User`s manual

Wheatfield AudioWheatfield Audio HA-2 User's ManualHA-2 User's Manual
11/19/99 Page 3
Safety
The HA-2 is a tube headphone amplifier. As such, there are some safety precautions that
you need to observe.
!! CAUTION: HOT SURFACES. KEEP COMBUSTIBLES AWAY FROM TUBES.
DO NOT BLOCK AIR FLOW AROUND AMPLIFIER.
DANGER: TO PREVENT ELECTRIC SHOCK, DO NOT REMOVE COVER. NO
USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL.
First, the tubes are hot… really hot. The 6AS7G tube in particular is specified to operate
at up to 200° Celsius – that’s 392° Fahrenheit. If you touch the tubes when the amplifier
has been running for a while you will likely get burned.
Because of this, please, please keep small children away from the amplifier. If you have
small kids in the house, locate the amplifier out of their reach, and never leave it turned
on unattended, even for a moment.
Also, make sure that you don’t locate the amplifier near anything that could create a fire
hazard. Don’t place it near curtains, for example, or bedding, or anything else that is
flammable. Make sure that there’s nothing but air within a foot of the tubers on top of
the amplifier.
Second, there are high voltages inside the chassis of the HA-2 – really high voltages, up
to 540 Volts. Do not open the chassis of the HA-2 unless you are qualified to do so. If
you have any doubts, don’t do it – refer service to somebody that is familiar with working
on tube equipment.
Like any electronic equipment, do not operate the HA-2 near water, or in any location
where it is likely to get wet. If by some accident water or other liquid is spilled onto the
amplifier, unplug it immediately. Take it to a competent service technician and have it
checked out, dried off, and cleaned before plugging it back in.
If for some reason the fuse on the HA-2 blows, replace it only with the same type of fuse
that was originally installed. The HA-2 uses a slow-blow, 1.5A 250V, AGC-type fuse.