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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="PurePower"]Hi Max,If you have buzzing that is audible outside the PurePower case, or audible from a listening position, the behavior is not normal. The probable source is a capacitor. Caps can hum in the same way as transformers - the fo...
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[quote user="hoan da ox"]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 elabo...
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Here is a semi-final draft of 6-chennals Melquiades Power Supply. Since I use my site pretty much as a notebook would like to have the diagraph posted in this thread for my personal references.
http://www.RomyTheCat.com/PDF/6way_Melquiades_PS.pdf
A...
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[quote user="clarkjohnsen"] The sales guy was insisted about the super-isolation quality of adeptResponse but it is all BS, he did not understand what he was talking about. You are arguing that the unit can't be much good because the sales guy was ta...
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[quote user="Romy the Cat"] I do some very interesting experiments with Rohde & Schwarz tuner. Dima and I have discovered a way to use the Schwarz without the wide bandwidth amplifier, driving the Multiplex Decoder from the Schwarz’s preamps. Bas...
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It is true that a given battery will have "special" requirements for optimal charging. Also, where the battery is in a circuit and the specific demands of use can influence how and/or how quickly it "wants to be charged", not to mention different ba...
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Romy,I used second tube grid resistor, 1.8Meg Holco. (I couldn't find 2 Meg chip and good quality resistor: Dell RN60D or Holco or even Caddock MK-132.)But I felt the deep bus was cut. I tried 1.8Meg Holco & Riken 220K in serial. The deep bus inc...
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yep-- i always measure first to get as close as i can get to a matched set (within a % or 2 at least!). luckily, for this application, i got 4 extras.. so i should be able to get close, and for all the sub- 1uF caps i have around for all the ot...
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scooter,
actually this is something what I am planning to do: to have a few selected items that I will moive myself in my car and then let the rest to be move in by movers. The place is not far from Back Bay. It is West Woburn, right equidista...
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To my ears silver has a potential advantage over copper that unfortunately seems difficult to achieve. I've read that the advantage may come from the lower DC conductivity, and the problems from higher inductivity and skin effect, and lower internal ...
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I am getting a dedicated third amp to drive my upper bass channel and I just figured out that when I go with my midrange channel at the line level passive filter then I would need 0.0000302uF capacitor against the amp's input stage, that means… 30pF…...
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[quote user="Antonio J."] - Regarding C2 the 2000uF/450v cap, he suggests to replace it with 5 x 200uF/200V by Mundorf (he can get them for a good price, probably better those five caps than a single 2000/450). I'm not sure about this replacement, it...
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[quote user="Paul S"]how many LCs does one need , given perfect, quiet AC to begin with?[/quote]Probably correct, considering the physical vibrations etc. that large capacitors can create. There may be the potential for added distortions. However, ...
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Yes, referring to my initial post on the thread: something in the Super Melquiades is very freaky. I did not use it for a week and this morning I tuned it on. The amp generally does not sound good for a first 10 minutes and reaches it’s stable ...
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Well, the subject of capacitors in that PS should be resolved. We discussed it a lot with Dima and he feel that I am fool all my idea to try in this supply “minimum capacitance”. He actually does not believe in small capacitance, he has a vision how ...
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A clue!You are not using the ground on the PP3000 unit and have ferrite packages on the incoming mains supply.I am guessing that you have fitted a clamp directly around the power cord.If this is the case, then you are using the ferrite on the ground ...
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Are we all in agreement that up to now "the best power" in terms of sound has been the best wall power?Maybe this has something to do with the fact that on a good day there is a LOT of current pushing the "best" wall power into a system tha...
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[quote user="Paul S"]But if I leave them down for a while, it might take 4 or 5 hours for them to get good.[/quote]Yes, it is exactly it. It is OK during the winter - sometimes run the power amps for days, but during the summer to run all 12 Milq’s c...
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I understand that AudioValve would like to keep their generic chasses for all their models but I think what they did with Assistant 100 amp is very wrong in term of chasses architecture. They claim the “special familiarity with 6C33C” but it is not w...
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Two days ago a local audio guy was visiting me and he was listing most of the day. When I asked him to comment on the playback problems he made insisted that sound has some brightness/harshness “around top E”. That was interesting as I know that it ...
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I have seen what kind cars Detroit makes…
I kidding. Thanks, Wojteck, I will consider it. I have to visualize what it will be. I know that it will be >80gain and it will be useing my long-time-ago-prepared capacitors but there are some problems t...
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"... and I do not know if 3A/167M is better than anything else and I do not see why the metal socket is necessarily better then plastic – the socket is not the part of the tube."As you know, the 437A is like an on-steroids ECC83, ALL glass built, no ...
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Your comments are quite funny and contrary to the facts. Romy can hear, as I can too, the difference between solid state amplification and tube amplification because his system is properly setup and can resolve all the nuances. The slightest com...
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[quote user="Romy the Cat"]
cv wrote:
I wonder if it is the reactive components (blocking caps etc) that are to blame here, seeing as much of the problem is in the lower bass.Chris, what you said made me to think.
Loo...
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I would say that there are advancements where you would get far more unanimity on the progress that had been made than one would do for audio after the development of tape. I don't think anyone would want to go back to cylinders. So there are advance...
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Jam,Yes, as I now see, you are right that the bearing was merely filled to the rim with oil and that it doesn’t have a pump feature (like some older turntable bearings did). And yes, the lead is touted for anti-seize (mostly copper these days), but a...
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It was a bit tricky to make it works. The Schwarz original crystal is imposable to get and the new one that I got from ICMC had different internal capacitance, so I was forced to shut them with additional inductance to let the oscillators to fire up ...
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[quote user="Thorsten"]If you do, do seek out old Air dielectric AM tuning Capacitors. You only need 110pF & 330pF, both can be found suitably. Once you tuned the RIAA to perfection simply superglue the shaft in.... I used to use that trick in pr...
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In the world or audio you
learn new and interesting facts every day.
AC caps (ceramic, electrolytic, polyester and polypropylene metallized foil types) can buzz at various frequencies.
This is not nonsense, and is quite normal behav...
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Here is the general specification for the parts that I used. The selection of the parts implies some liberty of course. It will be your amp after all, not mine - do whatever you wish. In some case when I feel that requirement is critical I will stres...
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