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About dave

  • Rank
    incurable tinkerer
  • Birthday 23/11/1969

Personal Info

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Wigwam Info

  • Turn Table
    Pioneer PL L1000
  • Tone Arm & Cartridge
    Shure V15 iii
  • SUT / Phono Stage
    834p tweeked
  • Digital Source 1
    eternal cd player
  • Digital Source 2
    Teknica tv tuner
  • Pre-Amp
    tubed dynaco PAT4
  • Power Amp/s
    diy Fast Class A
  • My Speakers
    Wharfedale Teasdale
  • Trade Status
    I am not in the Hi-Fi trade

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  1. I think toroidal transformers don't like unsymmetrical waveform and that can make them buzz. EI types can cope better. I have seen mains regenerators advertised that could help.
  2. Drifting resistor values? Have you tried measuring it, burn a tone cd or play computer through at 100hz for example, and use a multimeter set to ac.
  3. I have been lead to believe that some players like the Philips cd723 are not bit perfect, but I would imagine most are.
  4. dave

    A mystery

    Looking at the respective output / DAC circuits in isolation, in most HiFi / half decent phone upwards you would be hard pressed to tell the difference, I would like to think. Unless it has valves in of course. On a tangent i am listening to a £20 technika TV tuner tuned to radio 3, ok it looks like an 80's clock radio, but the sound is acceptable and at least as good or better than any other radio receiver I have used, except streaming through a decent DAC perhaps.....
  5. I have just done a mod to my quad iis, I think it sounds better, but it might be expectation bias..........
  6. I made a valve tester once that could measure gain, as well as transconductance etc. Things called ECC83 /12AX7, the gain typically varies between 90 and 100, mullard being 100 and more "eastern" derived tubes 90-95 as a general observation. There was one that had a gain of 130, which confused me no end when I was designing the tester. These kinds of variation ought to be audible, if subtle.
  7. I find that the sound of my solid state gear is highly variable and quite often takes a while to come on song. I have some active speakers that probably had not been used for some time before I got them, it wasn't till I ran them all day that they really got going, they sounded a bit anaemic before. Where as the valves, a few minutes perhaps, solid state can take a half an hour to a few hours in my observation. I haven't worked out why yet, but it is probably something to do with electrolytic capacitors You do have my complete sympathy and empathy incidentally, you sound a bit like me thinking about buying a (second hand) car. I hate it. I am an electronic engineer, and I used to think that transistors and valves were equivalent and interchangeable (conceptually at least withing there respective ratings), and it was really down to circuit differences that made the sound. Then one day I had a road to Damascus experience, and realised that no, it is not just that valves sound better, in an identical circuit swapping between a valve and a transistor, the transistor sounds worse, i.e. not neutral, actually a little unpleasant. I found it quite annoying as I spent the previous 15 years working on my designs of solid state gear.
  8. My little SE amp is still using its original 1960's valves, I also have (pre loved Hitachi iirc) 60's valves in my EAR 834p, it does very much depend upon the amplifier in question and the priorities of the designer. Transistors can fail over time, the internal connections can fail due to thermal cycling stress. Quite a common problem in particular with some 80's Technics amplifiers.
  9. Isn't it like a capacitor er condenser microphone? I remember an old valve record player taping the ceramic cartridge screened wire made an unpleasant scrunching noise from the speaker.
  10. I am not bored with my hifi, probably the main long term advantage....... I have been running, getting on for 10 years, a late 60's stereogram amp (de cost reduced a bit) into a pair of re foamed Wharefadale Dovedales 3s. They sound lovely. At the other end of my office some NS1000s and a Sony TA F730es, that's lovely as well, but in a more cerebral visceral way. The valves and Dovedale's get used a lot more, bit like some comfy slippers, but they do bass and dynamics on a slightly limited scale but loud enough for most normal listening, about 3 watts. The stereogram amp's bass is better than the Quad ii's curiously.
  11. dave

    Gorgeous Gadgets

    Working at last. I got these a few years ago, bare bones style, bit tatty, but I quite like that. Done enough to stop them self destructing, and de-tuned them a little, about 15watts, and using about 75 watts each. Industrial art imo.
  12. original Previa, surprisingly comfortable smooth ride especially in the back.
  13. On the crudest level turning up the feedback will lower the output impedance, so if the impedance curve of your speaker is relatively benign i.e. like a resistor the frequency balance will remain fairly stable, if however it is all over the place expect some degree of variation in frequency response, which may mask some of the more subtle effects. As you are making your own speakers(?) you have some control over that.
  14. It will probably behave like a kind of tone control, but not tone in the conventional sense, maybe timbre, fun and educational thing to play with. You may find a preferred setting or find some recordings prefer one setting, and others prefer another..... Entering the mysterious zone of amplifier voicing.......