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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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This trick of disconnecting all the grounds works, depending. . . I am not a happy or unhappy, as the case may be, PP owner, but I know this to be the case anyway.Now, is everyone aware that which way the plug is mounted in the socket make a differen...
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Paul, I know NOTHING about pentodes. I looked at the curves:at 1500V/300mA/-85V loaded with 3.2k will give a whooping 190Wwith +/-85Vmax swing, staying in A1. At 2.4k this drops to 155W.G2 @500V, eating 50mA of current(!)But the linearity...???? The ...
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[quote user="N-set"]This is unfortunately +/- what I'd expect from torsion field followers.Akimov and Shipov are two Russian "academics" behind the very concept.[/quote]Excuse me, can I dumb. I ask: What does Mr. Akimov IMET to audio? Or Mr. Thorns? ...
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[quote user="Romy the Cat"]It is unquestionably an ambiguous project. The topmost question that I would ask myself after this project would be the following: can Milq-biased 6E5P to be as good (sound-wise) DC driver as some vintage direct heated tube...
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I kept thinking about cats and cat food (also known as birds) listening habits this afternoon. That's why parrots bob up and down, as well as (less often) twist back and forth on one leg sometimes-- to triangulate and pinpoint a location in all...
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Yes, in case of tube DC coupling line stabilization is desirable but it would serve only practical aspect of locking the operation point of output tube. The way HOW the line was stabilized very much might affect negatively the way how the whole ampli...
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Mani, congratulations with Pacific.
You will not have problems to drive with balanced Pacific your single-ended amp. Juts buy a good quality XLR to RCA adapter or order XLR to RCA cable and you will be set. You do not even need to care about t...
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Yes, the idea of dentist chair with almost a fixation of the head is certainly there but it needs to be done NATURALLY and not abusive. I do like the idea of the Rover chair, perhaps not chair itself but a very strong metal frame. I feel that arm res...
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Romy, I have not gone back to look at all the pictures you've posted, but more annotated roof/ceiling pictures from the outside/inside, and maybe a couple of attic shots, would be helpful. Did you mention if you presently have typically-webbed trusse...
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Paul, 100% agreed on the real world test vs all other mental exercises!!!Not sure on what do you mean by the "follower"?Yes, I need only 2 stages, perhaps TVC at the input. I'll even have a bit too much gain, if I'm correct.Romy style bias on 6E5P an...
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Paul, don't get me wrong--normally I'm not choosing a tube by the power, but this situation is somehow special.There are very few tubes which have the right electrical parameters (gm, mu, power, etc) to start with. In thesmall tubes word one can glaz...
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Well, they did not meet your specification, that is simple as that and they shall be taking care of all international shipping cost , import tax , VAT. I am a bit surprised as if it is more or less serious company then they shall not be able to miss ...
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I have huge AMCC800A cores for two such transformersand good winders with HV experience. I also have a lot ofquiality coax cable, good to few kV for the chassis hook-up.Again, if somebody is willing to take care of that, I can lend.I'm myself 3000km ...
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I've made an itellectuall excercise and tried to see hoe to fullfil (some of) Romy'spoints regarding the bass amp.1) To get 100+ W from 833, HT between 2.5kV and 3kV will not work.Spending some time over the curves, 1400V, 0V, 280mA loaded with6.5k s...
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Rick, sure, working volltage is important. What does your inverter require in the way of current in order to produce it's rated voltage at its rated current? I can remember times when I measured "correct" voltage when the battery was functionally use...
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Ok, I said a mistake, I like direct radiator (sealed speakers) too, but I often noticed more dynamic with horn speakers (I like every speakers (if properly tunned) except speakers that radiate with both sight of the drivers (bass-reflex, tapped horn,...
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First, Adrian, Thanks for your feedback on the newer designed 2A3 tubes... very interesting. I've looked at all 3 of these brands before but have not as of yet purchased any (I have a large collection of 45 and 2A3 of various NOS US brands...
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N-set, starting from reasonable input, the 6E5P can swing some serious voltage, and Romy also sings its praises in terms of sound. Maybe sim that, running it in its safe zone to a 6C33C. From there, you have all the power you'd want to drive -- what...
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[quote user="Paul S"]Don't worry about selling stuff you "don't like". To another Moron® it might be the Legendary Stuff of Dreams. Be honest about what it is; simply hold your current opinion.[/quote]I've just sold my Druids (took a £500 hit on wh...
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[quote user="floobydust"] Some very good points here... if I downloaded the correct schematic from your site for the 6-channel Melq amp (also has the term DSET in the title) then you have created a 6-channel SET amp with built-in crossover points. Yo...
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OK, I have one foot back in the water again, a hand-me-down monoblock from a "well-respected movie sound producer", to whom I am connected through dear friends. Like most "sound professionals", he is fairly dismissive of the way "we" hi-fi nerds go ...
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[quote user="Paul S"]He did note that the ML2.2 uses a different OPT, and also that it uses "less feedback" than the ML2.1 … I wonder what this means, "less feedback"? Why would Lamm mess with that very effective scheme? Does he just shunt some vo...
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I chose the 170V point as midway between the 250V supply I had for the CCS plate load. The choice was for maximal signal swing in both directions. [quote]in a properly designed amplifier a transformer should clip before the active stages[...
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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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It seems ironic that the path to bringing the single-channel DSET/narrow band horn idea to market would invlove traditional marketing per se as much as the melding of evolved listening with cutting edge technology. While there is rote work...
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Unfortunately I've reached out but not managed to make contact with John Hasquin regarding the spacer in the upperbass horn. I'll just have to wing it.I did finally manage to get a day and a half to make the second DSET operational but it refuses to...
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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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[quote user="Romy the Cat"] anthony wrote:I am not sure how large to make the filter caps for
the DHT channel. At this stage I think I will start at 3000uF and perhaps
try altering it a little up or down once the system is stable. Hm, it is depend...
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[quote user="floobydust"] The main component that limits low-frequency response in any SET is the OPT. For these initial designs, I used the smallest Hashimoto SE OPTs... their H-203S for the 2A3 and their H-507S for the 45 which are rated at 7...
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Hi Romy,Agreed about the S2 transformer being the most prominent it is here I think that mumetal will shine. I should have said that I was referring to the upper S2 covering 1k-12k or so. I wasn't too clear earlier - when I suggested rolling of...
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