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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Many years gone now, I have tried to keep in mind the sound of live acoustic instruments and voices as I tuned my hi-fi system, as it and I have evolved. So far it seems that there are an infinite number of ways to "move closer" to a constantly...
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[quote user="Ostblock"]Is there any technical reason that you use a 400V transformer to feed the driver tube?The plate voltage on 6E5P is only +200V. Therefore from my point of view, a 220-240V transformer would be enough.[/quote]Ostblock, you need t...
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The transformer in this preamp was given from a friend who want to learn how to wind transformer. If I remember correctly it started out as UBT, they were bought (when UBT was operating in the Silicon Valley) at the company swap meet. They were rejec...
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Over the course of the enter 2006 Dima and I were involved into the Zarathustra II saga. It took countless phone calls, countless emails, a lot of thinking, numbers of shipments and many hours for Dima and me to propagate the project to it semi-compl...
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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="hagtech"] I didn't want to steal any of your ideas. [/quote] This is very bogus notion. If the 6E5P is somebody’s idea then would be not me but Dima’s as he discovered the tube “for Sound aplicatios” in 90s while he was fixing a TV. Howe...
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Joaco, thanks for sharing. We still do not know what make those units to sound to sound good, so in a way we are shooting in dark. I have no doubts that there is great number of commercial units out there, similar to APS PurePower, which might be su...
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[quote user="jessie.dazzle"]Yes, in a way you are correct; the wire is white but over time became sort of brown toward the socket; this is either from the metal contacts of the socket having oxidized in close proximity to the insulation, or simply fr...
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Yes, Jim, thanks. It is what I thought. I have some “pure” ringing at 440V line as well. After consulting with 5 creditable people I desided to discard the problem. Since the choke on it’s another side gives a perfect sinusoid with no spikes or disto...
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Hi Romy
6CJ3 (or equivalent) is the one you want. Though I've not used them myself, I have pals who regard them highly, FWIW. It has an average current rating of 350mA, but don't forget that for a given draw on the supply, the average current throug...
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Sorry Romy, i can't tell you about life longevity of 6E5P in my amp 'cause i'm not using them there anymore :)For my speakers two-stage SE sounded much nicer, more balanced and clear with more volume. Well at least it was easy to predict, considering...
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This is what I try to stick to: Try to create closed magnetic (steel) loops around magnetics. Ideally acompany itwith closed electric (copper) loops. This I think Pieter has done that already for you, but,as Romy impicite suggests, double boxing will...
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Well, without any theory or gut feeling to guide us, we are flailing around. So let me tell you what my instincts tell me and you can take it or leave it.I think the main advantage of the EM is reducing flux modulation. There was a post recently by o...
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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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The 100W+ SE is pretty much uncharted teritory, not to mention Bass SE. Who can speak about the Sound?Only that who tries.Paul, the diodes in Chimera are for biasing purpose, but I agree, here there is no cathode feedback not ot loose power,the whole...
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I wonder what the difference is between class A and B insulation is. Never noticed that parameter before. The 10 amp choke (I like their word reactor) must have some very large guage wire, as the resistance is really low. Clearly, b...
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[quote user="Dominic"]I'm liking lately the idea of getting a chinese 845 based SET off ebay. Point to point(less fiddly modification), there's a choke coupled one available now, umm, 10 or so watts for under a thousand dollars, you know that sort of...
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[quote user="Romy the Cat"]I kind of like that APS stay behind of their regenerator and that they are trying investigate what went wrong. Who knows, perhaps when the APS unit arrive back to me (after some changes in the unit state) it will be effecti...
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hmmm this post is going ahead faster than I could analize it or I am very late at reading it . Anyway I was doing some thinking about my needs . It turns thay for my 45 amp doesn´t make any major changes the time of day and electricity , but for my d...
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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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[quote user="shannon"]couldnt get "insert
iamge from gallary" to work so i attached it. Had it working for a couple weeks. Single stage 6e5p testbed. The
B+ rcore and output transformer is underneath. In the end r23 of 30k
worked with 30h chok...
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...in learning what is the reliability of the current production PurePower units. I'm considering investing in PP+1500 to power:
- A clone of Romy's phono (choke input filters)
- Headphone amp (180W...
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Robin, I'm not at all certain that my new speakers are "source tolerant", because I have "taken steps" all along to "ensure" part-to-part compatibility. I have tried to "sync" my phono and CD/DAC as much as possible, and the main thing I wanted from ...
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Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from being best for the 6C33C...
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Ok, it is a lot of information on my plate and I am trying to make sense of it. Below I will share my observations about the new Pure Power 3000+.
The first thing first. In the post I made a few days back:
http://www.GoodSoundClub.c...
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[quote user="haralanov"] According to a friend of mine, who has a lot of experience with GM70, this tube starts to sing only with (very high quality) interstage transformer coupling. He told me that when it is used with coupling capacitor (as is the ...
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I was digging in my archives, trying to find what exactly input cap I've put and how. Didn't find that. IIRC I've put two, in V configuration, one output of the HV bridge to mass, another exit of the HT choke to mass. Found some traces of voltag...
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i had browser issues again so some of the eloquence of my intended post will likely be lost.
anyhoo.
Maybe it's just me, but i'm almost never content with replacing what i've got with something equivalent. This would be as regards Greg's last p...
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Roman,[quote user="Romy the Cat"]May I ask you, this realization of yours… dose it has any “sound”. [/quote]The one we have build which is a little different (6S45 not C3g, also tried WE 417A, 437A, TX-101 Copper not silver, AN UK Line Output Transfo...
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Hi,[quote user="Romy the Cat"]
I lately have some reasons to think about optimum requirements for SET’s out transformer if the amp handles juts a narrows bandwidth. For instance let pretend that we have 2 monoblock and each of them drive: LF <10...
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