Teac TN-400 - Features; Superior Signal-to-Noise Ratio; Only One Moving Part; Reduced Wow and Flutter

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Superior Signal-to-Noise ratio
Possible sources of undesirable noise and
rumble inciude the Power Transformer, the
Drive System, the Turntable Bearing System
and the Motor. TEAC has dramatically
reduced rumble (and other noise) in the
TN-400 to less then 60 dB by special
concentration on those areas.
a) The power transformer has a double-
cushioned nounting. It is completely
shielded and pitched to reduce hum -and
vibration.
The diseet-drive system @mploygd has
the DC serec motor connected directly
to thelggetreable gutter Ti
limiaates 4netion and V
b
b ees and pu
not e TN-400,
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c) MABE AT is 2 unique dpplication
of 3
platta is partial : =)
cons wartime
‘and 2 us mble) i
the platfiar ‘Motor shaft.
ad) T he die-sbw speed oc servomotor is
conetlay brushless, using a quiet
electrogx tommutator. Electronically
quiet, the —otor also has very little
v Srewon as it is directly coupled to the
masswe 24 kg (5 1/4 Ib.) turntable
platter.
WARRANTY REGISTRATION
To validate your warranty for this unit, fill
in the Warranty Registration and return it to
TEAC Corporation immediately. Retain
your Bill of Safe, keep it in a safe place, for
you may need it to verify the purchase date
for your warranty. Also keep the box and
packing materials. If the unit ever needs be
returned to 2 Service Station you will be
responsible for shipping damage if incurred
because of improper packing by you.
Only one moving part
Mechanical problems are almost impossible
with the TN-400 as only the Direct-Drive
Motor/Platter assembly is moving. No idlers
to wear out, no gears to grease, no levers
and no belt to replace means a long and
stable operating life. Even the turntable
support bearing (self-lubricating) has a re-
duced wear factor for the
“MAGNEFLOAT” system lifts 0.6 kg
(about 1 1/3 Ib.) of the platter weight up
from the pivot point.
Greatly reduced 0.03% wow and flutter
TWe incredible TEAC DC servomotor wes
designed for reduced wow & flutter by
inceporating 20-pole rotor-magnet/60-slot
stator cores, a 3-phase governing system,
and assuring a highly-regulated DC voltage
to the motor. Direct contact between the
motor and the massive die-cast aluminum
platter (with its inertia-mass of 325 kg-cm*)
practically eliminates any fluctuations in the
“Motor. The platter is dynamically balanced
at TEAC’s factory, also contributing to the
very undetectable 0.03% wow & flutter
characteristic.
“ELECTRO-TOUCH” control center
Lightly touch the surface of the sensitive
switches to start the turntable at the
selected speed, 33 or 45 rpm. Another
touch to the STOP “switch” will electron-
ically command the motor to cease its drive.
SERVICE
Should the equipment need repair, contact
the dealer where it was purchased, or the
authorized TEAC Service Station nearest
you. For an up-to-date listing of the Service
Stations, write to TEAC; both address and
phone number are on the back cover.
*The Warranty period is described on the
Warranty Card. Read the card for complete
details.
—3-
With no moving parts, these ELECTRO-
TOUCH switches are unique in the industry,
for they are activated without any thump or
vibration to upset the smooth performance
of the TN-400.
Special power supply design
An automatic drive-current selection and
governing method is used with a large,
cutcore transformer to prevent a decrease in
voltage when the motor starts. To bring the
rotation quickly up to rated speed requires
up to 8 times the normal current which
means a surge current of almost 800 mA is
provided without a decrease in the DC
voltage. Motor stability is further supported
by an extremely well regulated OC power
supply circuit which delivers 21 volts + or -
only 0.1 volt for an outstanding +0.5% toler-
ance factor. The TN-400 is not dependent
upon the AC voltage frequency and may
thus be used with either 50 or 60 Hz power
sources. Separate controls for each fre-
quency are provided in the stroboscopic
speed adjustment system; use the appro-
priate control and the correct band on the
indicator for precise adjustment to the rated
speed.
Stylus overhang scale
Stylus overhang adjustment can be checked
quickly by the accurate concentric grooves
etched directly onto the turntable platter.
Both 10 mm and 15 mm radius marks are
provided.
* For repairs after expiration of the War-
tanty period, a service charge will be
required, please contact the nearest
authorized TEAC Service Station.
IMPORTANT: Although the unit may still
be under the Warranty Period, you are liable
for repairs made necessary by abuse or
improper operation of the unit.