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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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After years of using the Expressive Technologies SU-1 and SU-2 step up transformers I come across to a fact this morning that the Expressive was reviewed by Robert Harley in June, 1992. I read the Expressive’s preamp review but I never seen this one....
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I spent today a couple hours trying to resolve a quantity with my analog setup. As you remember in the mid of this thread:
http://www.goodsoundclub.com/TreeItem.aspx?postID=2015#2015
I was proud that I eventually found a good configuration for my M...
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[quote user="de charlus"]Alas, I am too young to have that whole "Mirrorphonics nostalgia" coloring my taste in sound reproduction - still, this is not to say that it cannot be investigated. [/quote] Actually the "Mirrorphonics nostalgia" that some p...
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My project to add 3 one-stages channels to Super Melquiades look like progressing (it means I will have the new 15,5:1output transformers very soon) and in context of upcoming changes and, after long consideration and some tests, I desire...
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[quote user="RonyWeissman"]Hi romy, thanks for info. I am going to stick with the 2-stage plan then as it will not be DSET but full range and my mid-bass is somewhat barbaric at this point. I have found someone to build for me, though we ha...
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Interesting that a notion of an Absolutely Transparent Stage is kind of bizarre. Let presume that we do have an Absolutely Transparent, musically and sonically, stage. The stage might be transparent only with own enclosed scope. If a stage modifies t...
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I was yesterday drawing plans for the Zaratustra II’s chassis and was wondering how I might use it. The Zaratustra II turned out to be a little Monster, efforts-wise and expanses-wise. I hope it will demonstrate some results that will rectify the eff...
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I am now involved in incredibly interesting project (tell you later about it what have firm result) where I need to use a between stages a cap that cares 1V and practically no current. The best film caps that I tried were 100V-400V and they actually ...
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"Indeed for classical work I often find a slightly under damped bass response to be emotionally evocative and of benefit to the illusion of the acoustic"Have you looked at the primary cause of this issue with most SET amps? I can tell you that ...
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N-set, a friend of mine built an amp with this monstrous USSR tube. It has 3 stages and the GU81M is driven by 6C33C.Within context of driving mid or high sensitivity bass drivers, this is all you need. In comparison, his previous SET with 6C33C soun...
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Skushino, from what you say I presume you use two pair of ML2, right? Yes, what you say is correct but if I were you then I would not introduce an addition caps to signal path. In my view the best scenario for high path would be to minimize the coupl...
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What is the "reverse engineering" version of an SET circuit that would accomplish - in terms of audible results - what you want? The reason I suggest 3 stages is only because I see a gap between required input and necessary output for the proposed d...
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[quote user="Paul S"]What is the "reverse engineering" version of an SET circuit that would accomplish - in terms of audible results - what you want? The reason I suggest 3 stages is only because I see a gap between required input and necessary outp...
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N-set,actually, as you drew it, it became not too complex amp. What I would like to find is some kind tube like 833 only twin triode. Then it would be possible to have one chassis with a single drive and two output power stages. With 100W on fil...
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Maybe the best way to think about the X/O is that one way or another, it's effectively part of the amplification chain.Don't the "2 stages" in the Marchand include offset for X/O losses? Sure, if the X/O is interstage, then it will need to clean up ...
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N-set, have another look at the Chimera "bias", and the sophistocated way the diodes effectively buffer the gain stages, also the way the caps are staged over the tiered ground planes. Also check where the Ls are with respect to the signal. Perhaps...
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Just the symptoms caused by the bad electricity, tons of tubes and other parts in various stages of decline, pins/sockets/connections, along with analog and digital source issues is the stuff of madness. I am so happy when everything works...
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Not exacty a direct response, but I have wondered for a while now if having good electricity as a starting point means one could benefit from simpler power supplies. I mean, how many LCs does one need , given perfect, quiet AC to begi...
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The first goal is the best sound possible, taking every advantage to get it. Since the [crappy] [wall] power source is such a big factor in the sound we get from hi-fi, I could see designing line-level stages for use with batteries as a possible...
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[quote user="cv"]Hi Romy, I dunno if you mean the C-core materials itself or the completed transformers... if the former (perhaps a poor term in this context), then http://www.elnamagnetics.com have what you are looking for. Seach for AMCC - these ar...
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[quote user="Paul S"] Which caps exactly did you decide to try? I don't recognize the big black jobbies. Are they oilers? Are they 200V? [/quote]
I did not “decide” but went with what I had in my hands. They are the Ansars from the...
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[quote user="Romy the Cat"] There were some educational for myself observations made, in some way saying something about this specific DHT, in some way saying something about Melquiades’ single stage version and the Melquiades’ full-range two-stages ...
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I'm sure there are many bad implementations of the 845 and 211. Almost all of the commercially available ones are pretty mediocre. However I have heard good examples of both so I know it can be done. I've yet to hear an impressive 6C33 amp so it...
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[quote user="ml8"]So sometimes i just wonder why do you need 6C33C at all, with your high-sensitive speakers.[/quote]Actually it would be VERY interesting to expend on it sometimes… Why the Supper Melquiades could not be juts one powerful 2-stafes LF...
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You are in a position now that I have never been in: with plenty of "FR" gain, able to home in on exactly the "wide band" sound you want, with no real need at all for FR.Who could resist trying the old 45 or 50 in this situation? Lose (or loosen up)...
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Yes, the people in the beginning of the thread were right – the DHT two stage solutions do sound more interesting than one stage amp. Still, it does not suggest that if I have 12dB more gain on my single-stage triode I would not be able to load m...
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HP means high-passing, right? In Melquiades I do it by changing the coupling cap between the stages. You can do the same in ML2. To unsolder the cap from ML2 is pain in ass but you might juts clip one of the lead and solder another smaller cap next t...
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Paul, electrical engineering has as much to do with Sound as pimples on my ass with craters on the moon :D ! I think I understand our confusiona: you've probably seen some earlier circuit perhaps with one big 700V or 800V choke-input supply and then ...
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To keep with Romy's spirit of sharing his work, I have attached a file of VER 1.0 of the DSET Power Supply. There are quite a few differences to Romy's published schematics but it is basically the same beast. You will notice a lot of power transfor...
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Yes, decoud, the 6e5p-GM70 is an easy amp but 6e5p is a hell of voltage driver and I do not feel that a single 6e5p will be able to drive GM70 into grid currents. If people use dead speakers and need a lot of power than use the ability of direct hea...
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