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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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On the sansui, I tried using ferrite on all the rear inputs. No change in noise level.
On the ad122, I wrapped a single large donut around the interconnects,
which are supposedly shielded, but no change in noise level. I tried
putting ferrite ...
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Romy, I am aware that you don't kid around as much as some people might think, but I have known you to do it.Scotch =/> 50% H20.So, if you are in fact using Scotch to "good effect" (for the PADs; not for listening sessions...), then I guess this p...
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[quote user="Paul S"]Amir, please report methodology and results, whether positive or negative.[/quote]OK I Will[quote user="Paul S"]Again, oscilloscope traces of PP output have been posted in this long thread showing conclusively that PP output is N...
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but you have just +/- described an approach to cooty fighting that is already pretty popular with the tech-ies out there. This general idea is the basis for some very sophistocated attempts to quiet lines used for lab equipment, including ...
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[quote user="el`Ol"] Hello Romy, have you searched for explainations for these observations? Are there others who made the same observations and tried to explain them? Does the damping factor play a role?From my limited experience I can say that ...
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Jim, I do not know what to say: I never experienced any nose problem with it. A few years ago I built 2 mono phonocorrectors with 7788 at input as a pentode both of them were just nice and quiet and did not give me any problems in noise department. T...
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Hi Scooter,
First of all, thank you for the Mac check list. Very helpful!About this Mac>More info>USB Device Tree: I appear to be able to select a dedicated port.My Revox B-260 S tuner seems immune to the Lavry at this point. I have a ferri...
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Jarek, please re-read my previous post, also Romy's recent post on this subject, carefully. I'm afraid you are in for it once you start effing with power cords, for all the reasons we've listed. Here in the US we have a company that sells used cord...
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Hello guys! I got an old Coral X-VIII from Japan. Its an Onken enclosure with a 400 Hz horn. And I want to give it a second life. The enclosure looks already like new. And the question is about the crossover. What would be the theoretical best points...
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Folks,A maker of Magnetics reading along has taken me privatly a little to task, it seems I was not clear enough with some of my statements, apologies.First, I seemingly stated that Amorphous material was "always iron", that was not my intention, amo...
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Romy,The common mode noise will lie between 5 meg and 8meg or 8 meg to 12 meg depending upon whether it is forward or backward mode working. It does not have much to do with the 30Kilohertz.It is possibly true that one unit may have filters to keep ...
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[quote user="skushino"]Have you considered the opportunity of raising your upper bass HP crossover? How high do you plan to use your mid bass horns? If your mid bass is comfortable playing up to 280hz (or whatever the right freq is), you can use yo...
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Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source? I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving ...
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Well, I have to admit that the stupendous sensitivity that Sansui TU-1X have after the Stereo Surgeons tune up to use the TU-1X is kind of complicated. With 0.8mkV this tuner picks the noise that my DACs radiate. I staffed all wholes of the Sansui’s ...
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John, what you say
about power factor correction is completely accurate and very much makes sense.
There is a many ways to do it BTW. You can do it with caps compensating the
inductive load, you can do it with filtration or you can add active SS c...
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I see, let me to explain how the this work all together the you will be able to make your own judgement. Let look at the functional purpose of the emails in there. The R1 resistor is a loading resistor. This is understandable. It makes sense to kee...
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Well, I cannot say that i have much interest in the installations on his Facebook page and this should be a strong indicator of the type of audience being targeted by the driver manufacturer.Nonetheless, he has sent me some frequency responses, but n...
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I received a comment form people who reportedly well-familiar with using the high-frequency high gain tubes. They suggested me that the resistor between screen and grid (R23) might be eliminated and that would bring some benefits. It very much might ...
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...but it will take me N-years and I'm in EU :)I could make some preliminary steps this Easter, talk to my winders about transformers etc.I'm for sure missing the FW and out put cores (AMCC800A will not support 120H at 300mA, low DCR), but getting ma...
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Well, John, I had a feeling it was something like this. Plenty to process. It looks like the only "easy" road for the DIY crowd here at this point would be (isolated) filament supplies using your pre-loaded boards. In the meantime, I seriously dou...
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"Do not use plastic caps ... but go for a tandem of electrolytics Nichicons with active biasing."
Hi Romy,
Please excuse my ignorance. Can you please clarify what you mean by "active biasing" -- in relation to the caps?
I'm thinking to get...
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[quote user="Dominic"] i thought of it as soft and chalked it up to not being as strong a motor as was needed and begrudgingly accepted that perhaps 'field coil' did not mean 'powerful motor'. I'm starting to think otherwise…[/quote]
Yes, it is exac...
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Klaus,
The 515-8GPH were in same scale as the 515G with slightly above 35Hz resonance frequency and 103 sensitivity - a very good candidate for 60Hz horn. The 10” throat? No bolls to go for 9”, how about 8”? I’m just kidding. The throat ...
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Here is the signal box:The design is double mono past the VR's. Including the bias.
The coupling caps are Arcotronics KP172 from RS-Online, quite prised by Thorsten Loesch. THey are sitting on
sorbothane pads. The air caps are: 1) 365pF some +/- s...
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[quote user="Romy the Cat"]Hi Romy!
The 515-8GPH were in same scale as the 515G with slightly above 35Hz resonance frequency and 103 sensitivity - a very good candidate for 60Hz horn. The 10” throat? No bolls to go for 9”, how about 8”? ...
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[quote user="Romy the Cat"]Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source?*1 I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bi...
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Alas, no time for anything at the moment, the listening valuation must await construction of the amps (and speakers...)Also, it is a very custom application - it is designed to drive an array of ribbon tweeters. Normally these have matching transform...
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I will address the low voltage DAC power supply first since it has multiple applications.The front end comprises a commercial 48/12 volt 20 watt dc/dc converter. This basically is used to provide 1000 volt isolation input to output otherwise you...
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[quote user="CO"] May i ask if you have ever played with the Le Cleach flares and how you find them?They were created to reduce reflections directly back into the horn. Only problem is they are very large because of this.... [/quote]
Nope. I never h...
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The other night I listened to a Girl with Guitar master tape. A friend has a home recording studio that would make most comercial studios not only jelaous, but also broke. A highly modded ATR 102 in 1/4" half track and a vintage stereo microphone; ...
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