Pioneer SA-9800 Інструкція з експлуатації Посібник з експлуатації - Сторінка 12
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EFFECTIVE OPERATIONS
LOAD RESISTANCE AND LOAD
CAPACITANCE
Typical
moving
magnet
(MM)
cartridges
have
resonance
peaks at high frequencies, as shown
in
Fig. 9). However, the height of the peaks can be
varied
by changing
the load
resistance
(ohms).
The
peaks increase as the resistance is increased.
In addition, the resonance frequency (center of the
peak frequency) can be varied by changing the load
capacitance (pF), as shown in Fig. 10. If the capac-
itance is increased, then the resonance frequency is
lowered and the peaks are increased. To provide
the best characteristics of your cartridge, set the
"pF" and "ohms" switches, following the instruc-
tions
outlined
below.
By combining
these
two
knobs,
you
will be able to obtain a variety of
different high-frequency responses.
When the phono cartridge load resistance and
capacitance are specified
e Set
the
specified
load
resistance
with
the
"ohms" knob.
,
e Subtract the turntable capacitance (stray capac-
itance of the output cord, tonearm, etc.) from
the cartridge's specified capacitance and select
this value with the "pF" knob.
NOTES:
©
Refer to the operating instructions of the cartridge for
the specified load resistance and capacitance values.
e
When
the load resistance switch
is at 100%
position,
the sound volume will be reduced,
©
Since the turntable capacitance varies with the output
cord, wiring and other factors, a precise value cannot
be definitely determined. In general, however, it can be
considered
to be in the range
of 100pF
to 200pF.
Adjust the load capacitance while listening to a record.
e The capacitance
of Pioneer's turntables ranges
from 75pF to 150pF. Subtract the capacitance
from the load capacitance shown in the table,
and then set the switch to the value which
is
closest to the resulting figure.
For example,
say you are using the PC-550E/II
by Pioneer. Subtract 100pF from 170pF which
gives 70pF. Set the cartridge load capacitance
switch to the closest figure, which is "100pF"'.
When not specified
The example
in Fig. 10. shows
typical high-end
frequency curves. In a case like this, adjust both
switches for the desired response while listening to
a record. With ordinary MM cartridges, the values
are 50 kilohms and 100pF ~ 200pF.
CARTRIDGE
LOAD
200
o e ,
3OK
er
Load capacitance
Load resistance
knob
knob
Fig. 8
Examples of Frequency Response Variations due to the Cartridge
Load Resistance Switch Settings.
Resistance: high
Resistance: low
—> Response
—
Frequency
Fig. 9
Examples of Frequency Response Variations due to the Cartridge
Load Capacitance Switch Settings.
Capacitance: high
Capacitance: low
» Response
—> Frequency
Fig. 10
Makers of cartridges and recommended loads
=
a
"Load
|
Load
|
Cartridge
=
;
|
7
resistance
acitance
Manufacturer | Powe gone,
| (oben) | ee
|
Pioneer
PC-550E/Il (MM)
am
=|
170
|
ADC
XLM MKII (IM)
47k
275
|
AKG
PSE (MI)
47k
400
|
Empire
20002 (Mi)
47k
300
Ortofon
VMS20E (M1)
47k
400
|
Shure
VIS TYPEIViMM) | 47k
200~300
Stanton
680 EE (Mi)
47k
|
275
12