Clock experiments
Over the last year, I've been using a special rubidium clock as master clock for my DCS system. The clock is a prototype from one of the leading digital timing companies in which they synch rubidium with an ocxo to get the benefits of both.
Because this was such a step up from the standard Scarlatti and Vivaldi clocks, I decided to investigate what further refinements in clock accuracy were possible. Last week I received here a prototype clock using a BVA crystal. This is the ultimate development of the OCXO to improve phase noise by an order of magnitude. Results? A huge increase in sound quality through a reduction of remaining digital edge. I am amazed how much cleaner the sound is. Sound has an analogue sweetness but with great resolution. Downsides? Two main ones. First cost: the only commercial example made for the HiFi world is $35k although should be possible to build one for nearer $10-15k; second drawback is stabilisation is quite slow, typically 48 hours to get to peak performance. It really is surprising how big an effect these timing refinements can make to sound quality. |
Will an Esoteric clock work with your system? Mine was around 16K, it made a significant difference with my Esoteric separates. 35K for rubidium clock seems absurd. I use them in the radar system I manage and they are closer to 5K.
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You misread my post. I have replaced the rubidium clock with a BVA clock. A different animal altogether. Short term accuracy is an order of magnitude ahead of the Esoteric clock!
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Can you provide some more info on the BVA clock?
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It's a prototype built around an Oscilloquartz BVA8607b double oven OCXO mounted in a damped enclosure with a stiff power supply. A bit of a bench top prototype but not so difficult to turn into a finished product.
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Very interesting post. I've been creeping up the dCS stack...I know the clock and the clock cables make a BIG difference. I've used the dCS U Clock and currently the dCS Scarlatti Clock.
Clock cables i've tried are the stock dCS, Cardas Lightning 15 (excellent value and smashes the stock cables), Purist Proteous Provectus Praesto and now Transparent Ref XL digital. All BNC to BNC Speakers: Rockport Altair 2 Preamp: Robert Koda K10 Amp: Ayre MX-R Cables: Transparent Opus MM2 Spkr, Opus MM2 & Trans Ref MM MM2 Intcnct. Power Shunyata Triton/Typhon, Anaconda Zitron cords (x9) Digital dCS Vivaldi DAC & dCS Scarlatti Clock & Transport with Transparent Reference XL Digital cables Phono: Grand Prix Monaco TT, Schroder LT arm, Jan Allaerts MC2 Finish & Lyra Atlas, Nagra VPS/VFS Racks: Grand Prix Audio Silverstone F1 (x2) |
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Are u talking about the master clock or the reference clock ?
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