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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"]Romy, when you mention "dynamic sinking" of ribbons are you speaking of sub-8k Hz use of powerful ribbons like the Water Drop compared to 109 dB efficient compression drivers, or do you notice this dynamic sinking no matter ...
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The past 6 - 8 months I have been living with very efficient speakers (~ 109dB/m/w) driven by low-power SET amps. The amps use 300B output tubes for about 7 wpc. On paper, this should be a match made in heaven. In fact, the combination is capable of ...
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Paul: You are completely wrong. While they may not have tested every unit in the past, they do now. They even send graphs of the testing results with the unit. I spoke with their engineer before sending one of my units back for a problem that turned ...
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I agree i have been making mistakes even costly ones. I had taken the biamping route with cary and krell on B&W , and that was the purpose of getting both the amps, to get the best out of both ,,,,,,it turned out mixing oil and water,,,,,the most...
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The PurePower 2000 claimed efficiency is in fact equal to or greater than 85%. Our 89% rating was published before we added the 2000 model so I will correct it immediately. The energy losses from efficiency are mostly expended in heat - and so cannot...
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I can’t stress now much I am fallen in love with my new PP2000. I was playing it today all day and can’t not see any single thing that I would bitch. I perhaps is missing too much the sound of proper electricity but my feeling is that the new uni...
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I did not make my mind about it but I have some “concerns”. Using SS amps and hearing different SS amps I do not like their bass and the notion of a powerful enough DSET to be able to drive ULF in A1 was born. Sounds logical. However, recently I ...
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Fuses are seldom used in modern installations, but they are still widely available. "Better" breakers are also available from commercial suppliers, for whatever they're worth. It is true that "regular" breakers "soften" over time, and also in hot wea...
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[quote user="Romy the Cat"]That is a whole point: the shape of the sinusoid and consequential harmonic distortions are not being the decisive factor that responsible for better sound. It is sad that neither PP owners nor we the users after years of u...
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I waited for years to get my PP3000, but they DID finally come through and deliver the product. It was worth the wait in terms of the sound quality improvement. they are a very tiny company, it seems with limited cash flow. This is typical of the hig...
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Well, I would just say that it is clear that the company cannot keep up with the demand. They prioritize certain orders to fulfill that will be most important to increase their business, in their opinion, such as reviewers and retailers. It's underst...
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Rowuk,I think that is a good thought. I think power supplies are an afterthought to most audio designers or they think about it in simplistic terms such as bigger is better. I hate to confess this in a public forum but I have found better sonics resu...
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I have connected My Audio Note DAC 5 to EAR HP4 Headphone Amplifier and I hear the sound from My Sennheiser HD800. the Source is Computer .
Sennheiser HD800 is not easy load for HP4 and i think HD800 is very very bad sounding Headphone.
...
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Jarek, When you say "not 50 Hz hum" it reminds me very much of my troubles I had with my Pure Power 1500 -- (before it "blew up" and needed to be repaired ... ultimately replaced with a new PP 2000 plus by Damien) -- but in any regard, the hum was ca...
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In regard to the noise issue I had with my Pure Power unit in the past, I never noticed it with my tuner or other components, but I mostly listen to the phonograph. In particular the Decca cartridges are incredible as antennas and seem to pick up all...
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[quote user="rowuk"]Do we simply not want a non-changing target? As regeneration does not seem to be „the“ solution (especially if the AC cord behind the regenerator changes bass), what does better AC even mean?Perhaps the designers of great equipmen...
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[quote user="N-set"]
They have figured out a way to
eliminate this but it requires making a new PCB to replace one in the
PP2000. So they say they are going to make these and hopefully the
replacement PCB will be given to me in a month." [/quo...
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It seems the pure power 3000 diagram is like below :The battery voltage in new pure power+3000 is 72v (6x12v in 230v version) and the battery voltage convert to 330v by a switching dc to dc converter if i am not mistaken.What is your idea if we remov...
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Romy , you are right , pure power affects on wall AC quality, when a pp3000 is connected to wall ac (the TV not connected to PP3000) then the picture quality of my TV decrease. allways I use only one pure power 3000 and other pure powers are disconne...
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Amir,Taking note that the DC condition is present when you say the power is cleanest yet Pure Power does not help leads one to want to investigate a high current DC blocker BEFORE the PP. Its possible that heavy DC could effect the PP in some way. Mo...
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[quote user="cv"]You may wish to apply similar tactics to the power supply (low DCR inductors) if you want to be really surprised...[/quote]What do you mean, Chris?
I usually use my input chokes 4-5 times of critical inductance and twice of rated cu...
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Hi Romy,Thanks for your response! I have never tried grounding the cathode in any of my tube projects. Even my amp output stages have been mostly cathode biased. But I am going to try grounded cathodes (and the +/- input stage supply) in my next amp,...
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I saw Kojo Technology is looking for an engineer relating to audio power regeneration:http://kojo-seiko.co.jp/recruit.htmlRun the posting through google translate if you are interest in job and don't understand Japanese. I own some Kojo stuff but don...
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Power cords is the
most ridicules subject that I have seen in audio and they define all rules,
would it be stupid rules or sensible rules. There is absolutely no difference
in power cords construction, built quality, price, material use, insolatio...
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Devo, the GM-100 for sure is a good triode to get 160 watts
output power in A1. Still, it would be a good chose, from my point of view,
ONLY from a prospect of embracing as good DIY audio project. There is nothing wrong
then to do the good DIY aud...
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I am very much do not like the current state of my mind about the single-stage Milq. Let me to explain….
In 2001-2002 I spend some time trying to assess the sonic influence of PS to sound. After making numerous tests and prototypes I concluded that ...
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Since adding the one-staging 3 channels have triggered the replacement of all magnetiks in the Super Milq’s power supplies:
http://www.GoodSoundClub.com/TreeItem.aspx?PostID=3694
http://www.GoodSoundClub.com/TreeItem.aspx?PostID=4708
I was...
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Romy, of course I do not know if what you are describing is anything like what I hear from SETs, but that was my first thought when I read the post, the way it is so soothing - up to a point.I do not understand the relationship between the tube, the ...
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[quote user="hagtech"] It's difficult for me to guess exactly what the possible sonic effects of the ripples would be. I see a tube operating at a fixed point, having a particular distortion spectrum. Say -42dB 2nd harmonic. Then, t...
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I was playing with new power supply over this weekend, trying to optimize everything. First I got rid of bleeders at all B+ - it has enough critical current with them according to my measurements after the bride. All supplies after the first ...
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