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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I would like to offers some thoughts about possible avenues for Pure Power 2000 improvements. Those thoughts are no specific to the recent November-December events and have broader generic implication. I initially intended to write it to Pure Po...
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And The first thing I did was I grabbed the multimeter and started measuring what JJ suggested. I think we're on the trail of "something". I discharged all the capacitors in the amplifier and with the amplifier turned off, when I put the red tip ...
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[quote user="morricab"] Interesting test you have conducted. Were the responses mostly unflat near the frequency extremes or was there variations even in the midrange? The reason I ask is because if you look at most of the published curve...
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I spent a bigger part of day today to finish the “End of Life" Phonostage, there were many things to do but it is now over. Done! Complete! Amen! I it closed up and sat in it’s permanent place.
A few observations looking back. First, I spent a LOT...
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[quote user="PurePower"] In the world or audio you learn new and interesting facts every day. AC caps (ceramic, electrolytic, polyester and polypropylene metallized foil types) can buzz at various frequencies. This is not nonsense, and is quite...
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[quote user="Romy the Cat"]Good link, Kris. What is missing in the link is the RL filters. The RC Low-pass filters are fine as the capacitors are not in the band-pass mode. It is arguable what would be better – a subtractive shunting cap or a few mi...
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[quote user="drdna"]Okay, today I hooked it up and have spend some time listening. The change in my system was very dramatic and positive. First of all, it seems suddenly like a good electricity day. The noise floor dropped out. The timbre of the mus...
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[quote user="Romy the Cat"] I have a feeling that if I have extra 6dB of gain and 4 times more power then I might be able to deal with new room. Sure, the only measurement in location would show. What I know is that I VERY much willing to preserve my...
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I kind of thinking about it and I am not sure that I have an opinion. In the former PP2000 I stunted buttery with over 100K capacitors, presuming that it will driver DCR of buttery lower and therefore improve the day-to-day decoupling of PP2000 from ...
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[quote user="peter foster"] By "dynamic viscosity" do you mean the reluctance of an amplifier to be dynamic, i.e., the degree to which an amplifier sounds like it is bogged down, usually as a result of a poor rise time on transients, i.e., poor HF re...
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I do not think Genn is close to an answer, he spent too much time to read the Lehnitsky’s brain-massage that made him to feel this way.
I am sure that there are some kinds of very pragmatic, predicable and manageable explanations for the effect that...
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@
montesquieu yes , the informations are from Silvio , this is the full text ??
Some
technical information regarding the different versions o...
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PFC is a function of adding Xc using capacitors to bring the current in the circuit downwards.What you have is an inductive load giving a lagging PF eg a simple motor gives a PF of 0.85.Thus the inductive element can be manipulated to bring it from l...
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Rectifier in linear audio systems draw high current at short time for charging psu capacitors.
I = Total peak current of an audio system at full load (current draw from wall AC)V = Voltage of main ACP = Total Power of Audio System = ...
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Hi Cat. I run the 12AX7s just a hair over 1mA each, and the 12AU7s at 6mA. With differential pairs and bleeders, it ends up at 39mA on each +/-300V rail. That works out to 7H minimum inductance at 60Hz, using the standard formula.&n...
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Not necessarily. Collect the large parts that you will be using (Power Transformers, Output Transformer, Plate Choke(s), Plate capacitors, etc.) put them all together on a table and try to visualize how you would like your amp to look like preserving...
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[quote user="PurePower"]Hi Max,If you have buzzing that is audible outside the PurePower case, or audible from a listening position, the behavior is not normal. The probable source is a capacitor. Caps can hum in the same way as transformers - the fo...
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The paper drivers, at least, look like the best of the vintage stuff. Of course it's hard to say without hands on how GIP products have translated from Vintage WE and, judging by the literature, either the "vintage market" is irresistable to them or...
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[quote user="Romy the Cat"] your diver might be a very good MF diver but it does not go to region where the “tizzing” live.[/quote]You may not believe me, but the driver start to roll off (very smoothly) after 14kHz and at 20kHz is at -6dB. I intent...
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Yes, there are a lot of paths.I can see that many DIYers are very much stick on crossovers, changing capacitors, choosing slopes in digital filters - FIR or not FiR and so on.I know very experienced people who now say that with digital crossover he d...
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I use to have IDAT-44 and IDAT-M (automobile version). I did not found them interesting, though they were not stock versions. Admittedly all Museatex stuff kind of “need work”, and even the stock Bidat was quite dead DAC.
It is still not know why t...
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I like to stress a point that the mammals that write thier doodles for audio publication are not juts ignorant fools but also the cheap, low class, falseificators. No wonder that the audio manufacturing companies do employ the so-called reviewers as ...
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There are many ways to deal with EAR-843PT. To my ears it works wonderfully, this in my case it coupled with Expressive Technologies ET2 transformer that probably takes in totally new league. I kind of so addicted to this transformer that I even run ...
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From another perspective it has film capacitors and the non-polarized Nichicon Muse caps. They take up-to to 30 days to burn-in. So, it might be just too fresh. I would not say that it kills everything – it is just a very-very slightly brighter, enou...
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Well, below is the email that I got from the man. I feel
that he is diagnosable. I am not the Doctor House but I have been insisting for
years that any person who spent proficiently in Audio Industry some time is fully
diagnosable.
On Thursday,...
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[quote user="Romy the Cat"]My attitude with my main TU-X1 is “do not harm” as I pretty much have no complains of frustration to it’s sound and I would be pity to loose what I have now from this tuner. I have some people told me about specific mods bu...
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I appreciated a couple of things, probably for different reasons than Q put them forward, I think. For one thing, I more or less discount his timelines, and also the idea that certain audio components reached a high-water mark as "complete" achievem...
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Wojtek, this is the whole astonishment of the story. There are no space flying technologies, no 30 years of research and investigation in a secretive lab which specialize on a submarine sonars, there's no capacitors made from unobtainium deelectr...
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Van den Hul released a new “interesting” phonostage: the Grail.
http://www.vandenhul.com/p_GA41.aspx
The apprentice of filtering caps certainly makes is very appearing but at this point it is not know the validity of the Van den H...
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Here are a few answers1. a, 84 Hz b, 4.8 inches square c, Hyperbolic exponential, T 0.8 1/2 Pi d, none so far on upper bass horn. S2 and 2405 have series capacitors feeding them. e, Eminence Kappa 12. 4. Both tweeter and S2 ca...
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