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About Ittaku

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  • Birthday 02/03/1970

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  1. Ittaku

    Magnapan speakers

    Indeed, though I think there would be much more choice in amplification today than there was back then.
  2. Ittaku

    Magnapan speakers

    Anyone want to comment on the sound differences between the legendary but long since out of production Apogee full range ribbons and the Magnepans? It's the seductive sound of the Scintilla and Duetta ribbons that made me originally look into the 'pans but they never quite seem to have recreated that magic I once experienced (though it's been decades so memory may be romanticising things a lot.)
  3. Ittaku

    DSP options

    Highly recommend the DSPeaker devices for standalone room correction +/- DAC +/- Preamp usage as an all-in-one box. The base model "dual core" device will accept up to 96kHz/24bit data but internally it runs at 44 or 48 depending on the source, and can be used either as the endpoint DAC, or have its digital out used to chain to another device. Similarly the "X4" device which is their flagship product accepts up to 192/24 but internally runs at the native rate up to 96/24 max; in addition it also has active crossover built in for subwoofer if need be and is actually a very good DAC but is much more expensive. These devices do most of the guesswork for you, they come with a microphone you put in the listening position and do an automated room test and correction procedure. You can then fine then them further with your own equalisation. I've tried to recreate their performance with a software solution on a PC and even though I can achieve a flatter frequency response, it doesn't ever sound as good. They seem to have the balance right of avoiding boosting nulls while levelling off peaks much better.
  4. Oh I see. No I have Audio Research Reference 250SE monoblocks. The small signal tubes are 6H30Pis, which there is also very little scope for rolling (though I guess I could get Reflector 6H30p-DR) . I'm pretty happy with the ARC selected tubes they use, and they're allegedly good for 6000 hours. The other tube in the complement is a 6550WE used as a voltage regulator. My experience with altering voltage regulators is they have zero effect on sound.
  5. What about them? I don't have one. Like most preamps, the valves should last 8-10000 hours. I don't know what type of valves they have though.
  6. Wasn't drawing any conclusions, but it's true there are lots of valve rollers.
  7. Not that many votes yet, but the valve rollers are way in the lead. I had a feeling that might be the case 🙂
  8. Ittaku

    What creates Imaging/sound stage

    Sound stage is complete artifice created by hi-fi. If you saw the way music is actually recorded with multiple microphones close up to each instrument and then mixed up the wazoo, you'd know that the presence of instruments in a soundstage left to right, front to back, top to bottom, doesn't remotely resemble what went into the recording. It's extremely rare for even acoustic classical instrument recordings to even be done with two microphones your speakers' distance apart (or headphones.) Classical has microphones suspended in the air above the instrument at optimal positions to catch all the group of instruments equal magnitude and are also mixed to then try to recreate approximately where the instruments were left to right during playback. None of this means it isn't worth recreating in hi-fi, though, as the whole point of mixing is to try and create this soundstage. It is the artists and sound engineers' visions of what it should sound like. However don't be fooled into thinking you are actually recreating what went into the microphones unless you're listening to something like a Mercury Living Presence or RCA Living Stereo recording. Considering the soundstage of a heavily mixed multi-mic'ed recording is virtually indistinguishable from a two microphone setup like those, it's an impressive feat.
  9. Ittaku

    What creates Imaging/sound stage

    You'll find this article very interesting and relevant. https://www.stereophile.com/content/gramophone-dreams-26-nelson-pass-harmonic-distortion The important part is that Nelson Pass was handing out 2nd harmonic distortion boards for people to play with. Note that valve preamps tend to have 2nd harmonic distortion. I quote the most important part below. When you turn the knob to the left, which is negative-phase second harmonic, the room gets bigger, more atmospheric, you start to see images of musicians. Turn the knob right, you get positive-phase second harmonic, which brings the musicians closer to you: drier but more intimate, more apparent detail. But of course," Pass reminded us, grinning hugely," this is all illusion!"
  10. Love the KT 150s to death. No way am I giving them up 😊
  11. KT150s. Precisely one manufacturer...
  12. Oh I don't get much choice in what valves I can use which in many ways makes my life easier. I'm just curious what others do. I quite like the matched valves that have been burned in for 72 hours and then tested and matched since they don't drift (upscale audio.)
  13. I'm pretty sure valves can underperform long before they're so bad that they can no longer be biased, but yes bias requirements drift as they age.
  14. I'm aware that thermal cycling is just as important as, if not more than, the number of hours the valves have been powered. I'm particularly vigilant with only switching them on/off once per day and prefer to leave them on for a couple of hours if I'm going to not use the system over lunch etc. and plan to go back to it. Here's the ancient reference I've quoted here before: https://audiophilereview.com/tubes/leave-it-on.html Nonetheless, I'm still curious what people like to do themselves
  15. Looking for a discussion from people who've had valve amps for many years as to their valve replacement strategy. I know that many of you won't know exactly how many hours the valves have been unless your amp has a tube hour counter, but just estimate approximately how long it's been - though there's a good chance such an estimation could be wildly off.