Hitachi HCA-7500 - Controls and Switches; Power Switch Operation; Power Indicator Light; Low Filter Function

Important for U.K.:
WARNING: This apparatus must be earthed.
The wires in this mains lead are coloured in accordance with the following code:
Green and Yellow : EARTH
Blue : NEUTRAL
Brown : LIVE
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured
markings identifying the terminals in your plug proceed as follows. The wire which is coloured GREEN and
YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety
earth symbol += or coloured GREEN or GREEN and YELLOW.
The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or
coloured BLACK.
or coloured RED.
The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L
CONTROLS AND SWITCHES
@ POWER switch
When this switch is set to ON, power is supplied
to the amplifier and the POWER INDICATOR
@ lights up. There is a built-in muting circuit
so that the relays are actuated about 5 seconds
after the power has been switched on. Then the
amplifier starts normal operation.
(2) POWER INDICATOR
This lights up when the POWER switch (@® is
set to ON.
(3) LOW FILTER switch
When this switch is set to the 15 Hz position,
low frequency noise which is generated by
warps in the records is cut out. It is wise to
keep this switch at the 15 Hz position since
it is effective in cutting out low frequency
noise outside the range of hearing which can
adversely affect the speakers (12 dB/oct.).
@ HIGH FILTER switch
Set this switch to the 8 kHz position when you
want to cut out scratch noise from records, hiss
noise from tapes and high-frequency noise
when listening to a broadcast. This switch is
designed to cut out smoothly the treble from
8 kHz at 6 dB/oct.
©) MODE switch
This switch allows any of five selections.
STEREO
REVERSE. . .This reverses the left and right
channels.
NORMAL .. .This gives a normal stereo ef-
fect.
MONO
PR Vee oS The left and right channel
signals are mixed.
RC eee Only the signals from the left
input terminals are repro-
duced through the left and
right speakers.
Res 2 edd oe Only the signals from the
right input terminals are re-
produced through the left
and right speakers.
© BALANCE control
Adjusts the balance of right and left channel
levels.
@ CARTRIDGE LOAD selectors
Use these selectors to set the load capacitance
and load resistance to levels that correspond to
the cartridge which is being used. The left-hand
knob is for load capacitance settings (100/200/
300/400 pF) and the right-hand knob is for
load resistance settings {(0.1/10/50/100 k-ohms).
Usually with moving magnet cartridges, the
reproduction characteristics undergo great
change when the load capacitance and load
resistance are varied. An illustration of this is
given in the figure below. It shows the charac-
teristics displayed when the load capacitance
and load resistance are varied when Hitachi's
MT-202MKIL cartridge is used.
By selecting the load of the cartridge, the opti-
mum values can be chosen in line with the
characteristics of the cartridge employing load
capacitance and load resistance. When both the
load capacitance and load resistance of the
cartridge being used are specified, set the selec-
tors to positions which correspond approxi-
mately to these values. If it is not clear exactly
what these values are, take 100 pF and 50 k-
ohms as the reference. Other combinations may
also be tried out if they yield a sound quality
which meets the individual preference of the
listener. The 0.1 k-ohm position for load resist-
ance is for high-output moving coil cartridges
(those which do not require a booster trans-
former). Do not set the selector to this position
for moving magnet cartridges.
Response (dB)
+
-202MKIL
Load capacitance: 100 pF position
Cartridge u:
Ik 2k Sk Sk ~~ 0k SCO
Frequency (Hz)
Response (dB)
Cartridge used: 2
Load resistance 50 k-ohms position
Ik 2k 5k 10k 20k 40k
Frequency (Hz)