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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="Paul S"]There is also something to be said for continuity, so one does not wind up with a lot of "optimized" parts. I wonder whether having a different tube "signature" for each "channel"/driver would work out.[/quote]Absolutely. It wa...
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The other possibility is that the MF issues can be the problem with the JBL 2441 rather than the amplifier, and it would behoove me to explore the Vitavox driver.
Adrian...
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[quote user="Romy the Cat"][quote user="drdna"] You are correct, though I believe the subwoofer covers only below 35 hz. [/quote] So???[/quote]So, my thought was that below 35 hz, there are many ways of thinking about amplification. Some might say S...
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[quote user="floobydust"]As Romy pointed out, having high gain is not the same as power. If you're only barely cracking the volume control on your amplifier or preamplifier then it should be obvious that you have more gain than you need. If you're p...
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[quote user="Romy the Cat"]You use Edgar’s refrigerator subs that use own LF SS amps (that use EQ of I am not mistaken), so you do not use the full advantage of SET LF sound.[/quote]You are correct, though I believe the subwoofer covers only below 40...
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[quote user="Paul S"]I have begun to see a pattern of diminishing net returns with respect to the smaller SETs, to the point where I wonder if their "potential" can ever be practically realized as Music in Full Glory. Lastly, the choice of an ou...
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KM:
It will be a little project to modify the amplifier, but it may be educational. To optimize the Moondog circuit for the NOS 2A3 tubes, so they will give their best, I plan to buy a new OPT with primary impedance around 3.5-4K. Will that be s...
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[quote user="floobydust"][The Moondog amplifier has] a higher B+ voltage (350 volts) with a 1K cathode bias resistor and the 2.5K load.[/quote]
[quote user="Romy the Cat"]...the most proper operation of this tube will be at 275V on plate and 4.1K ...
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[quote user="floobydust"]If you do some modeling you're running about 15.5 watts of dissipation on the plate and pushing over 4.5 watts output. Running the higher B+ voltage (350 volts) with a 1K cathode bias resistor and the 2.5K load results in hig...
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[quote user="floobydust"]Running the higher B+ voltage (350 volts) with a 1K cathode bias resistor and the 2.5K load results in higher distortion than the text-book operating point, which is B+ of 300 volts and a 750 ohm cathode biasing resistor and ...
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First of all, this not an attack on NOS tubes and it is all meant to be just sort of fun and educational. I happened to have all these 2A3 tubes side by side for comparison, so why not? I also have done the same thing with other tube types like 6SN...
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[quote user="Romy the Cat"][quote user="drdna"]However, there is no comparison to the expensive tubes from Kron, Sophia, and Emission Labs. These are all in a separate category. These produce a very different sound. It is like this: on the old black ...
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Okay so I got the NOS Sylvania "Spring Top" dual filament 2A3 tubes and have been listening to them for a while, now I am ready to make a report on the tube.
The tube is well built and structurally sound. Tapping gives a very small "tabla" sound ...
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I think this subject should be collected in its own thread. It is interesting that both Romy and I have just got the Behringer DEQ 2496 to try in our systems, so hopefully there will be some data to report here.
It was previously said that the DE...
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[quote user="Romy the Cat"]Funny I thought that that for MiniMe it would not be so critical but as soon I plugged the DEQ-2496 in MiniMe pass I have heard that depersonalized DEQ sound.[/quote]It is funny how some people seem to not hear this at all ...
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[quote user="Romy the Cat"]My few period DHT tube all have this springy sound but they also has a long decay of rattling. It is like string attached under the bottom of the drum and when the drum sound dies away them strings continues to vibrate. I ...
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[quote user="Romy the Cat"][quote user="drdna"] In my mind it is fairly straightforward: stereo = two channels. Two channels = two point sources.[/quote]There are many more or less properly operating in Stereo mode installations out there, you can li...
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[quote user="Romy the Cat"]The contemporary productions DHT tubes (Russian of Chinese) are superbly firm and have no internal noise when they shacked or hit. The mintage 60 years old tubes what you make the “close to ears” test responses like as some...
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[quote user="Romy the Cat"]Do you remember I pitching the notion that the distortions themselves are not auditable but the mechanisms that create distortions are auditable. So, following it I would state that the vertical separation of let say bass a...
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[quote user="Joe Roberts"]I am past fetishishizing on gear and detailed quasi-scientific evaluation programs. I am a music listener again. All I care about, really, is my individual enjoyment. I am not comparing live vs. memorex. I am criticizing t...
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I am NOT going to buy a new set of KR 2A3's just to compare to my "vintage" ones, especially considering the price has gone up to $800 a pair!
However, a NOS pair of Sylvania "spring top" 2A3 tubes is on the way to me. So I will have some things ...
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[quote user="Joe Roberts"]It is unnatural to think about these things while listening to live music, so why switch when listening to a stereo? [/quote]I think about these things because I am listening to a stereo. The recording and reproduction of t...
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[quote user="Romy the Cat"][quote user="drdna"] Try a simple experiment. Connect only one driver at a time. Listen only to the ribbon tweeters. Now listen only to the woofers. Etc. Can you distinguish different heights for the image? [/quote] Of caus...
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[quote user="Romy the Cat"]Nope, I of course do not do not deny out ability for vertical allocation of sources but I do deny it in context of a loudspeaker with properly integrated drivers. I might recognize some degree of vertical HF imagine shiftin...
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[quote user="Romy the Cat"]it happens ONLY in the inhalations with improperly integrated drivers. The entire subject of the “improper integration” shall get rid of this possibility. I know that you use EdgarHorn and what I heard it at its best I did ...
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[quote user="Romy the Cat"]However, in audio the coordinate system is not geometry but hearing and human hearing is not equally-dimensional. Humans, juts because the position of ears on heard have much higher sensitivity to horizontal sound source he...
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[quote user="Joe Roberts"]I would argue that the notion of point source is not the important thing about single driver speakers.[/quote]But we have all heard the difference, with standard stereo installations, where the bass comes from down below and...
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[quote user="tuga"]I really meant to illustrate the fact that Point Source does not exist in "real life" and that it's analogy with a single driver makes no sense (then there is the question of live vs. recorded-and-then-reproduced sound and live sou...
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[quote user="drdna"]Thanks tuga. It is a nice article, but my French is a little rusty. It seems that he does very little more than explain the limitations of stereo versus binaural reproduction.
From this came the schools of thought of quadropho...
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[quote user="Andy Simpson"]This type of test is more commonly called DFD (difference frequency distortion) and is sometimes used in microphone measurement to measure acoustic/mechanical non-linearity.[/quote]This is interesting. What physical methods...
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