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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Paul, below is the Axiom. I must say I've never heard it nor know anything about the objectives behind the amp. I've just found the topology very elegant and appealing. As far as I understand, the diodesare used for biasing rather than resistors beca...
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Wow, you sure do pack it in there! I like the way you silicone the caps and other things into place. Maybe you can do the same for the bleeder resistors and wiring bundles? That is, once you are sure it is operational. Wires c...
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We know that speaker surrounds are subject to memory effects. Is not playing the speaker (keeping the voice coils warm and surrounds elastic) not the big part of having to warm up the system?With power supplies containing modern diodes, caps and resi...
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The grounding I have employed is a mixture of a "local star" and GND plane (I've obviously copied it from the Cat).I did pay a lot of attention not to have loops. Here is my grounding scheme. I wonder if there are any obvious errors?There is a switch...
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[quote user="Romy the Cat"]I think that you did not exactly my version but made some modifications; I do not know/remember what they were. [/quote]CCS heating of the tubes based on LT337A, 2x0.47u+470K at the output,my filtering is a bit bulkier at ...
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A slightly lower filament voltage is okay for a coated filament (not for a Thoriated-Tungsten filament however). There was some testing done some time ago on this and findings indicated an increase in tube life and lowered distortion. I just don't re...
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I'm way too lazy to double check the math, but it looks on the face of it like the 6N6P is one answer to the numerical problems you've posed so far.As for sound, I would prefer the best 6SN7s. But who can find them and who can afford them, once they...
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Not sure where you live, but near large cities one can rent "pro" sound equipment. Once you have your end game figured out in terms of architecture you can just plug in the Board, find and note your X/O configurations and values, then make up and in...
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I think industrial grade Arcotronics KP172 (from RS components ?), film and foil. I use them also as output coupling caps (2x0,47u)
Other changes I've made, not commented in my posts here:
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is what I have called it, and what I hear you are describing? I wonder for how long you will be OK with it. We have had this effect by using 1st order crossover with absolute minimal insertion loss, so you would now listing to uncorrected drivers in ...
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Likely, whatever you do with subs will include a big coil, and caps and resistors, too, if to make a steep filter to "match" the Dannoy LF "roll off". The sub(s) might be tailored in terms of correct SPL to blend with the Dannoy at the X/O point, and...
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And there is no substitute for listening to it, no matter how careful the "calculations". Anyway, I don't have it "figured out", that's for sure. Some guys figure in and use the inductor DCR in lieu of resistors (apropos), which seems clev...
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Anthony, congratulations on getting your project to this point! I mention without referring back to your schematics, I think you will be glad to have test points, along with variable resistors (trim pots) to re-set operating points, as needed, if on...
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OK, I read the blurb. Now that the cat's out of the bag, and we know it's just a resistor ladder, why not use... a resistor ladder? Gotta hand it to those "MIT" guys, also I think there's room yet for upgrades. How about a deluxe, super-limited, l...
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This is quite recent conclusion, as I sick and tired to do not say it finally!
A loudspeaker must have a volume control that will adjust an amount of HF that a loudspeaker radiates into listening space. I playback systems that has an excessive 1/3 d...
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This thread is split from the following thread:
http://www.goodsoundclub.com/LatestPosts.aspx?ThreadID=2665
Jessie, I hope you do not mind that I pulled it to the forum explicitly dedicated to the Melquiades Support.
5-channels Melquiades is ...
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Hi Romy,I wish I had seen your post on Placette before buying mine. I didn't realize that there is no balance control on the unit. I know in theory this should not be a problem, but I miss this feature for several reasons. Can't hav...
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They chase numbers because numbers is the only thing you can unambiguously compare. The model for evaluating feedback equipment ought to be musical instruments: that it is not perhaps tells us that most of the time audio equipment is not used to repr...
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I have coved this subject in past. I was not able to find a solution how to add resistors to change loading and how to make it to be switched that would not degrade sound. So, my own phonocorrector has no adjustable loading. If I need to do it I woul...
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I have to say, I never gave it much thought, since, as you say, The Book says 5751s are an OK sub for 12AX7. I did realize that the gain was lower, but I obviously had a brain cramp in not interpolating the lower gain to "redistributed" global ...
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My new 20L and 30K L-pads for the 6-chenals Super Melquiades’ tweeters and Injection channels. They are 24dB down by 1dB, made on the Elma Rotary switches and stuffed with unavoidable RB60 resistors. I did not want to burn my fingers and outsourced t...
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One supposes good sound, but... come on, they can't be THAT good (can they?)...http://www.partsconnexion.com/catalog/CapacitorsFilm.html Deulund tabs on the bottom of the pageThey also say Jensen on them, meaning, I ass-u-me, that J...
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[quote user="Romy the Cat"]The wire, the coupling caps, the cathode resistors and many other things are superbly important but it is after the strategic topology is settled. In my view caps, resistor, wire and other things are responsible for the sou...
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I like having a center-tapped filament winding for flexibility. First, you can use a traditional approach on hum balance (what you have now) or use a slightly different approach. I use the center-tap as a fixed DC balance (cathode bias resistor solo...
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Roman,> Any IC-base RIAA corrector should cost $30, with no expiations.Now now.... My "Analogue Addicts Phono Stage" is Op-Amp based and requires at current OEM bugetary pricing in 1000pc lots of $12.25 each. Add Tinfoil & Polystyrene Capacito...
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Do you use input 50KOhm Z-foil resistor between input tube greed and GND?Does Z-foil sound colder compared to Dale RN60D?U used Dale before. Now I use Shinkoh tantalum resistor. It has similar to Dale tonal balance but sounds smoother.I heard a lot o...
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Hello, would it be possible for us to see the diagrams and schematics behind the Zarathustra II in the same spirit as the Melquiades was conceived, noting that the best of ideas are formed with the purest of sentiments?[quote]It is Dima’s and my stro...
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Romy, I was asking questions here, and @ RMAF because I'm trying to gather enough information to build compression drivers. At my day job I am a prototype machinist at Los Alamos National Lab. I don't plan on going into production, j...
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Yes, you are right, the voltage divider from 6.3V across 47K and 10K resistors shall give not 0.9V but 1.1V. However, the numbers that are in circuit are not something that I saw in my dreams but the actual numbers that I measured. I might presume th...
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[quote user="Romy the Cat"]Anyow, it is not difficult to find out if your copy works +/- properly. If you have right plate voltage and the tube has the expected gain then the stage works fine. I do not remember now but I believe in closed loop the c...
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