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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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"Practically it is horrifying in the very tiny world of lower bass’ tonal and dynamic discrimination. In fact, it was not only there but pretty much everywhere and it always filtered out something."I wonder if it is the reactive components (blo...
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I think we are all agreed that if time alignment and space were not issues, a bass horn would be the way to go.Now, I'm fairly convinced that the overwhelming benefit of horns in this range is the phase response, ie flat group delay vs frequency. Mos...
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AlloWell, I hope I wasn't threadjacking too much; as far as I see it, the best case for digital processors is for messing around with the time domain, not for x/o'g. Ah, so you feel a bit of phase shift at LF is beneficial... interesting. I've a...
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Nice posts Romy and Jan, agree almost 100%. I've heard the Behringer in an originally crummy system and it butchered things completely. The input levels were low, which as you point out, won't have helped at all.On a vaguely related note: I dunno if ...
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How about lead acid batteries :-)Only half kidding - they would be cheaper than the caps and just think, you could finally ditch those AC power troubles away.Also the amps would adore the super low impedance power supply... Still, what with that enor...
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Well, I have little comparative experience of this cos the required chokes get huge and expensive, but some people I trust swear by low DC resistance chokes; they feel that this parameter is so important that they will sacrifice inductance to achieve...
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This will be very interesting indeed... that is an enormous airgap and will make for a very linear and unstressed hunk of iron. You may wish to apply similar tactics to the power supply (low DCR inductors) if you want to be really surprised...Which r...
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Allo TAh, I think we are agreed on all counts. The suggestion of low bass via the deliberate introduction of its harmonics is something that has been done with guitar amps since way back, even if it wasn't the original intention...cheerscv...
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AlloT wrote: "Absolutely. Making a transformer for < 100Hz would mean to use a huge core and a fairly large airgap to get more inductance at a given standing current. This makes winding the transformer with low parasitic capacitance and low leakag...
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Alas, no time for anything at the moment, the listening valuation must await construction of the amps (and speakers...)Also, it is a very custom application - it is designed to drive an array of ribbon tweeters. Normally these have matching transform...
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Ok, so should be burned in nicely. There are some theories around how mylar and similar interwinding materials (as used by Lundahl, if that is the OPT you are using) can need a fair bit of run in. This is more of an issue on eg input transformer...
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Intriguing Romy, look forward to hearing more.Before you go raising the plate voltage, you might want to give the OPT a chance to break in, particularly if it's new and especially so if it's an amorphous type...cheers...
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chaps,I found the design details; it was posted by on the Joenet a few years ago.Basically, it involved making a vertically sectioned bobbin; start with a 70mm diameter cylinder of whatever material (I used white nylon cos it was available and cheap;...
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Alas, not much time to deliver the promised treatise...So, tantalisingly, I will suggest this; for the range 1k up, you would have no problem getting a small mumetal OPT made suitable for the 6C33/S2 combination. Actually, I have something simil...
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Allo Romy,Big topic this! I will write something suitably detailed when I get a chance this weekend, but you're right - the transformer is key and one that is optimised for the task in hand is absolutely the way to go and something that not many peop...
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I'm way out of my depth here, I think I know what you mean Romy; my own feeling about Mahler is that just when he's developing what could be the most haunting melody or lyrical phrase he gets bored with it and goes off on a tangent. Not always, of co...
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...that rendition was awesome. I actually think it sounds a helluva lot like Jimi, even if the motivation and times are different. From what I gather, he wasn't necessarily making the grand statement about Vietnam that many have assumed was the case....
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Ah, those figures seem more reasonable - 30pF seemed a bit low. Well, I'm not sure what you should be on the lookout for - as you say, it's a completely different animal to having a 3uF in line with the S2. What I would suggest, and this isn't ...
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... it may well work superbly. Where it may not be ideal - well, let me explain. The Miller capacitance is not constant but will have some dependence on level (this effect is much more pronounced in silicon). If we feed the valve from a small capacit...
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I too have thought a while about exactly this... there is something that troubles me deeply though about this approach. I have a theory that too small a cap may not work out as well as one might hope. Now, shall I do a Romy and delay revealing my tho...
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Hmmm - the whole LCR thing, I don't like the idea. I'll admit to having no experience of it, but in engineering terms, it just gives you a constant impedance filter. The EQ is still done by caps essentially, far as I can tell. I see the wh...
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Allo Romy, I have no idea about the above - my gut feeling is that the required thickness of material would be too great, still, I bow to your experience in S2 mods. I just wanted to mention something that came to mind that might be of interest: I re...
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Allo Romy, Air core caps? Good man! Are they for trimming or the primary RIAA? The way I see RIAA equalisation, there must be some optimum tradeoff between high R and low C (low value caps are always nice) and low R high C. Why do we want low R? A f...
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