dave

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Everything posted by dave

  1. dave

    Help!!

    Can you short out the plugs at the far end of the phono leads plugged into the amplifier, if the buzz returns, you may have lost the ground continuity of your wires, unlikely but possible. Or even check them when an ohm meter. Or try some different wires.
  2. dave

    Help!!

    is the noise still there if you unplug the pre amp. You could also plug the amp directly to a CD, for example, player as long as you don't press play! and see if the noise is there.
  3. Abba Gold, on manky old cassette. Surprisingly good in a PRAT way
  4. dave

    To preamp or not

    yes in principle, but not necessarily so in practice (in my experience also). I have puzzled over this in the past. It could possibly be that not having enough appropriate stages to transmit the signal effectively results in loss of fidelity.
  5. dave

    What's yer bits'n'bobs ?

    Seems that it does....
  6. dave

    Whatever happened to DAB?

    I picked up a Philips DAB752 on ebay a while ago, i did not get on with it to start with but glad I persisted, I must qualify i only listen to radio 3, but I really can't fault it, I am sure better could be had but it has no obvious annoyances, (apart from totally manual tuning, i.e. entering the multiplex frequency on the key pad, and an annoying relay that keeps clicking, something to do with signal quality, and the power switch is on the back), with the sound I have some nice FM tuners but there is too much noise in my house, even with a distributed loft mounted aerial. (damn you cheap LED lighting) I also use a free view tuner in my other setup.
  7. dave

    Quad 405 2x been hacked about. Info needed!

    Oo sell it to me? I had a wanted in the classified... PM me if you want to haggle.
  8. dave

    The eternal CD player

    I was enjoying pondering another purchase of another semi functioning CD player, when it occurred to me that it would be more sensible to press ahead with my DIY cd player. This consists of a cd rom drive, the root of the eternal, as they are plentiful. Thats the theory anyway. With this end in mind I purchased several Teac 500 reference CD players cause they remind me of my beloved VRDS7 to use as a box. The plan, first stage: CD ROM drive ebay CD ROM drive controller ebay TDA1543 SPDIF DAC mounted in 500 series box. Then evaluate how good is the transport. Second stage Valve current to voltage converter. Third stage own controller firmware. I made a start today!!
  9. dave

    The eternal CD player

    How do you design equipment to be engaging? Or seductive? Kit that makes you want to listen, draws you into the music?
  10. dave

    The eternal CD player

    I'll start with a retrospective subjective of what happened previously. As mentioned above the sound has lots of good points and there is always lots to hear, but on extended listening, it just wasn't very interesting, well it was really quite boring actually. Puzzling, even with the snappy transients mentioned earlier. My only commercial amplifier that had several reviews in UK mags, one minor criticism in an overall quite positive review (recommend) was of its lack of adrenaline. It has been said that an amplifier's sound in some way reflects the personality of the designer... There is more to it than a flat frequency response... So I ended up not really listening to it.... I was not happy with the 100uf inter stage cap, I felt sure it was having a malign influence. Any way, it now has an almost completely direct coupled circuit, now working, most importantly the inter stage coupling caps are gone. I am not going to comment on the sound, just yet, have to see if it becomes the player of choice, or ends up back on the shelf... I don't completely understand the subtleties of the circuit at present, and there are definitely areas that could be improved, but let's hope it is good enough for the time being.
  11. dave

    Measurements, Compatibility and Ears 👂

    Hi, this is an accurate description of the sound you heard, but it was the sound of a complete system. I am repeatably surprised by the chameleon like nature of speakers and the way they interact with the up stream electronics.
  12. dave

    Measurements, Compatibility and Ears 👂

    I haven't looked at them yet. I replicated to an extent the first test, but naturally I don't have any qed 97 or whatever so used some 5a mains cable, compared to cat5. I may write it up in the measurements section, for entertainment purposes only, of course.
  13. dave

    Measurements, Compatibility and Ears 👂

    Just reading the audio science review discussion and contributions of Max Townsend. (2 pages out of 10 so far) Quite amused by some of the contributors comments, completely clueless, rather embarrassingly. That's just fine of course, it is all part of the learning adventure...😀
  14. dave

