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In Reply to: RE: Old, Old Dac posted by ahendler on August 15, 2015 at 14:06:58
Easy possible eason ; your Audio Note transport is S/Pdif. The DAC from 1983 isn't as S/Pdif wasn't a standard until 1992 (1998 for current version). Hence they won't lock together in a stable manner.NB: I have an old Sony transport which is pre-S/Pdif. It will lock to some later DACs but mostly not.
Edits: 08/16/15Follow Ups:
But why does it lock initially for a few minutes before failing if what you say is true?
Alan
I would need to knnw far more than I do about the inner workings of S/Pdif to answer your question. However it is possible, for example, that a close but inaccurate synchronisation of components will not be acceptably stable over a period of time leading to an eventual loss of lock between them.
I can reproduce this situation by using different and out of synch clock signals for the DAC and for the source. The selected frequency for both is correct but not the timing in relation to each other. All will seem fine for a period but eventually and inevitably a glitch will occur. In your case this may manifest itself as a loss of lock.
Just surmising.
It sounds more like the DAC's power supply is only moving the signal as long as the capacitors allow the signal to progress. At some point they simply don't have enough charge In them for the circuit to work continuously !
(Now don't laugh too hard but I'm really not a technician,so this is only a non educated scenario on my part, but it sounds feasible given that initially things work)
I would look at PS caps too.
E
T
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