Heathkit SB-1000 - Installation; Power Considerations

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INSTALLATION
LOCATION
Do not operate the Amplifier in excessively warm
locations or near heating vents or radiators. Be sure
air can circulate freely around and through the
Amplifier cabinet, and can provide an unobstructed
air inlet for the blower. Do not place any books,
magazines, or equipment that will impede the free
flow of air near the sides of the cabinet.
The internal fan allows an air flow that is greater
than 50 CFM. Do not use an external fan with your
Amplifier, unless it exceeds this CFM rating by a
factor of 2:1.
The exhaust air becomes quite warm at high power
levels. Do not position any heat-sensitive objects in
the exhaust air stream.
POWER CONSIDERATIONS
Due to the power involved, this Amplifier should
have its own 240 VAC electric service line. This line
should have three 12-gauge conductors, and 10-
ampere fuses in each “hot” wire. If a single 240 VAC
line must serve the entire station, however, make an
effort to connect your equipment so the load is
balanced between the two "hot" wires as nearly as
possible.
[f you have only 120 VAC available, use a separate
line made up of 10-gauge conductors and 20-ampere
fuses.
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DO NOT use this Amplifier at its full ratings on a
regular house wiring circuit, as the ratings of the
wire will almost certainly be exceeded.
Avoid excessively long runs of wire between your
service entrance and the Amplifier. A heavy flow of
current in such a line results in a voltage drop which
can affect the performance of your equipment.
The plug on the power cord of your Amplifier is for
standard 120 VAC outlets. For 240 VAC operation in
the US.A., cut off and replace the plug with a
permanent plug that matches your 240 VAC _recep-
tacle so that your power connection conforms with
section 210-21 (b) of the National Electric Code,
which reads, in part:
“Receptacles connected to circuits having differ-
ent voltage, frequencies, or types of current (AC
or DC) on the same premises shall be of such
design that attachment plugs used on such cir-
cuits are not interchangeable."
When you install the new plug, make sure it is
connected according to your local electrical code.
Keep in mind that the green line cord wire is
connected to the Amplifier chassis.
For your convenience in identifying conductors, one
conductor is black and the other is white.