OP23A-OP20A Signature 6CH Output Ultra Precision OCXO 10MHz Master Clock

★This product is currently being sold to pre-orderers, so please understand that the stock may be displayed as "Sold Out." If you would like to purchase this product, please let us know about your pre-order through the inquiry form. No payment is required for pre-orders.

★The OP20AS grade only will be on sale from February 20th, no reservations required.

Introducing the Flagship Master Clock, a Culmination of Cybershaft's Expertise and Experience

・The Signature series is Cybershaft's flagship master clock, a complete upgrade from previous models, offering both performance and reliability.
・This product features 6-channel output and is compatible with a wide range of systems, from single-DAC systems to systems requiring multiple 10MHz inputs, such as hubs.
・It uses a brand-new OCXO unit specifically designed for the Signature series, undergoing extensive calibration and selection to ensure only the most stable units are installed.
・A newly developed magnetically shielded transformer case allows for the release of a model compatible with both AC and DC power supplies.
・The power supply circuit features an ultra-low noise, ultra-high PSRR power supply, with a total of 12 next-generation LT3045 linear regulators, six in the primary power supply and six in the secondary power supply. (The DC-only model has six.)
・In addition to the 6-channel model, the Signature series is also available in 4-channel and 2-channel output models.

★We will ship your order approximately 3-4 weeks after your order is confirmed.
★As of Jan 2026, the OP23A-OP21A phase noise and Allan Deviation characteristics are the world's best for an audio clock.

Signature Series Features:

Features:

・This unit features a high-performance OCXO unit with phase noise of less than -123dBc/Hz and Allan variance of less than 1.3E-13, making it rare even for research institutions. (OP23A)
・The OCXO unit is housed in a sturdy steel box constructed with magnetically shielding plates and heat-shielding boards, ensuring optimal performance.
・Six output channels are convenient for applications requiring multiple clock signals, such as single DACs or hubs. Each channel can be set to 50Ω or 75Ω impedance. (Utility Model Registered)
・Each channel's output GND can be individually configured to connect to the unit's GND or isolate it. (Utility Model Registered) This allows for precise adjustments to the complex GND configurations that vary between audio systems.
・The clock output level can be switched between 1.6Vp-p and 3.0Vp-p, enabling compatibility with virtually any audio device. (All channels switched simultaneously)
・ A newly developed pure-iron magnetically shielded transformer case eliminates the effects of magnetic flux leakage from the built-in transformer. The primary power supply incorporates a power supply circuit equivalent to that of the LTPW06. (AC/DC compatible model only)
・The main circuit power supply also utilizes six LT3045, a next-generation linear regulator with ultra-low noise and ultra-high PSRR, to thoroughly eliminate noise.
・The internal circuit board uses a 70μm thick copper foil board, twice the thickness of the standard. The internal layout, which has been repeatedly tested, is optimally designed.
・The chassis bottom is secured to a 2mm thick aluminum plate and a 3mm thick pure copper plate, for a total of 5mm of robust vibration-damping. Three-point support feet made of die-cast aluminum ensure stability on any surface. Optional spike insulators can be installed using 4mm screws.
・Precision characteristics are measured using highly calibrated measuring equipment. Phase noise and Allan variance are plotted for each unit to ensure clock quality.
・We stand by our product's reliability with a 2-year complimentary repair warranty.

Output GND Insulation / Enclosure GND Selection Function:

Choose between two grounding configurations for the output GND: insulation from chassis GND or connection to housing GND. Using a common ground for the output GND can lead to ground loop noise, especially when multiple devices are interconnected. To combat this, it's typically preferable to insulate each output's GND. Yet, in some systems where devices have consistent grounding, grounding the output GND to the housing GND might yield superior noise resistance. Given the diverse audio environments, select the option best suited for yours. This device also includes a terminal for housing GND on its base plate.

Power Supply System:
Equipped with a 6-unit parallel x 2-stage circuit that maximizes the performance of the new generation linear regulator LT3045

< AC/DC Dual-Purpose Model >

1. R-core transformer with minimal magnetic flux leakage → Housed in a newly developed magnetically shielded transformer case to block electromagnetic waves.

2. AC → SiC-SBD (minimal reverse recovery noise) → Rectification → Smoothing with an 18,800uF large-capacity, low-ESR capacitor.

3. DC 18V → LT3086 → DC 16.5V → LT3045 x 6 in parallel (RMS Noise 0.33uV) → DC 15V → Internal DC/External DC.

< AC/DC Dual-Purpose Model / DC-Only Model >

4. DC Input → LT3045 x 6 in parallel (RMS Noise 0.33uV) → DC 12V → Main Circuit/OCXO.

Connecting multiple LT3045s in parallel can reduce the device's internal semiconductor noise.

