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  9. Sorane SA-1.2BCS User manual

Sorane SA-1.2BCS User manual

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SA-1.2BCS
Instructions & Manual
Specifications
Total Length 310mm
Effective Length (Tonearm pivot to cartridge stylus) 239mm
Practical Length (Tonearm pivot to spindle) 223mm
Overhang 16mm
Offset angle 22.25°
Horizontal moving sensitivity 30mg
Vertical moving sensitivity 20mg
Vertical Tracking Force (VTF) range 0-4.5g (3+1.5g)
Cartridge plus Headshell weight range 15-45g
Antiskating Adjustment 0-3g (Equivalent to Stylus VTF)
Vertical Bearing Miniature Radial Bearing
Horizontal Bearing Miniature Radial Bearing
Height Adjustment (Plinth to arm-wand centerline) 15-55mm
Output plug RCA (XLR as an Option)
Output cable Single core shielded copper
Tonearm Audio Lead wire High Purity Silver (Internal Wiring)
Headshell lead wire Silver with gold plated terminal
Headshell Machine tooled Aluminum
Tonearm Net Weight 755g
Attached standard Headshell Net Weight 17g
Included Accessories
Headshell
Auxiliary counterweight stem
Detachable phono cable
Screws, Washers and Wrenches
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Template
Marking pin and plastic centering bushing
1) Mounting the tonearm base to turntable plinth
a) Determine where the arm base should be mounted by using the supplied arm mounting template.
b) Put thelarger hole of the template ontothe center spindle. Take the attached marking pin supplied (as
illustrated below) and push it through the small hole at the opposite end of the tonearm template (the
hole opposite the spindle hole). Keep the needle perpendicular to thetemplate. You may now mark
the center point of the tonearm base. The center point of the tonearm base is also the pivot point.
c) At the same time, mark the 3 holes for the screws that mount the arm base to the armboard.
d) Do not drill holes yet !
e) Having marked the center, check to see if there is sufficient clearance for the tonearm and the dust
cover (if you have a dust cover). Pay particular attention to the counterweight shaft.
f) After you have verified the dust cover willwork with thechosen arm base location, drill one 22mm hole
(this is the center, which allows access to the tonearm stem and cable) and three 3.5mm holes (for the
screws that mount the arm base).
22mm diameter hole: For tonearm shaft!
3 x 3.5mm diameter holes: For tonearm base fixing screws!
2) Attach the cartridge to headshell
Connect the wire leads to the cartridge pins, and attach the cartridge to the headshell with screws. (See
the figure below) Screws are not included in this tonearm kit. They are usually included with the
cartridge, from the cartridge manufacturer.
3) Mount SA-1 shaft through the base hole
a) Carefully push the tonearm shaft through the hole in the arm base and then fasten the set-screw with
the hex key supplied with the tonearm. Be careful not to over tighten!
b) Adjust the tonearm height to make the tonearm parallel with the surface of the record when the stylus
is touching the record. This is the starting point, and furtherfine tuning may be necessary depending
on the geometry and the stylus type of the cartridge. Consult the cartridge manufacturer for correct
VTA and VTF!
Template
Arm base
Turntable Plinth
Template
Arm base
φ22mm
Marking pin
3 / 7
c) The cueing platform has already been set at the correct height but can be adjusted by using the
supplied hex key.
4) Cartridge tracking force adjustment
a) Verify that the anti-skating knob (number 3 below) is set at 0 grams.
b) Ensure that the sliding tracking force adjustment knob (number 4 below) is set to zero (the point
furthest to the back of the tonearm and closest to the pivot point).
c) After the cartridge is correctly adjusted for overhang, adjust the counterweight (number 1 below) so
that the arm is floating with the stylus approximately 3-5mm clear of the vinyl record. Once this
adjustment is made, the counterweight should be fixed by the set-screw located on the side of the
counterweight (number 2 below), using the supplied hex key.
d) Add tracking force by using the sliding counterweight located in the middle of tone arm (number 4
below). As the middle counterweight slidesforward,the trackingforce increases. The tracking force
can be increased to a maximum of 3.0 grams with the middle sliding counterweight pushed all the way
forward to the headshell end of the tonearm (each step is equivalent to 0.5 grams x 6 steps, making 3
grams).
e) The auxiliary weight is 1.5 grams (see 5 below). If more than 3 grams of tracking force is needed, as
might be the case when playing 78 rpm records, place the ancillary weight in the hole as illustrated in
the drawing (see 5 below). Only use this auxiliary weight if additional trackingforce is needed! If it is
not needed, store it away in a safe place.
Example: If the tracking force needed is 3 grams, set the middle sliding counterweight at the mark for 3 grams
on the weight gauge. If more than 3 grams of tracking force is needed, use the auxiliary weight of
