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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hi Romy,How about building a mezanine floor (or two), with a nice wrought iron spiral staircase - surely koshka would enjoy that?Best,cv...
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Let's just pretend for the moment that you haven't heard the particular TAD driver Kevin is using , and consider the possibility that for at least for some portion of its frequency range, it has a tone similar to the S2 - perhaps it uses an alnico ma...
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No, the 1443 is also a field coil, just a different voltage.Re: the configuration - indeed; I am hoping to get 300Hz with the RCA, then the S2 from between 1k-1500 and up, + tweeter. Below the RCA willbe a compromise to begin with, but hope...
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Without wishing to open a can of worms....Mine are the 1443 - same as the 1428B save for the field coil voltage. I've finally got round to ins talling some of Cogent's replacement diaphragms to restore them properly. I can't say enough good thing...
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Ah yes, sorry - that wasn't remotely clear. The drivers I have played with briefly are S2 and field coil RCAs, both have the same 1.5" throat. I was referring to my initial impressions of the sound on Martin Seddon's 160Hz horn (T=0.8 JMLC). Previous...
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Well, I was thinking that there might be something of a "shock wave" created if they run too low, and the pillows might soften that up, almost as though one were trying to get the horn to behave more like a direct radiator at LF, where there is not e...
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Hey Romy,Did I ever mention my sulphur hexafluoride idea to you? You fill a horn with this gas, sealing the front with some loose fitting heavy grade mylar or whatever. The horn can then be 44% of the size you'd otherwise need.That said, this approac...
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How about shunting the 1H choke with 180K or so and changing the 20k to 22k5.... that's a rough calc (should redo for standard values)... will keep the x/o point the same and eat up a decibel......
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AlloOn the matter of the DHT having a plate resistance of 500-700... you do realise that running the 6E5p with an unbypassed cathode resistor is giving you an effective Rp of about 12k, right? The formula is, IIRC, Rp + (mu+1)Rk.Given that 12k seems ...
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Hello Romy,I've only heard the 801 in class A2, but I can easily imagine that the 10Y or 801 with nickel output would offer the purest possible sound in the 1k-10k range, such that it is the S2's true voice you are hearing. It's something I'm going t...
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AlloOnly the cheapo Shure see-saw... perhaps I can improvise a balance to check the weight.I thought about the compliance business, as the HK diaphragms look like the surround embossing is narrower, which would make them less compliant (if they are a...
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Hi Romy,I knew that would be your response! It's definitely a case of (1) or (2) though. If he had been upfront about them being new, and not that he found them in a cinema, that would have been another matter. Also, I believe Mike Harvey owns the ri...
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For all S2 fans... please be aware that seller "milesvintage2007" was claiming to have found a load of diaphragms in an old cinema (yeah, lots of those running Vitavox in Hong Kong, I'm sure...*)Even forged the labels on the tins... He has since remo...
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I have some theories...*please* keep this tube safe, we will have to run some curves on it...More importantly, it's a good thing the output transformer wasn't damaged, though I'd imagine the tube would have struggled to pass more than around 600mA an...
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Sorry I'm a little late here, but anyway... here's something that may worth trying. Apologies that I can't provide a schematic at the mo - I can sort this out later if you like. In the meantime, you'll need a pen and napkin to help visualise this:The...
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I think these guys have been mentioned here before, but it looks like they might be able to oblige - at a price, I'm sure:http://www.hornfabrik-eder.de/holzhoerner.htm...
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HiAsk Dave what he thinks about 2:1 or 3:1 step down ratios....If you did go 1:1 you could go bifilar...Btw, did you consider fixed bias to the output stage via the interstage secondary?cheers...
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Why not tap the filter choke (the 1H ahead of the driver) ie use a 1H autoformer... given the gentle loading presented by what follows, it shouldn't mess up other stages, no?cv...
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Yes, well - I wasn't really saying much; just a vague hypothesis. There is some tendency for lower Rp tubes, (and somewhat related) tubes with a certain harmonic structure, to sound more romantic, and hence impart that quality to music regardless of ...
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HelloDo you mean 78% nickel? As it's Dave's iron, I'll even *pay* to take it off your hands :-)Re 10Y: Well, it's one of the most linear tubes ever; and this has been backed up in some brief listening experiences to some of its variants. A friend act...
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Ah, splendid!What's the exact spec of the opts? I will gladly relieve you of them if you're not impressed!On the other hand, if you are, then you will have the dilemma of how to get mumetal opts on the other channels... but having almost zero time th...
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Romy,I'm not sure how "transparent" you find the Lavry etc AD/DAs, but since you have them, it might not be difficult to throw in an adjustable digital delay; eg these chips from TI http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=ana...
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Allo gents,not sure if you've seen this:http://www.pmillett.com/etf_sod.htmhttp://www.pmillett.com/file_downloads/ThesoundofDistortion.pdf
Pete devised a circuit whose distortion order and level could be controlled. It was for educational purposes b...
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Hello Romy,While you are in test mode, have you played with bath towels around the horn mouth? There's a long thread here by Jack Bouska; you may or may not agree with the content, but interesting how towels make hifi news sound better (if not more t...
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Couldn't agree more about the b/s around this concept. A pal of mine agreed, and put it very succcinctly: He just said, "Aye - variances add".cheerscv...
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Completely agree... but there is one possibility to get the inductance up without increasing the turns; use a smaller airgap in the OPT.This will tend to saturate the thing sooner for a given current. BUT there is a trick that has been successfully e...
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...yes, I remember. I wonder if it's due to the large (and varying with signal) capacitance of the 6C33 input interacting with the small coupling cap. Hopefully this will be less of an issue with the 6e5p/6p.cv...
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Romy,Are you currently implementing "nominal" 3200Hz x/o on the mid range channel S2 using a cap at the driver? I know this works nicely to ameliorate the "secondary" resonance of the plastic edged diaphragm.Reason I ask is because things may not wor...
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Hi Dima,Thanks for your comments; please forgive the chaos of what follows as I have to rush!
Agreed on all counts - the dc bias point would need adjustment and monitoring; I supposse it depends on how stable the electricity is from the wall; anothe...
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Absolutely, yes - I've never tried this scheme and I am not confident about the sonics. Given the demands of a 6C33's grid - and this "on paper" - I feel the results might be better with a cathode follower after the levle shifter. I any case, would l...
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