[Example of self-noise] 0.8uV_RMS with one LT3045 / 0.46uV_RMS with three parallel units / 0.33uV_RMS with six parallel units

Furthermore, by configuring six LT3045s in two parallel stages, the ripple rejection ratio (PSRR) is over 100dB.

*The AC power supply of this unit incorporates parts and circuits equivalent to those of the newly developed LTPW03.

*The AC/DC compatible model can output DC (15V) to external devices when using the built-in AC power supply.

OCXO Characteristic Selection Value:

Our product features an OCXO unit, stabilized and calibrated over several months, ensuring optimal performance as an audio clock. We don't simply gauge the built-in OCXO unit's output characteristics. Our rigorous calibration measures from the product's output terminal, providing a holistic view, inclusive of the buffer circuit's performance.

[ Selection Characteristic Value ]

* We have changed the previously announced reference value for each grade to the selection value actually used by us and released it. All products already sold are shipped with the OP selection values in this table.

OP grade guarantee card :

An "OP grade certificate" with hologram is always attached to each OP grade product.
A tamperproof sticker is attached in the center. A hologram is printed on the right edge. In addition, a hologram sheet with the serial number described in the option grade certificate will be attached to the OCXO unit inside the main unit. Please be sure to check when purchasing for second use.

Compatible audio products:

ESOTERIC Grandioso T1,K1X,K1,P1X,P1X,P1,D1X,D1,K-01XD,K-01Xs,K-01X,K-01,K-03XD,K-03Xs,K-03X,K-03,K-05Xs,K-05X,K-05,K-07Xs,K-07X,K-07,,D-02X,D-02,D-05X,D-07X,P-021,P-02X,N-01XD,N-01,N-03T,N-05XD,N-05,G-0,G-0s,G-0Rb,G-02,G-03X,G-25U,TASCAM CG1000 / dCS　Vivaldi clock,Paganini clock,Scarlatti Clock / MUTEC iCLOCK,MC-3+,MC-3+USB / Antelope Audio Isochrone OCX HD,OCX-V,OCX,TRINITY,PURE2,ZODIAC PLATINUM,Amari / VMV SMSL D3 / DELA N1-S38 / Phasemation HD-7A / SFORZATO DSP-Vera,DSP-Dorado,DSP-Pavo,DSC-Vera,DSC-Drado,DSC-Grus,DSP-01,DST-01,DSP-03,DSP-05 / TEAC UD-701N,UD-503,UD-505,UD505-X,NT-503,NT-505,NT-505-X / SPEC RMP-X1 / Sound Warrior SWD-CL10 (OCX) / TechDAS D-7,D7i / M2TECH EVO DAC TWO PLUS,HIFACE EVO TWO / CH Precision C1,D1 / Triode TRV-CD6SE/BK / aurender W20,N20,N150 / soulnote D-3,D-2,S-3 / SOtM sMS-200ultra,tX-USBultra,SOtM sNH-10G (require master clock input function) /GUSTARD U16,U18,R26,A26,X26pro / Singxer SU-2 / iFi Audio Pro iDSD (Signature) / UpTone Audio EtherREGEN / Audio Gd DI-20HE,DI-20,R-7HE (version 2020),R-7 (version 2020)
Other, master clock generator with 10MHz clock input, CDP, DDC, DAC, Audio HUB, etc.
*If you are uncertain about the specifications of the device you are using, please contact us with the model name.

Specification:

Accessories: instruction manual, test report, and phase noise/Alan Deviation characteristic graph
five 50 ohm terminators (for unused output termination).
( BNC cable and AC power cable is not included. )
Output: 10 MHz x 6 lines, sine wave
Output level: LOW: 1.6V p-p HIGH: 3.0V p-p (6 ch common switching 50 ohm)
Output impedance: 50 ohms/75 ohms Each system is individually switchable
Output GND potential: Main body GND/insulation can be switched (each system can be switched independently)
Body size: W290mm x D250mm x H95mm 
Weight: approx. 5.4 kg
AC POWER: option -A/110-120V 8-30w option -B/ 220-240V 8-30wq
External DC power supply: DC 13.5V-17V 1A
External DC plug standard: 2.1 mm/5.5 mm screwable

○ 2-year free repair guarantee
*Design and specifications are subject to change without notice for improvement.

< Q & A >
Q: Has the oven monitor LED been removed?
A: Yes, the oven monitor LED has been removed. In past cases with our products, there have been no cases where only the oven on the OCXO failed. There have been about three cases where the OCXO itself failed, but in those cases, the output signal was lost and it was not possible to lock on the connected device, so it was immediately obvious. Unfortunately, there have been over a dozen cases where the oven monitor LED failed. This was counterproductive, as the monitor function itself, which is supposed to determine the failure, was the most common cause of failure. Therefore, the oven monitor LED has been removed.