Oracle Audio has produced over 11,000 Delphi turntables since 1979 and still supplies parts & upgrades for most of its legacy products! You can read about these upgrades below on this page or download the PDF document by clicking on the image to the right.

 

        In time we also received reviews and comments on our upgrades. These texts are available for you to read because of the generosity and kindness of their authors.

MkVI Drive Electronics upgrade for Delphi MkI, MkII and MkIII

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           This factory upgrade kit includes a new motor and drive electronics circuit, a regular power supply, a drive belt, 3ml syringe of bearing lubricating oil and necessary tools. On the Delphi MkI and the MkII we need to install a new aluminum drive module and new motor housing. On the Delphi MkIII we install the upgrade using the same motor drive module and motor housing hence this model does not require machining of its sub-chassis. For the Delphi MkI a sub-chassis modification will be required to make room for the new motor housing. This work is performed at the factory or by a professional machinist.

                                                                                                                               

            The main advantage of this upgrade option is that you get the new MkVI drive electronics and motor furthermore, your Oracle keeps its vintage look. The only drawback is the fact that this upgrade must be carried out at the Oracle factory which requires packing and shipping your Delphi.

 

Note:  The above pictures show the MVSS aluminum cups installed but this is not part of this upgrade. You can read more about the benefits of the MVSS upgrade further down this page.

Delphi MkI

Delphi MkII

Delphi MkIII

(includes the sub chassis modification for the new motor housing).

(new motor housing and drive module, no sub-chassis modification).

(we use the same motor drive module and motor housing).

 

MkVI Second Generation Drive Electronics Upgrade for Delphi MkIV & MkV

New MkVI AC synchronous motor. 

New MkVI Second Generation drive electronics circuit.

New regular power supply.

New drive belt, syringe with 3ml bearing oil.

* Optional complete MkVI drive electronics aluminum module

          The Delphi MkIV can be fitted with the complete MkVI drive electronics aluminum module assembly including the new MkVI motor and MkVI drive electronics circuit and a brand new clear acrylic base.

 

          The Delphi MkV can be fitted with the complete MkVI drive electronics aluminum module assembly including the new MkVI motor and MkVI drive electronics circuit.

Second Generation MkVI drive electronics circuit for Delphi MKVI

For Delphi MKVI with serial number between 10860 and 10899;

 

  • New MkVI AC synchronous motor.

  • New MkVI Second New Generation drive electronics circuit.

  • New drive belt, syringe with 3ml bearing oil.

  • Speed selector fingers re-calibrated.

 

For Delphi MkVI with serial number 10900 and above;

 

  • New MkVI Second Generation drive electronics circuit.

  • New drive belt, syringe with 3ml bearing oil.

  • Speed selector fingers re-calibrated.

 

MkVI Micro Vibration Stabilizer System (MVSS) upgrade

 

             The Micro Vibration Stabilizer System (MVSS) is the single most significant and most efficient improvement made to the Oracle turntable since its creation 35 years ago! The MVSS system represents the ultimate step towards eliminating micro vibrations. This system will virtually eliminate the access of micro vibrations to the most critical part of the turntable; the sub-chassis, tonearm, phono cartridge and platter assembly. More details on the MVSS can be found on our website in the product section under the Delphi MkVI Design & technology section.

 

              The installation process will require the sub-chassis to be drilled and mounting holes threaded to install the 3 threaded posts that support the adjustable plungers. The acrylic base will need to be drilled to install the 3 brushed aluminum silicone cups. This work is performed at the factory or by a professional machinist.

 

The MkVI Second Generation 2-piece platter

        The new two-piece platter assembly greatly facilitates drive belt installation and consequently protects the performance level of the Delphi turntable in time. Indeed with the new platter configuration users no longer have to horizontally align the belt with the pulley while at the same time coordinating the vertical alignment of the massive main platter inside the bearing assembly.  Installing the light inner platter-hub first is safely done with both hands assuring no stress to the two groups of precision set screws holding the spindle inside the bearing. The drive belt is then easily installed around the pulley and the inner-platter hub. The final step requires to gently deposit the main platter ring on the inner platter hub which is also safely done with both hands. This three step procedure assures that the precise calibration of the Delphi’s bearing stays intact which is very important as the bearing assembly is central to the Delphi’s performance. This new two-piece platter assembly also contributes to a sonic improvement for the Delphi turntable!  The mechanical coupling of the inner hub and main platter ring contributes in further reducing platter resonances. This translates into a reduced surface noise allowing the music to be reproduced on a quieter background.

For Delphi MkVI

Package including the 2-piece platter, drive belt and bearing calibration and a syringe of spindle oil. (Requires shipping your bearing to the factory).

For Delphi MkV

Package including the 2-piece platter, drive belt and a new MkVI bearing   and a syringe of spindle oil. (Easy installation by owner).

For Delphi MkIV

Package including the 2-piece platter, drive belt and a new MkVI bearing  and a syringe of spindle oil. (Requires shipping your bearing to the factory). (Delphi MkIV owners will be asked to send a photo of their bearing mounting flange so that the new MkVI bearing’s flange fits the sub-chassis screw holes).

For Delphi MkI, MkII and MkIII

Package including the 2-piece platter, drive belt, a new MkVI bearing and a syringe of spindle oil. (Requires shipping the floating sub-chassis to the factory so it can be adapted to fit the new larger bearing).

