10
STUDIO
MASTER T700 Turntable
Sensitivity (MC Sensitivity)
The phono amplifier can be adapted to different sensitivities of MC systems. There are 4 levels for output voltages of 150 µV,
300 µV, 600 µV and 1200 µV to choose from. The gain of the phono preamplifier and thus the output voltage of the audio signal
are set via the sensitivity. The equalization takes place according to the RIAA characteristic (
R
ecording
I
ndustry
A
ssociation of
A
merica).
Attention: DIP switch
Contrary to the selection of terminating resistors,
only 1
DIP switch may be in the
ON
position when setting the sensitivity.
A mixture of different sensitivities is not permitted.
The phono preamplifier is set to the
Ortofon system Quintet Bronze
in the
factory,
which provides an output voltage of 300 µV (0.3 mV at 1000 Hz, 5 cm / sec.)
- see figure on the right.
Fig.: Factory setting for sensitivity
Target speed setting
The tonearm of the
STUDIO
MASTER T700 turntable is set in the factory to the pre-assembled
Ortofon Quintet Bronze
pick-up
system. This includes the parallel alignment of the tonearm to the turntable, the setting to the two angle-neutral fixed points
and the azimuth alignment of the pick-up. Furthermore, the PLL circuit, which is implemented via optical scanning below the
turntable, is set to the target speeds of 33 ⅓ and 45.
Over the years, it may be necessary to readjust the target speed due to wear and tear and aging. This can be seen if it takes
more than approx. 3 -6 seconds to reach the target speed after starting. The calibration is carried out separately for each of the
two target speeds. All you need for calibration is a miniature / watchmaker's screwdriver that is 2.5mm wide. The setting is
carried out on the back of the T700 in the
Speed Calibration
area.
Fig. 1: Rear of T700 with speed controller 33 or 45
Fig. 2: Change of speed
Calibration of target speed
Start the calibration procedure for 33 ⅓ revolutions per minute by pressing down on the two touch
buttons and at the same time for about 5 seconds. The two buttons will now start pulsating. Now
take the miniature screwdriver and turn the spindle trimmer on the back of the T700 in one direction and
watch the pulsating button for a moment. The result is only achieved after 2-4 seconds! If the button
pulsates faster, you have moved further away from the target speed and have to turn in the other
direction. The minimum deviation from the target speed is reached when the button lights up
continuously. You can now conclude the calibration by pressing the stop button .
In the second step, proceed in the same way with the target speed of 45 revolutions per minute by
pressing down on the two touch buttons and at the same time for approx. 5 seconds.
