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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy, I have futzed around with caps more than I should have, mostly because they so obviously affect the sound, no matter where they are in the circuit. In general, it seems like the best bet is to keep the values as small as possible, an...
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The problem with my unit was that in A/D of one channel there was some kind of “very high precision capacitor” the value of which drifted. That offset the A/D and presented the unit to but up. There were a few other minor things that they found and a...
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I have already got a tape recorder and now here is what I am thinking. Since there are quite a few tapes with Dolby A, Dolby B, Dolby c, Dolby S, Dolby SR, DBX and since some of the tapes were not properly EQ I would need an abili...
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Vp = 240v, Vg = -90v, Ip = 165 ma, RL=1k5, 10W, H2 = 6.9%, H3=1%, H4=0.2% I used it with cathode bias (used 50w resitor, backed by 10x200uF capacitor). How it sounded - warm and punchy. I had an amp with F-3 about ...
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[quote user="Romy the Cat"]I have seen in it in photographic flashes[/quote]Wow, this is news to me. Makes perfect sense, though. [quote user="he also"]likely due to the memory in formatting[/quote]Yes, electrolytics are funny devices.&nb...
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[quote user="Bud"]Sounds to me like your switch mode transformer is doing the buzzing... There is always a turn on buzz, but just for about 10 seconds. The original one had a noisy fan also, to keep it from self igniting, perhaps that is your actual ...
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The answer will be a complicated one, as the preamp is driving an active crossover. The many storage elements means the impedance is a function of frequency. There is no "10k ohms" answer. I hope you are driving these network with s...
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It is wonderful how these forums work and how it's members provide the feedback and comments from their experiences and expertise.I am 90% convinced that the DEQX will not provide the magic spatial sound that I am looking for with the Edgarhorns....
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Yes. Their is a direct correlation between surge current and dielectric materials dielectric constant. The voltages in question are high enough to use a thick dielectric material and just as with the effective resistance of the capacitor, there is a ...
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All records, particularly from good period, were recorded at different equalization. Even the records that were RIAA marked were in fact WAY off…How to deal with it? Running a feedback to high impedance, in the way how it made in EAR 384P, permited u...
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Hi Rowuk,Thanks for reply, I use step up transformers, old Partridge 1:12 I think they are model 973B if memory serves me correctly. I haven't installed the ART7 yet. I currently use another AT cartridge - 33ptg ii which is a more "normal" output of ...
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I think I found a good configuration for de-emphasis. The air caps will not work as there is nothing to amplify the capacitance. RC filer with cap to ground is good but I would like to have the entire de-emphasis with no capacitor at all, it will be ...
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heres a question for the lot of you-due to general lack of many available capacitors in my shop-- i recently mixed both film AND oil caps to pull together a necessary value for a passive crossover. the GOOD of it, is that it takes away some of ...
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The "funny" thing is, the part that "sounds the best" in one situation might not do as well in another situation. A great example I can remember is the fabled Vishay S102 resistor at the grid. Great for stepped attenuators; not good at all at the gri...
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Every resistor, capacitor, tube, etc. are just physical devices that are optimized to come a bit closer to an ideal device -- a wirewound resistor may represent an ideal resistor, but it has inductance, capacitance, and other electrical and physical ...
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[quote user="drdna"] Actually, I believe they can be tailor made to your exact specifications, which at that price they should be.[/quote]
It is not a thread about cup but I still….
This is always an interesting question to me – where is the thres...
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[quote user="Joe Roberts"]At Munich, we cranked the Aporias up with a 20w 845 SE and they did not catch on fire but our goal for the speaker is "big horn sound in normal sized rooms"--and 8W will do that.[/quote]The Manger catches on fire with some m...
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We should always remember that VL designs by design, rather than with his ears. While I would guess it's OK to sub 950s for 935s, at the same time I'll bet VL has taken into account ESR and other parameters that the average capacitor-swapper mi...
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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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I am taking about coupling capacitor between driver tube and the DHT. There are zillion way to do it and no one said that they need to be used. No one proved yet that a very good quality of caps shell be worse than other methods. In my case since the...
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Maybe if you didn't try to pull the caps down so fast. Why the hurry? Maybe a 500 ohm or 5k ohm resistor would be a more kind bleeder. I think the peak current spike is not such a good thing for the capacitor. You are also at ...
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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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I read about the GU-81 penthode. It's probably a good possible solution, thank you.I haven't so much experience with penthode, from my very few experiences, I felt better with triodes (DHT or IDHT), so I prefer don't take any risk.I feel more and mor...
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I had some experience with bad electricity so i would like to share it here. My audio system does not have ground loop. 1- digital sources (I have CD Player) is more sensitive to Bad Electricity than Pre/Powers. 2- if your audio system Continuously p...
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Roman, the reformation of capacitors is an unswer in many cases. Those, who use BG - have to spend approximatly the same time to bring the system to the proper sound, but your mind is not SO corrupted. You use relatively big tanks o...
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Since I know about a few ongoing attempts out there by different people to build Melquiades I would like to share with some of my observations regarding corrections, simplification and possible modifications of Melquiades amplifier.
Obviously you ha...
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Jessie, I have two comments/questions.
Are you sure that using the USB you do not use the sound card? I am a software guy not a hardware guy and with my limited understanding I presume that an application that reads a file must talk to so kind of dr...
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[quote user="perrew"]Romy,
I might be confused with the passive and active, but from my understanding you prefer your active 834PT to the passive RC network and passive LCR networks. You also prefer the passive LCR to the passive RC. So 834PT&...
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[quote user="Romy the Cat"]Anthony, I think you take the right this in a wrong way.
Sure the quality of the coupling caps is important but you truly shall not be worry
about it. Make the amp, get comfortable with it and then change the damn cap.
I...
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[quote user="Romy the Cat"][quote user="drdna"]I would like to start a compendium of anecdotal observations of the idiosyncratic nature of COMPONENT PLACEMENTS in the circuit. [/quote]Surely all passive components in the circuit have influence, but I...
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