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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I do not nave, neither I see in the schematic, a resistor
but rather an Lpad shunted with two resistors, exactly how I described above....
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The usual "trick" to "stop inductance" of wire wound resistors is the "old double-wound trick", like those offered by Mills:
http://www.soniccraft.com/index.php/resistors-mills-c-29_53
(and I think it is much the same for capacitors, for that mat...
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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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If you have nothing more than low hiss, as you describe, then you are probably about There. In my experience, at any rate, it's either some hiss or some hum, compared to true silence, like the ML2, etc.Do not give up before you try all parts hard wi...
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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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[quote user="Paul S"]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 poi...
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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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Romy,My DSET amps are still open (no top plate) so are fully ventilated, but I have left vents in the top plate around all of the valves and installed two computer fans (running very low speed) that push air from the bottom and out the vents on the t...
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[quote user="Iraschwips"]I don’t have any way of testing but the speaker is supposed to present a relatively flat 10ohm load. [/quote]This is an excellent tool for measuring the impedance load of your loudspeaker. I have one and use it all the time....
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BR, I have never used Romy's amp design, but I have used 6C33C SETs with Lowthers. I do not use my Lowthers FR, for reasons that are fully explicated throughout this site, so I don't worry about LF from those drivers. IMO, their best is MF up to tr...
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I Forgot they did this. I only have experience with se driver stage. You would remove r3 and c1. change r2 to 10k and put the bias voltage from the gas tubes across it. I would try just regualar zaruthstra srpp circuit first. Like do you know it wi...
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Hi Skushino,1) In your post above regarding certain(?) of Bruce's products, can you please identify *what* crossover parts you received or heard (in context of given system) which you feel are "low quality" ..?2) Which model & ...
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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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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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Hello to all, After following the comments of Romy for some time (have learned a lot, thank you), I would like to ask a question on this subject.This circuit is built with resistors, diodes and capacitors. Could someone elaborate how it can produce a...
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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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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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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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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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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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[quote user="Romy the Cat"]That is a good question and I asked myself it numerous times. My current standing is the benefits are purely intellectual as I am not able to observe the applied benefits. [/quote] Recently I got eventually the box (th...
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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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The new Super Milq’s input with combined filer and bias resistors.
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Romy, I am not clear why you would worry about DC if you can set the RC where you want it and mute input.Biggest problem, of course, is HF, since it takes bugger all to blow those ribbons. But I thought you had that variac that the Serb gave yo...
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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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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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Options are limited here... looking at the schematic, you're sorta pinned in by the biasing topology used. One typical method would be to use a resistor divider network at the input grid to the 6E6P. Problem is, this results in a huge bias offset. By...
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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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