1.5 grams, along with the counterweight, in order to secure your desired tracking force. For
instance, the ancillary weight of 1.5 grams, plus 2.5 grams of tracking force set by the middle
sliding counterweight, is equivalent to 4 grams total tracking weight.
5
1
2
4
3
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Note: Because the tracking force mechanism (#4 above) of SA-1.2is differentfrom a standard counterweight
system, the use of a separate VTF gauge for precise fine-tuning is recommended. The relative accuracy of
the SA-1.2tracking force mechanism is somewhat affected by the complex interaction of the mass of the main
counterweight, its position, the mass of the cartridge, and the mass of the headshell. So, as is usual with all
tonearms, you should verify the desired tracking force with a calibrated VTF gauge.
4) Auxiliary counterweight stem
In case the standard counterweight is not heavy enough to balance your cartridge/headshell combination, an
additional counterweight stem has been supplied to give additional mass, and greater range of adjustment.
a) Remove the counterweight and headshell, setting them aside in a safe place.
b) Inspect the threads on the auxiliary counterweight stem. If there is any debris, please brush it with a
small paint brush, or clean toothbrush. Debris can cause the threads to become stuck.
c) Attach the auxiliarystem by carefully threading clockwise into the main stem. The threads are normal
“right-hand threaded”.
d) Tighten firmly with your fingers, but donot apply aggressive force. Do not use awrench, or other tool
that would apply too much force on the bearings. Do not use thread-locking compound (removal
would require excessive force). Finger-tighten only!
e) The auxiliary counterweight stem provides two methods of counter-balancing heavier cartridges and
headshells.
(1) The weight of the auxiliary stem provides additional force.
(2) The stem also provides much greater range of adjustment of the main counterweight (thezero-set
counterweight).
5) Anti-skating (bias) adjustment
a) Set the bias adjustment knob to the same number as the tracking force. Some experimentation may
be necessary based on the specific stylus profile used by the cartridge.
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6) Converting between “Positive”and “Negative”Counterweight stub
There are two counterweight stubs supplied with the the SA1.2BCS. Inscribed on the back of both
stubs will be “P”or “N”. P is for Positive, a reference to positive balance. “N”is for Negative, a
reference to negative balance. The inscription faces the tonearm Arm Bearing Box, and is not seen
during operation. Refer to the SA1.2BCS brochure to learn about the benefits of positive versus
negative balance.
Abbreviations:
·Arm Bearing Box = ABB
·Cueing Device Base = CDB
·Arm Main Pillar = AMP
·Anti-Skating = AS
A) When you unpack the SA1.2BCS, you are suggested to confirm counterweight shaft is in Negative
position. The horizontal shaft of the “Positive Balanced”stub will be lower, compared to the shaft of the
main arm wand. The horizontal shaft of the “Negative Balanced”stub will be at the same horizontal
plane as the main arm wand. In the picture below, notice that the shaft is lower than the horizontal
plane of the main arm wand (this is the “Positive Balanced”stub);
B) Prior to start operation to change the stub to “Positive Balance”, make sure the arm is in the arm rest,
the cueing device is in the “down”position, and turn over the tonearm on a soft surface to prevent
scratches. You must return retain this configuration after the installation of the new counterweight stub;
The two counterweight
stems are etched
with a "P" and "N" to differentiate the two.
The difference in center-of-
balance is due to
where the hole is machined that holds the
6 / 7
C) Please note in the third illustration, there is a very fine nylon string betweenAnti-Skating device and
tonearm Main Pillar. It should never be cut, even by accident, during this tonearm stub changing
operation;
D) Unscrew the two Allen head set-screws that secure the Cueing Device Base. Lower the CDB
down the Arm Main Pillar. If the arm is brand new and never used, there will be nylon tubing around the
AMP to protect its surface. You must lower or remove it before lowering the CDB;
E) The 5th photo shows the CDB position after lowering down the AMP. This allows room to insert the
Allen key for unscrewing the set-screws;
Starting Position
Delicate nylon string
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F) Do not lower the CDB too much since you could break the nylon string or even damage the Anti
Skate device;
G) Insert Allen key into Allen head set-screws;
H) After unscrewing 2 screws, carefully pull the stub from ABB.
I) Prepare the other Balance Stub.
K) After changing counterweight stub in ABB, follow steps F~A, in reverse order. The tonearm
should appear the same as the first caption labeled “starting position”.
Removing Allen Head screws from
stem
Prepare next counterweight stem

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