Oracle Audio Delphi Mk VI User manual

The Fine Art of Playing Music
Oracle Audio Technologies
Delphi Mk VI
Owner’s Manual

FOREWORD
This is your Delphi Mk VI Owner’s Manual. The following pages will describe as
succinctly as possible the assembly of your new turntable. Although some operations
are self explanatory, we strongly suggest you read this booklet to better understand the
importance of the different key adjustments.
Attention : It is very important to read the Micro Vibration Stabilizer System instructions
enclosed with this manual. The assembly and the calibration of your new Oracle MK VI
has to be done in the right order to make this calibration as simple as possible.
Your Delphi Mk VI is a precision instrument and its performance will be affected by the
different adjustments. It is important to set up your new turntable with the utmost care
so it can effectively convert record groove modulations into outstanding musical
performance and enjoyment!
Total accuracy of your source system can only be achieved through minute details of
turntable suspension calibration, tone arm installation and cartridge alignment.
A turntable is an artwork of geometry.
Please take your time setting up your turntable.
FOR YOUR RECORDS
Oracle Delphi Mk VI serial Number:
Power Supply Serial Number:
DealersName:
Dealers Address:
Dealer Phone:
PurchaseDate:
We suggest you keep your sales slip together with this owner’s guide.
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Delphi MK VI Installation Manual 2

TABLE OF CONTENTS
Pack and unpack your turntable ...........................................................................4
Assemble the sub chassis.....................................................................................5
Adjust the plinth assembly.....................................................................................6
Install the tone arm and phono cartridge...............................................................7
Align the phono cartridge ......................................................................................8
Prepare the spring modules..................................................................................9
Calibrate the suspension.....................................................................................10
Attach the phono lead .........................................................................................11
Install the drive belt .............................................................................................12
To remove the platter..........................................................................................13
Connect the power supply...................................................................................13
Adjust the 33 / 45 speed......................................................................................14
Attach the ground lead........................................................................................14
Install and calibrate the hinges............................................................................15
Install the record clamp.......................................................................................15
Level the turntable ..............................................................................................16
Troubleshooting...................................................................................................17
Maintenance........................................................................................................18
Specifications......................................................................................................19
Note : The pictures of the drive module in this manual have not yet been up dated with
the pictures of the drive module you will find on your new Delphi Mk VI. This is also the
case for the new Mk VI subchassis and the Micro Vibration Stabilizer System. The black
sub-chassis counterweight system displayed in this manual is also different than the one
used in the new Delphi Mk VI.
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Delphi MK VI Installation Manual 3

PACK AND UNPACK YOUR DELPHI MK VI
Your ORACLE’s packaging has been designed to protect it from the abusive handling normally
encountered during shipping. Such packing materials are expensive and we recommend you save it for
future shipping. When shipping the turntable, position each item in its allocated section. It is mandatory
to use the original packaging for any return to the factory.
All the accessories are positioned strategically in the packaging to prevent them from coming loose and
possibly damaging the turntable during shipping.
•Remove the inner box by lifting it straight up and out. Open the flaps on both ends and slide out
the Styrofoam packaging.
•Lift the Styrofoam cover straight up so as to protect the corner reinforcement.
The following items are located in the upper section of packaging:
•Dust cover (optional item ordered separately)
•Calibrator disc
•Main bearing lubricating oil
•Oracle Power supply
•Accessories bag
oDrive belt
oLint free cloth
oSuspension adjustment gauge
oTools pouch (screw driver, allen keys, 9/64"-3/32"-5/64")
The following items are located in the bottom section of packaging:
•Plinth assembly
•Platter
•Record clamp
•Brilliance cleaner
•Hinges (supplied with the dust cover option)
•Strain relief clip
•Main bearing assembly
•One extra suspension spring
•Three suspension caps
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Delphi MK VI Installation Manual 4

ASSEMBLE THE SUB CHASSIS
Note: Lift the acrylic base straight up so as not to damage the platter’s spindle protruding through.
•Locate the bearing assembly in the lower section of the packaging. Remove the 3 mounting
screws.
•Locate the tool kit in the lower section and select the appropriate 9/64th“ allen key.
•Lift the sub chassis straight up and mount the bearing assembly from underneath (ground lug
side). The bearing assembly can only be mounted in one position
Note: The main bearing mounting flange is marked with a red dot. When installed this red dot
must be on the axis of the motor pulley and the platter spindle. Any other positioning will
impair the operation of your Delphi Mk VI.
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ADJUST THE PLYNTH ASSEMBLY
•Remove the styrofoam support blocks from around the suspension posts.
•Remove the suspension modules (i.e. the suspension housing, the spring and all related parts)
remember that each module has or could have a different color coded spring. The modules have
to go back on the same stem they came from.
•Remove the protective film from around the acrylic base.
•Level the plinth by turning the adjustable feet below.
Note: If you do not have a small carpenter's level to do this job, use the styrofoam blocks as they
were originally installed around the three suspension posts. Seat the sub chassis evenly on
the 3 blocks and use the spirit level on the sub chassis to level the plinth. The suspension
modules are not required for this operation.
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Delphi MK VI Installation Manual 6

