Upgraded and Modified BG7TBL Higher Quality 10MHz OCXO Master Clock with Counter Display

S$ 370.0S$ 395.0

Only limited sets available!

  • Recently more higher grade of consumer audio equipment comes built-in with Clock inputs
  • Input of an external Clock provides a more stable and consistent frequency timing, overwriting the often less precise on-board ones
  • Very noticeably, you can immediately feel the improved clarity and ‘timing’ in the music. The notes are seemingly much more aligned, producing a very clear imaging of sound with the background turning instantly transparent and noise-free
  • The fact the music just sounds right is a huge step up and is a thoroughly enjoyable improvement
  • BG7TBL has been a very popular Clock generator producer in China which has gathered massive praise and compliments over the years
  • To better improve the product, QA upgraded from the stock basic caps to Vishay BC caps
  • At the core of the Master Clock, QA chose and upgraded to using Oscilloquartz (datasheet) and Toyocom OCXOs, made in Switzerland and Japan respectively, the higher quality and precision of the OCXO is a huge upgrade over the stock one which is more commonly made in China
  • Only the finest few of the OCXOs QA has sourced from makes the final selection to be used in the upgrade
  • We have calibrated the output to be within ± 3 Hz of the reference 10MHz, an accuracy deemed respectable and within expectation for the price
  • The addition of a frequency counter onto the chassis as a touch of an aesthetical industrial approach, displaying the real-time output frequency of the Master Clock
  • With its own components and oscillators at circuit level, it is important to understand the perfectly-normal drifting of timing in the counter itself can affect another ± 5 Hz of output deviation
  • 2 toggle switches control the frequency counter, while the ground post allows ground box to be connected easily which further improves the sound in transparency and details
  • 2 ways of placement – either on the back or on its side
  • A warm up time of at least 5-7 minute is needed for the frequency to stabilise. 15 minutes onwards will be primed for use
  • Comes with a SG/UK-plug type 12V power adapter and a 50cm 50-ohm BNC cable
  • 1.47Vrms, 4.41Vpp, 16.24 dBm
  • Can get together with our 6dB RF Attenuator as a package price to pad the output level down if required
  • 1-year warranty from QA

Description

Clock syncing in audio has very much been in the realms of professional settings, until recently where more higher grade of consumer audio equipment comes built-in with Clock inputs.

Many equipment already have crystals and oscillators in them to generate the necessary timings. But an input of an external Clock, a reference 10MHz Master Clock for example, from an OCXO most of the time, provides an even more stable and consistent frequency, overwriting the often less precise on-board ones. The result is very significant – very noticeably, you can immediately feel the improved clarity and ‘timing’ in the music. The notes are seemingly much more aligned, producing a very clear imaging of sound with the background turning instantly transparent and noise-free. External Clock sync does not really colour the sound in a sense, but the fact the music just sounds right is a huge step up and is a thoroughly enjoyable improvement.

The complexity and less common nature of usage of Master Clocks has elevated such Clock generators to being a luxury equipment in hifi, because presumably, they are only usable on equally higher end range of DACs or transports where external input is present. Master Clock generators are hence uncommon to be priced over thousands of dollars. But high performance in hifi is still possibly affordable, and QA is proud to have our very own Upgraded and Modified BG7TBL Higher Quality 10MHz OCXO Master Clock with Counter Display. BG7TBL has been a very popular Clock generator producer in China which has gathered massive praise and compliments over the years by audiophiles and RF enthusiasts alike. It is a very good step towards owning a Master Clock without first spending over a few thousand dollars.

So, working on the already-good product, QA upgraded from the stock basic caps to Vishay BC caps. At the core of the Master Clock is the all-important OCXO, which QA chose and upgraded from generic, brandless ones that came on stock to using Oscilloquartz (datasheet) and Toyocom OCXOs. Made in Switzerland and Japan respectively, the higher quality and precision of the OCXO is a huge upgrade over the stock one which is more commonly made in China. Switzerland and Japan, just as they are as excellent in their watch-making supremacies and intricacies, are two of the best in producing various clock crystals and oscillators.

From the limited number of OCXOs QA went through in testing, it is assured only the finest few of the OCXOs QA has sourced from makes the final selection to be used in the upgrade and in every machine, which we have calibrated the output to be within ± 3 Hz of the reference 10MHz, an accuracy deemed respectable and within expectation for the price.

The modification includes the addition of a frequency counter onto the chassis as a touch of an aesthetical industrial approach, displaying the real-time output frequency of the Master Clock. With its own components and oscillators at circuit level, it is important to understand the perfectly-normal drifting of timing in the counter itself can affect another ± 5 Hz of output deviation.

At the faceplate area, we have added 2 toggle switches for the control of the frequency counter. The one on the far-right switches on and off the counter, allowing the lights from the counter to be totally shut off. The toggle switch in the middle connects/disconnects the reading of the frequency. Output 2 and 3 are 10MHz Sine waves while Output 1 is 10MHz Square wave. Unless your equipment specifically asked for Square wave, ALWAYS use the Sine wave of Output 3 FIRST. 2nd Sine wave usage on another equipment can then be on Output 2 where the toggle switch MUST BE OFF (flicked down towards the BNC). Disconnecting the reading of the frequency counter when using Output 2 ensures the circuitry from the frequency counter does not get in the 10MHz output signal, thereby distorting it.

On the far left is a ground post which QA highly recommends in connecting to a ground box if one has it. The increased transparency and details are totally worthwhile for us to include this modification.

With 2 ways of placement – either on the back or on its side, the Master Clock is a very sensitive equipment prone to any movement thereby affecting its accuracy, it is recommended not to move around while it is on. A warm up time of at least 5-7 minute is needed for the frequency to stabilise to 10MHz which the frequency counter will show. 15 minutes onwards will be primed for use. There are various sayings on how long it should be warmed up for the best sound, but like vacuum tubes, in QA’s opinion, letting them warming up for hours or even days has no huge worthy difference compared to after 30 minutes onwards, but only diminishing the lifespan of these tubes and Clocks. YMMV, but do not waste their lifespans unnecessarily!

The Master Clock comes with a SG/UK-plug type 12V power adapter, a 50cm 50-ohm BNC cable and 1-year warranty from QA.

Additional information

Weight 2 kg

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