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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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... it may well work superbly. Where it may not be ideal - well, let me explain. The Miller capacitance is not constant but will have some dependence on level (this effect is much more pronounced in silicon). If we feed the valve from a small capacit...
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[quote user="NBC"]Can you please clarify what you mean by "active biasing" -- in relation to the caps? [/quote]
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Lawrence,
Here is the Webster Online Dictionary (http://www.merriam-webster.com/dictionary/moron) definition of the word Moron:Definition of MORON1usually offensive : a person affected with mild mental retardation2: a very stupid personIn this thre...
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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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[quote user="Romy the Cat"]The real wet dream of mine, something that I would like to have but never went for is to have in the axis of the air caps a high precision step motor and a remote control that would allow me to modify the phono equalization...
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My class A/B SS amps happen to idle at 500W, and the A-to-B crossover point may vary from one A/B amp to another. But what Bill says remains true for many (if not most) [SS] audio electrical components. Some manufacturers recommend leaving the compon...
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Hi Guy, I know what you mean; this phono stage really should not work well at all. I mean, voltage doubler, 3 stages of 12ax7, feedback, cathode followers, garbage looking power supply shared tubes for stereo...mortifying isn't it! These ...
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Quotes from Romy in blue: "...Anyhow, I do not know at which stage your project is what I think you are somewhere in a process of integrating the drivers..."I would like to stabilize the system, and listen to the existing horns, while ...
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Yes, 10 uF is rather large for a coupler, alright, but not unheard of. Conversely, .47uF would be on the small side for a "powerful" amp using the 6C33C out (4.7 uF might be more like it...). My own phono stage uses 5 uF film couplers. One would supp...
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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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"I do not know where we go from here. I have some clear ideas and some very specific experiments that need to be done with PP2000 but I would like the test were endorsed and underwritten by PurePower""I have a number of very serious engineers on my e...
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I did put the coupling air cap into the game. It works fine but I have now some reservations as well. I need to listen it for some time to find out what it going on.
Added in 3 hours:I gave to the air cap some listening attention and frankly speaki...
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Allo I tell you what it is that's putting everybody off, it's that bloody input stage biasing arrangement... The other thing is that people who know enough to build it have probably read a bunch of stuff here and there, and therefore been anointed in...
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I kind of disagree with Adrian. 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 th...
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Romy,do not spit in my eyes as I do have solid state PassLabs 350.5 but even with this 50W Class A amp (push pull) it is exactly the same problem if it is switched off completely even for a short while. I can take ~ 2 - 3 days to be back to norma...
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N-set, I am tired right now but I think part of the "idea" is that all the parts will be perfect, with extremely low distortion into radar range, including specially chosen diodes, not to mention the big caps and wide-swinging Ls. And where will the...
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It is done with own vision and very consistant with own vision. However, I’m not position to assess how it might sound. This guy drives Lowthers and believes that he is a belly-button of universe. I do not case about nether 300B sound not Lowthers so...
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One ironic thing about the ML2s is the contrast between the fantastic workmanship and the mostly average parts. Of course, the sockets are plain crappy, and I suffered plenty with them until I started using the dielectric grease. I have been too ...
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How nice would it be if you did not have to re-cut and re-seal the "some kind of sealer" for every adjustment? If the mating surfaces had "pipe grade" interiors and exteriors, you might be able to use silicone-slicked o-rings or similar gaskets f...
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N-set, I am sure you realize by now that I do not properly understand "electronics". I see the "diodes" in the Chimera circuit as a sort of "active" bias that is also dynamic proof against blowback/ripple to and from the tank, at each of three "...
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I tried a highly modded DEQX on my horns for some time, we did all the time alignment with it, we used 1st order and 4th order xovers and everything in between, we used LeCleach adjustment for bass and all the other drivers we had it sounding for som...
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Thanks, Romy.Although I am most certainly not a DIY/electronics whiz, and have no aim to be, I can +/- read a schematic and I can solder OK, have a de-soldering gun, etc.Yes, there's no question that these sockets are poor quality...
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[quote user="deemon"]Brian , I never tried SSG cap in phonostage . SSG has a good reputation ..... but I'd prefer teflon for coupling . Mica caps , even good ones like SSG , seems too "bright" for me , but teflon sound pretty neut...
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The "lack" of HF is definitely one of the wonderful things that makes one think of spending 30K on a phono stage. Glad to hear you are "suffering" a similar "dirth" of HF [noise] with your DIY corrector.I wasn't going to say anything, but I won...
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I ripped my Cd player (to old to mention ) output stage and replaced it with SS J-fet phono preamp .I took RIaa components out .The dac puts out only 20mV so the MM stage with separate PSU and discrete J-fet regulators seems adequte for the job. Whol...
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Metrum acoustics mini dac octave as an alternative to NOS dac from 47 labs. The same concept in modern application. I had a chance to listen to this dac as compared to 47 labs cloned dac (the clone was unfortunately filled with those expensive b...
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At this stage I am looking at running the two 440V supplies from separate secondaries of the same transformer and likewise for the two 240V supplies. The guy that is making the transformers thinks this will be the most effective way for my particula...
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decoud , have you managed to find the Electrocube 950 2uF ? I ask because ,I have been trying for the last few months to find a pair,but with no luck.Nothing on EBay ,most retailers do not carry them or shipp internationally .So if you or anybody els...
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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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Great! Please let me know when you are ready to unveil it. In the meantime, is there something I could start working on? Can you pass me transformer parameters? What about tubes and sockets? Caps?
Thank you....
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