 

The MkVI  Main Bearing upgrade

          The MkVI bearing system maintained the six point contact design that was developed for the MkV but improved it. The six calibration set screws are made of PEEK high strength and low friction thermoplastic material with high thermal stability. This means that the precision set screws are virtually inert to dimensional changes due to temperature fluctuation allowing us to calibrate the main bearing system with greater accuracy and closer tolerances. This has a huge and direct impact on the retrieval of minute signals from the record groove and translates directly in better sound. The MkVI bottom thrust plate is now made of glass filled Torlon, a polyamide-imide (PAI) high strength plastic with the highest strength and stiffness of any thermoplastic. It has outstanding resistance to wear. The impact of this new thrust plate is extremely significant on the sound quality because of its ability to limit the noise generated by the spinning platter. The sonic benefits of the new MkVI bearing system are extremely significant and even more so when combined to the MVSS upgrade. This upgrade includes a syringe of bearing oil.

 

MkVI Delrin Adjustable Feet upgrade

      In our quest to further increase the performance level of the new MkVI we did not hesitate to challenge each of the systems we had in place on the Oracle Delphi. Extensive testing and listening tests convinced us that the use of Delrin was extremely beneficial to the performance of the turntable. We found the new MkVI Delrin adjustable feet to provide a better sonic balance with all the different equipment racks it has been tested. This new system further improves the natural tones of the instruments and voices. In fact, it is the whole musical spectrum that has been improved with the integration of this new upgrade!

 

Delrin suspension pillars upgrade for the Delphi Mk I and Mk II

      The new delrin suspension pillars are available for MkI and MkII models with serial number up to 8134. They will replace the aluminum leveling stems for the MkI or the brass pillars on the MkII. The sound improvement is noticeable from the run in groove of the record even before the music starts playing. You will experience a more quiet background with all the enjoyable sound improvement revealed. By very far the best sound improvement for the money!

 

        In the picture below, the model A identifies the MkI system and the model B identifies the MkII version. You must specify the proper model when ordering. Does not include the three aluminum counter feet.

The Delrin suspension pillars upgrade for Delphi MkIV to MkV

       The new delrin suspension pillars are available for MkIII and MkIV models from serial number 8135 and up and for MkV models with a serial number prior to 9990. They are interchangeable with the nickel plated steel pillars. They will replace the aluminum pillars provided that a new thread is machined in the counter feet. The sound improvement is noticeable from the run in groove of the record even before the music starts playing. You will experience a more quiet background with all the enjoyable sound improvement revealed. By very far the best sound improvement for the money!

 

The MkV / MkVI  Record Clamp

          The record clamp has been redesigned to better reject the unwanted vibrational energy generated by the spinning platter spindle. Two mechanical filters were added to the already very efficient record clamping system. A central delrin coupling unit will reject the noise coming from the spindle and a specially shaped O-ring has been mounted to the peripheral section of the coupling dish which further reduces the noise being transmitted to the surface of the record while providing a smooth yet efficient coupling of the record. The sonic benefit will be a more open sound with a reduced surface noise.

 

The Turbo MkII Power Adaptor

          The Turbo Power Supply MkII is designed to be used with the Delphi MkVI and the Paris MkV. It is also fully compatible with the Delphi MkV or any vintage Delphi turntables using an MkV or MkVI motor & drive electronic circuit upgrade!

 

          The original Turbo power adaptor was introduced with the Delphi MkV in 1996. The new MkII is the result of an extensive development and performance comparisons between reference elements such as special batteries and monstrous power sources. All the above outperformed the regular Oracle power adaptor. The Oracle Turbo MkII outperformed them all! It transforms an outstanding performance into a wonderful musical experience.

 

Note: It is possible to upgrade the Turbo MkI to the Turbo MkII.

 

The MkV Counterweight

         The 1.2 kilo (three pounds) sub-chassis counter weight plays an important role with the suspension system of the turntable by increasing the sub-chassis lateral stability and by simplifying the achievement of an accurate suspension calibration. The improvement is very noticeable in overall clarity, focus and bass extension. An additional charge applies for a factory installation.

 

 

The hard acrylic mat

          The hard acrylic mat represents a significant improvement with respect to the original Oracle Groove Isolator that was used by Oracle until the end of the 80’s. The acrylic mat is machined with a slightly concave surface which helps flattening of the record more efficiently when using the Oracle record clamp. The acrylic has very similar vibrational energy transmission properties than the vinyl used in records which minimizes its contribution to sound coloration. Listening tests have shown better results in transient response, stereo image and provided more control and detail in the low frequencies.

 

Platter Peripheral Wave Trap

          The original Oracle AC turntable and the Delphi MkI, MkII and MkIII platters were fitted with an external peripheral wave trap who’s role was to dampen platter resonaces. If you peripheral wave trap is damaged or missing we strongly suggest to use our replacement O-ring wave trap! The usage of an efficient wave trap will help silence platter vibration and resonances which will result in a much more silent background for the music to paint itself upon. This should not be considered as an upgrade (other than visual) but rather as a replacement of a missing or damaged part that makes sure the Delphi functions according to its original specifications. The replacement wave trap is composed of a set of three O-rings that can be installed by the owner.

 

Maintenance kit WITH or WITHOUT replacement springs

         The maintenance of your Oracle turntable will not necessarily involve replacing the springs unless you are planning to replace the tonearm. This is why our maintenance kits are available with or without suspension springs. These springs have been designed for a load bearing capacity far superior to their application. They will last many years! The maintenance kit contains the following;

-Three upper spring damper set and nylon sleeves

-Three sorbothane suspension damper ring

-Three inner-spring felt dampers

-A replacement drive belt

-A syringe of bearing oil

-A suspension calibration tool

-Cleaning cloth

-Bottle of Brillance* cleaner product

-Optional set of four replacement springs (white, yellow, green and red)

Note: A stiffer blue spring is available. For example if someone plans to use a FR64 tonearm with a B60 stabilizer the right side spring ought to be stiffer. It is possible to customize the colors of the springs you order in the maintenance kit to suit your needs.

 
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