avoid this situation, select one ground path from a
group of instruments connected together, and permit
no other ground path
the power line ground.
Grounding one of the instruments may give less ripple
trouble than grounding any other; or ungrounding all
instruments may give lowest line-frequency modu-
lation of the desired signal.
2-8. POWER CABLE. The plug on the power cable
has a round grounding terminal combined with stand-
ard, 2-prong plug.
the ac outlet will not accommodate
this plug, an adapter must be used. The round pin on
this plug grounds the amplifier chassis.
adapter is used, the chassis connection is a pigtail
lead extending from the adapter, which should becon-
a grounded ac outlet mounting box
2-9. POWER LINE VOLTAGE. The
shipped from the factory for operation on 11S-volt
ac power, unless otherwise specified.
transformer can be reconnected for use on 230-volt
power by connecting its dual primary windings in
series as shown on the schematic diagram, note 1.
After such conversion, replace the 0.8-ampere fuse
with an 0.4-ampere slow-blow fuse.
2-11. The only operating precaution
mind are the instructions in paragraphs 2-S and 2-6
regarding excessive dc voltages.
For operation in
conditions, provide any
physical protection possible to prevent mechanical
damage, and operate amplifier as usual.
obstruct ventilating louvers. The power cord may be
left connected to the power source during periods of