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dave

MEGASTORE MEMBER
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About dave

  • Rank
    incurable tinkerer
    Veteran Wammer
  • Birthday 23/11/1969

Personal Info

  • Location
    cambs
  • Real Name
    dave

Wigwam Info

  • Turn Table
    Pioneer PL L1000
  • Tone Arm & Cartridge
    Shure M97xe
  • SUT / Phono Stage
    834p tweeked
  • Digital Source 1
    eternal cd player
  • Digital Source 2
    Sony tv tuner
  • Pre-Amp
    tubed dynaco PAT4
  • Power Amp/s
    TdP 6080, moded
  • My Speakers
    diy Dark Night
  • Trade Status
    I am not in the Hi-Fi trade

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  1. Me too (with minor reservations), predominantly as I am not seriously into external DACs (at the moment) so haven't spent much time fretting about them. It would seem to me today, two mechanisms of degradation of the audio over USB: Actual uncorrected data errors that would vary in audibility due to the number of dropouts, presumably caused. Conducted RF hash getting in to analog (and digital) circuits causing intermodulation. Life was so much simpler when we just had to combat wow and flutter and rumble...... Or maybe not :).
  2. Yes, but they are cool and it looked like it still worked. Never mind.
  3. Here is an interesting (techy) read on this subject: https://www.audiocircle.com/index.php?topic=148763.0 Next time I look in to one of my DACs I will look to see if it has an accessible CRC error flag, a bit like Stan Curtiss's Quality Assurance Module box for the CD1. Would be helpful in getting some clarity on what's going on. https://www.hifinews.com/content/cambridge-audio-cd1-vintage
  4. Old low power valve amps can go on for ages, I have a c1967 ECL86 SE amp still running with original valves, the only thing that has failed is half of the power switch. Unreliable - hot running post ROHS BGAs.
  5. Sad days, did you rescue the counter?
  6. If its an IR remote, point it at a digital camera / phone and see if the IR transmitter lights up when you press buttons.
  7. Please consider me among the currently befuddled. I am not saying that power supply doesn't make a difference, I am saying that I don't see how feeding ultra clean analog smoothed and massaged power to a digital circuit makes any difference to its fundamental operation, with perhaps the exception of small amounts of clock corruption, to lead to fairly small changes in subjective sound quality. I do hear people saying that the "quality of the power" does make a difference (once upon a time it was cables remember). And I do know that some switching power supplies radiate copious quantities of RF crap. I would like to try and understand what is happening, because I am an engineer and I like working things out. And I joyfully declare my complete lack of first hand experience of this phenomenon, as a late adopter, but most of my kit is valve and may be fairly immune. I tend to listen mainly to Radio 3 over DTVB, or other sources through a chrome cast and the aux out of my TV, surprisingly good actually, or very rare occasions USB soundcard / DAC plugged in to PC. So I can only theorise at the moment, and maybe if some thing I say strikes a chord, some sort of consensus may be arrived at (by me at least).
  8. I theorise that some equipment is more susceptible to "power supply noise" than others. It would be helpful to the discussion if there was some clarity as to what equipment is being used. It seems to me that Mr Pilsonaught's kit good and mostly valve, and it does not surprise me that he has not heard any difference (yet). IMO as a gross generalisation the power supply for a streamer type device (pleas excuse my ignorance of all the variants and nuances of digital sources, I am a late adopter) should not make any difference to its operation (as long as it working in spec etc), but we are suspecting that if it is kicking out lots of electrical hash it may effect other equipment down stream, particularly DACs and I would imagine some solid state preamps and amps. I know one could look at the equipment listing but, to me "I heard a huge difference between PSU X and PSU Y in my solid state system", or "I did not hear any difference in my valve system between PSU A and PSU B" could be useful, otherwise everyone is confused and round and round in circles. To take it a bit (unrealistically) further even, one could compile a list of kit used by those that can't hear a difference compared to those that do, and see if there are any common factors? Not volunteering.
  9. Felt like a loud, around 80db, peaking at 84. Won't go any louder, and my under powered sub subs (80watt) saturating a little. And that's with a 3.5 watt valve amp above 200 Hz. Comforting that I am not alone in my subjective / objective impression of loud. Back for some more, kick it in...
  10. Yes, that's what I meant. Ok, maybe he used an empirically derived, heuristic methodology😁.
  11. I don't know if there are any of those £25 tripath amps available these days.
  12. With my engineer head on, pass. I suspect there must be a degree of try it and see, by someone with good ears and experience. I suspect that you would not glean much from looking at a circuit.
  13. Yes, a capacitor with rectified mains, that provides about 370v DC in the UK. That powers the switcher, most often rated at 600v dc. Stressful. Needs to be done right, or it will go off with a good bang if it fails. Linear supplies, the capacitor voltage is much lower, LPS would typically smoulder if a fuse did not get in the way first.
  14. Designing a good SMPS is not easy and there are a lot of things to consider, whereas almost anyone can hook up some linear regulators to the rectified output of a transformer. That is why their are not that many available imo. I dabble in SMPS in my day job, and it spills into my home projects, my valve preamps, and home made valve CD player(s) use SMPS for the HT, and sound good to me. I am considering the HT power supply for a, big by my standards around 100 watts, for a SE valve amp and a SMPS seems would be a good way to go, for the HT. But a bit scary, but benefits of easily adjustable voltage and multiple taps, and hum free out of the box does seem attractive, along with soft start etc etc. It is fairly easy to filter the noise if the design is done right, as the Ls and Cs are so much smaller compared to a Valve 50Hz supply. Where there could be a good symbiotic relationship imo, is between the class ab amplifier and the SMPS. There are lots of ways they could be carefully designed to work harmoniously together to improve performance and reliability.
  15. I am a great believer in testing my ideas / beliefs of circuit design / layout. That does mean that I fall flat on my face sometimes, but if I learn something that I didn't know it is usually progress. I have a low level hum to fix on this thing (valve quad 34): I am pretty sure its that black and blue wire at the back.... But it might not
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