    The eternal CD player

    Finally put a new laser in the Sony CD XB930 QS enough to have a listen, still the occasional click, but good enough. Also got some new old Dovedale iiis. These have a simpler crossover than the 3s, so I had to check them out. I have refoamed and re capped them and put them in my valve rig. It was sounding OK, a bit bright and the treble a little ruff, but I put that down to the Dovedale tweeters, still a little suspicious of them, but clear enough sound, and very nice tight bass. Got out my microphone and checked the overall balance, gently rising with frequency. The PAT4 has some nice tone controls, so I was able to deal with that with a surprisingly little tweak. That resulted in a more satisfying balance, but still a little shrill sounding, so I decided to swap in the home brew CD player. It now sounds super lush a little down in the highs, and really rather disappointing bass. Kind of slow and muffled. So having had its arse kicked by the Sony, a little more work to do. I am going to try to make it direct coupled and remove the inter stage capacitor completely.... and surprised Dovedale iiis quite revealing in there own peculiar way...
  15. Hi, This fine, but perhaps try to differentiate this marketing BS from the experiences of users who are trying to relate an actual experience that they have had. I must say that I haven't encountered, personally, any adverts claiming revealing qualities, but that's just me. I have had the "removing a layer of hash" experience, several times, mostly and most obviously in SE valve amplifiers with speaker cables. The de-hashed system is more revealing, or more transparent as I like to call it. I have been comforted recently that it's not just me and that other people experience the same thing. I don't know what is going on but I very much suspect that I could record the difference with a microphone, so it must be measurable. I suspect software analysis of some kind could extract some numbers. Not my specialty unfortunately. 😀
  16. This makes me wonder if a definition of revealing should have be agreed upon at the beginning. When I read the first post I imagined Mr shadders was wondering how to set up a revealing system I.e. one which allows one to hear the difference between interconnects, for example.
  17. Bit late to this thread but never mind. Hi Mr shadders. I perceive some level of electronic engineering experience? I am an electronic engineer, and an incurable tinkerer, which has led me to try some off the beaten track er, circuits and random idea concoctions in my stereo, and hence stumbled upon the quality you ask about. My first home brew amps, very simple class A no feedback. Got some Genexxa lx5's (time aligned 1st order crossover) with a nice benign tweeter, on ken Kessler's recommendation. Having studied RF at uni, made some active 50ohm terminated interconnects. The 50 was not important, but the peculiar (folded cascode) way I implemented it. I Got a job in a hi-fi company, who's designer was aware of the Max Townsend Low inductance speaker cables. Made some. At this point my little stereo was sounding pretty good. (About 1995). Been around the block a few times since, but certain key ingredients from my perspective. Low inductance speaker cables. Low or no feedback amplifier of reasonable performance. Some time aligned speakers are helpful but not essential. And to a certain extent another unknown variable is, I like to imagine, some electrostatic type of environmental factors which along with temperature and humidity seems to have a profound effect on the perception of the.sound. don't have much control over that, but when the stars are aligned this makes it easier as well.
  18. I bought these upon finding out that they have a different crossover from the 3s (the latter version). They are re foamed and re capped, and remedial repair to the back of one which had been wet. It is very unusual to find these re foamed. Most have stiff rubber, and sound ok, but lack the bass extension. A bit tatty but pretty solid overall. I love Dovedales but don't need 3 pairs. Good sound from the low power valve amp. £150 Ono collect from Cambridge.
  19. dave

    On the bench today.......

    Self indulgent thread of half built home projects and repairs.
  20. dave

    On the bench today.......

    My this is turning into a drama. Been working for a couple of hours and sounding good and then just died rather abruptly mid track....
  21. dave

    On the bench today.......

    Back again. Thank goodness. For some reason it had blown the fusible resistor for the display, and the puck was not in, so it did not look alive.
  22. dave

    On the bench today.......

    Oh no. It's dead. Sulk second. Put it back together and accidentally left off a power plug on the audio board. Including this sad development incase anyone else is thinking of doing this....
  23. dave

    On the bench today.......

    Finally got round to putting a new laser in to my Sony CDP xb 930 qs, bit fiddly but now plays a disk that was a bit of a disaster before. 😀 All the transport mounting pillars are split as well, so trying to glue. Not very optimistic, looks like someone else has been in before. eBay seller (dealer) said he sent it to Italy in a working state, and then got it back claiming it didn't work and it had been dropped..... Cross fingers, looking forward to having a listen, the electronics look quite nice even though the transport is a little uninspiring under the hood.
  24. dave

    Man caves...

    I think 30m2 max without planing permission.