected to the ground (earth) protective conductor of the power outlet. Do not defeat the
protective features of the third protective conductor in the power cord by using a two
conductor extension cord or a three-prong/two-prong adapter.
Before operating this unit:
1. Ensure that the instrument is configured to operate on the voltage available at the power
source. (See Installation Section)
2. Ensure that the proper fuses are in place in the amplifier's AC line fuse holders located
on the rear panel.
3. Ensure that all other devices connected to or in proximity to this amplifier are properly
grounded or connected to the protective third-wire earth ground.
If at any time the amplifier shows visible damage, has sustained stress, emits a foul smell,
fails to operate satisfactorily, it should not be used until its performance has been checked
by qualified service personnel.
Connect a good earth or water pipe ground to the ground post on the rear of the Amplifier. Use
the heaviest and shortest connection possible. Before you use a water pipe ground, inspect the
connections around your water meter and make sure that no plastic or rubber hose
connections are used. These connections interrupt the continuity to the water supply line.
Install a jumper around any insulating water connectors you may find. Use heavy copper wire
and pipe clamps.
It is best to ground all equipment to one point at the operating position and then ground this
point as described above.
5.7 SAFETY INTERLOCK SWITCH
While the Amplifier's top cover is in place, the interlock switch closes to allow AC line voltage to reach
the power transformer. When the top cover is removed, the interlock switch opens and disconnects the
line voltage. This does not discharge the bank of power supply filter capacitors. Be sure to allow the
filter capacitors to discharge before you touch anything inside the Amplifier. You can select the High
Voltage function of the Multimeter to check the high voltage potential.