INSTALL THE TONE ARM AND PHONO CARTRIDGE
Precaution – When performing anything near the tonearm and cartridge, please do not wear loose
clothing, ties, sweaters or anything than can catch or damage the cartridge or stylus.
Install the tone arm following the manufacturer’s recommendations.
Note: The tonearm installation and calibration will be easier and safer with the sub chassis resting
on the foam shipping blocks as described earlier.
Note: The drive belt should not be used for this operation.
Note: Do not pour the oil in the bearing well for this operation.
Note: Handle the platter installation carefully to prevent any damages to the bearing assembly.
•Install the platter without the drive belt.
•Place the tone arm mounting board loosely in the sub chassis mounting ring and determine the
correct way to mount the arm to the arm board.
•Mount the tone arm to the pre-cut tone arm board.
•Properly secure the tone arm mounting hardware.
Important! If you are planning to cut your own mounting board, remember that the cutting of the arm
board can sometimes be troublesome as well as being a potential hazard. The use of an
adequate tooling is important to both accuracy and safety.
•Use stainless steel or aluminium screws to mount the cartridge for maximum rigidity.
•In preparation for the final alignment, tighten the screws so the cartridge can be moved in the
head shell.
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PRECISELY ALIGN THE PHONE CARTRIDGE
Note: The adequate use of the Oracle calibrator disc will insure an accurate cartridge alignment.
Note: Important! Do not use tape to keep the platter from turning, doing so would damage the
paint finish of the sub chassis or the platter.
Note: Important! Any movement of the platter with the stylus cued down could result in irrevocable
damage to the stylus or the cantilever.
•Place the calibrator disc on the platter, over the mat.
•Prevent the platter from turning for this operation.
•Aim the alignment line (Located over the “O” of Oracle) with the pivot center of the tone arm.
•Adjust the stylus pressure to approximately 1 gram.
•Move the tone arm over the alignment grid and cue it down.
•Check for the horizontality of the arm tube with the surface of the calibrator disc or use the tone
arm manufacturer's supplied tool, adjust the height accordingly.
•Bring the tone arm over the center of the grid again and lower it. The stylus tip must fit in the pin
hole in the center of the grid. If not, position the cartridge so it does.
•Precisely align the body of the cartridge with the lines of the grid. Another way would be to
visualize the cantilever as an extension of the center line of the grid.
•Secure the cartridge screws and repeat the previous operation.
•Check the azimuth (lateral view of the cantilever) by lowering the stylus over the black portion on
the calibrator disc. The mirror reflection will help determine if the cartridge is off its vertical axis.
•Check the stylus pressure and adjust it to the cartridge manufacturer's specifications.
•Install the stylus guard to complete the assembly of your Delphi Mk VI. Do not install the phono
lead at this time.
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PREPARE THE SPRING MODULES
Note: The spring tension of the suspension system can be adjusted two ways. First by using a
different color coded spring. They are coded as follow from the weakest to the strongest,
white (rarely needed... not supplied), yellow, red, green, blue and black (rarely needed... not
supplied). The second is by changing the position of the spring in its holder. The color coding
is visible from the inside at the wider end of the spring.
Note: The reference to clockwise or counter-clockwise is determined by viewing the spring from
above, unless otherwise mentioned.
Note: By hand the spring can only be rotated counter clockwise in its holder. To move it clockwise,
using needle nose pliers, it can be held near the tip at the wider end. It is then possible to
move it clockwise. If this cannot be done, rotate the spring counter clockwise until it comes
out and reinsert it from under the holder leaving more of the spring out.
Note: Before installing the spring back into the suspension housing, hold it with one hand and pull
on it at the wider end, this stretching will insure a positive seating in the threads of the holder.
Step one - Pre-loading the spring.
•Adjust the spring so three coils are showing below the holder.
Step two - Preparing a spring module.
•Position the upper spring damper over the suspension stem.
•Install the Sorbothane damper over the spring holder and seat it well around the lip.
•Insert the spring assembly into the suspension housing.
•Install the suspension housing over the spring assembly.
Note: The factory standard settings:
Yellow - front left module
Green - right module
Red - rear left module
The blue spring is supplied as extra
Note: The standard spring combination will accommodate most tonearms.
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CALIBRATE THE SUSPENSION
Note: Before beginning this step the record clamp and an old record must be in place over the
platter. This will give a more accurate operational mass of the sub chassis.
Note: Do not install the drive belt or the phono lead so as to prevent any bias in the interpretation of
the calibration.
Note: Always start the calibration with the module near the tone arm then move to the rear left and
finally to the front module.
•Place the sub chassis over the suspension modules.
•Install the platter without the drive belt.
•Locate the suspension gauge in the documentation envelope.
•Do not consider "A", nor 1 & 2, they were used on the earlier models.
•Place the gauge on the acrylic base with the "B" side against the lock feet.
•For the first round bring all three suspension housings at 3 mm (1/8" inch)
above the "B" step on all three modules.
•For the second round, reduce the increments to 1/8 of a turn or less until the suspension housing
touches the step on the gauge very lightly.
Note: With the spring adjusted as per step one, the bottom of the suspension housing should be
well above the "B" step of the gauge.
If it falls below… this is an indication that the spring used is too weak for this tonearm application.
If a small adjustment is necessary to move the suspension housing above the ‘B’ line, remove the sub
chassis and move the weak spring counter clockwise in its holder (looking at it from the wide side).
Recalibrate the suspension.
If the adjustment needed is important, identify the color code and use the next stiffer spring. With a new
spring start the calibration procedure over.
Note: If the distance between the bottom of the suspension housing and the gauge is small, rotate
the spring counter-clockwise by increments of ¼ of a turn, if the distance is large start by
making full turns of the spring. Always apply a downward pressure on the record clamp to
stretch the spring prior to taking a new reading.
Note: In the event that the suspension housing goes below the "B" step, start the procedure step
one again.
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