Ed you're full of surprises, Olde Harry is synonymous with Satan. Are you familiar with Boyd Rice and his works?
Tell them you know someone with a "Q"clearance and watch their eyes get big. I did that at a dinner in Washington DC at Canadian ambassadors home and the woman's eyes got big... was speechless and soon afterwards left. From her response, i just said to her. .... ah, you know.
-RNM
The guys from CALTECH will be there and we plan on a discussion around the actual schematics. The socket in question is the active supply setting the laser current/amplitude. It needs 1 part in 10^^9 amplitude stability (yes PSRR). Ironically they actually rolled op-amps, I'll never live it down, and came upon their solution. As I mentioned before the instrument noise floor is unit-less and given in strain which is a delta length over length of ~10^^-23.
BTW it's in Hanford a place you must know enough about to have to kill us if you talked.
Eastern Washington is quite beautiful country too. Hopefully you get to enjoy some of it.
Hery R. Is the president of Madagascar. Just busting W's chops.
As W would put it I have all of LaVeys movies.
I just always assumed you had a "Q" clearance. I did work for a bit with an ex-navy submariner and he would not even admit to the letter classification system. In the old days I had friends my father's age with gold chains tightly around their necks with a second loop holding the enclosed ID card. Really stood out at the swimming club.
Being stuck in the midst was the worst. I had to work under such magic believers. I decsribed it once as "audio LSD".
The audiophile media transformed you into a historical trooper by constantly referring to Picking Capacitors.
And the marketing department Marsh Sound Design ~ Experience the Sound with Marsh Sound Design Products !!!
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I think that we should talk more about wires, their construction, 'distortion', directionality, and any other factor that might make an audible difference.
I seriously consider wire differences a mystery that has not been completely solved, yet there is a lot of info out there about measured differences, including measurements by Dr. VandenHul, Dr. Malcolm Hawksford, and Ed Simon, for example. Those who do not seriously attempt to REPEAT their experiments have little reason to condemn them. I know each of these individuals personally, and I know each of them are both educated and interested in audio differences. Condemning them without proof, seems to be the norm these days, but it does not help the matter.
I realize that almost all 'subtle' differences in audio wires, or many other products, takes open listening---at least, blind A versus B comparisons, but not ABX comparisons. Still, that is how we hear, and if we want real results, we have to work with what works, rather than what throws out anything that does not meet an ABX test. I have long noted that ABX testing is 'flawed' somehow, and I have a number of reasons for believing I am right, but I will not go into it here. Too much flak, (I will get plenty already), so I will only say that over a relatively long listening period, I do believe that audio cables, and internal wiring are audible, and often NOT random in their effect. I personally take it into consideration with each design and audio system that I use. To ignore it is at your own loss.
I seriously consider wire differences a mystery that has not been completely solved, yet there is a lot of info out there about measured differences, including measurements by Dr. VandenHul, Dr. Malcolm Hawksford, and Ed Simon, for example. Those who do not seriously attempt to REPEAT their experiments have little reason to condemn them. I know each of these individuals personally, and I know each of them are both educated and interested in audio differences. Condemning them without proof, seems to be the norm these days, but it does not help the matter.
I realize that almost all 'subtle' differences in audio wires, or many other products, takes open listening---at least, blind A versus B comparisons, but not ABX comparisons. Still, that is how we hear, and if we want real results, we have to work with what works, rather than what throws out anything that does not meet an ABX test. I have long noted that ABX testing is 'flawed' somehow, and I have a number of reasons for believing I am right, but I will not go into it here. Too much flak, (I will get plenty already), so I will only say that over a relatively long listening period, I do believe that audio cables, and internal wiring are audible, and often NOT random in their effect. I personally take it into consideration with each design and audio system that I use. To ignore it is at your own loss.
Sure, wires are imperfect for various reasons. Other imperfections occur where the materials in wires connect to other materials, such as solder. So, sure, the question is can you hear it, and if so, under what circumstances, and with what reliability?
Regarding ABX testing, I would like to hear arguments against it. There may be some, but there are also substantial merits to the methodology if performed correctly.
Regarding ABX testing, I would like to hear arguments against it. There may be some, but there are also substantial merits to the methodology if performed correctly.
IIRC, those brands belong to same mfr (National, Lavear). It's all Panasonic now. From my choices here to use, it is the best one for THD and IM. Fast and accurate and easy to use. Second would be my ShibaSoku 725D but the filters add a lot of noise in some conditions. The A-P is the last but certainly not least as it can do so many more tests. It is accurate but not a quick setup and needs a lot of time to get thru the software usage/learning curve. Still some bugs.
--Mr Marsh
AFAIK, Panasonic is out of the instrumentation biz entirely.
Levear, being out of China, answers no emails from this side of the pond - hard to know how they expect to sell anything, but they probably have a captive market in China...
If anyone stumbles across a bonafide manual, users or preferably SERVICE, or a SCHEMATIC for the VP-7725 (any version) please contact me - I'd pay for the latter two...
I spent two years trying to track down this documentation. No luck.
Since Panasonic pulled out, they apparently trashed all the documentation.
Oh, btw, the Euro and other non-USA distributors are totally non responsive. Makes me think that there is some sort of clandestine operation having nothing to do with audio going on.
If Panasonic is back in, that would be interesting.
_-_-
Do you think if a person never heard water be poured before, they could tell the difference between cold, warm, or hot being poured? You and I can.
ABX tests can be counterproductive if one is not aware that mediocre gear can sound "better" precisely because it is of poor fidelity, so measurements are necessary to make sure that an eventual audible difference is not interpreted at odds with its real meaning.
Do you think if a person never heard water be poured before, they could tell the difference between cold, warm, or hot being poured? You and I can.
Obviously, we learn to recognize many sounds, often in very complex ways, such as speech. I don't know what connection that has to do ABX testing per se. Maybe you mean someone should have an opportunity to learn the sound of something before being tested to see if they can reliably recognize it. If so, no problem there. Practice is fine. When you think you can recognize the sound then take the test, right?
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