kevin gilmore

One of the people in the machine shop was not amused at last years thing. So no hazardous materials. Nothing radioactive, no beryllium copper, no asbestos... No loud screeching noises attempting to machine damascus... And yes the hammer did take quite a while to machine. justin came up with the idea of a magnetic levitation table for the BHSE...

OK, so every year about this time, i decide to do something silly and over the top. Last year was the titanium hammer. I need ideas for this year. Has to involve computer controlled machine tools. Has to involve expensive raw materials... Obviously it has to be practically useless.

Not going to happen! A couple of people i trust, maybe. Only 3 people can fit in the media room these days. (or me plus tyll and then the couch is full) Too much stuff, and not enough square feet. And the house is 3300 sq ft.

The uninvite was delivered personally. If my office mate was not there, i might have punched the guy out. Evidently according to my office mate, the guy had stopped by 3 or 4 times in the last week trying to find me. Skinny tall asian with bad teeth. Won't say more. I never had any intentions of going to billy's thing. As far as i know, billy has nothing to do with this, its not his style. The amount of stuff asked for would not even fit in my car in one trip anyway. I do have lots of new stuff, but showing off a $10k preamp in that kind of crowd would be a serious waste of time as i have no intentions of publishing the schematics and if justin would decide to build and sell the thing it would be 2 or more years away. The fight between ray's electrostatic fanboys and mikhail's electrostatic fanboys should be highly entertaining.

And a certain person just stopped by my office and begged me for a BH, BHSE, aristaeus, and a SACD standard for the weekend show. I was specifically not invited as it would upset ray. He really thought i was going to give him that pile of stuff on his "good name" alone. Ray already owns an aristaeus anyway, and if he wants a BHSE, he can buy one just like everyone else.

plan on an entire can of wd-40 to get that thing clean.

That may or may not be a custom machined piece. It is certainly not a step drill bit, that would be concentric circles. There is a reamer bit for 1.5 inch or so iron pipe that looks a lot like that. maybe the tip of something like this http://burlington.craigslist.org/tls/902589360.html

what you want is half of the electromagnet pictured here to do the tricks you want. http://gilmore.chem.northwestern.edu/electromagnet.jpg A couple of little details. 4 Tesla inside the gap. Weight of magnet 4300 lbs. Runs on a DC amplifier that is up to 60 volts at 25 amperes. WATER COOLED... I have an old 3000 lb magnet from a VG sector instrument. You can have it for free. You pay for shipping, or your pick it up. Weighs about 2500 lbs. Also needs water cooling.

Northwestern University has an entire building just for nano stuff. And 6 professors doing lots of interesting things with nanotubes and nanoparticles. Can't say much till the patents are filed. But it is ultra neat... In theory you could make an electrostatic diaphram out of nanotubes, and be able to drive it push pull with no more than about 30 volts. And it would be very efficient. (i.e. loud, very loud) By the way, since its halloween http://gilmore.chem.northwestern.edu/h2008-5.jpg http://gilmore.chem.northwestern.edu/h2008-6.jpg http://gilmore.chem.northwestern.edu/h2008-7.jpg http://gilmore.chem.northwestern.edu/h2008-8.jpg http://gilmore.chem.northwestern.edu/h2008-9.jpg http://gilmore.chem.northwestern.edu/h2008-10.jpg http://gilmore.chem.northwestern.edu/h2008-11.jpg http://gilmore.chem.northwestern.edu/h2008-12.jpg http://gilmore.chem.northwestern.edu/h2008-13.jpg

Certainly NOT a T2. Stacked output transistors. I've stayed away from designs like this because thermal tracking and bias problems can be very tricky. 1 extra milliamp in the output stage, and lots of burned up parts. If you do it as class B strictly as Koss does and put lots of feedback around it, it sounds like shit. At least it has the posibility of being completely DC coupled. It may in fact work really well. Someone would have to actually build it. with a total voltage supply of 1320 volts, the ratings on the output transistors is pushed past their max of 1200 volts. Clip the amplifier a few times and it likely smokes. Schematic as shown has an obvious and severe error at the minus input of the front end being grounded.

How much you wanna spend ?? Its this thing called johnson noise and is strictly due to the temperature of the amplifying parts... Which is why on my new cryoprobe, the 2 active preamps are cooled to 50 Kelvin. You get about 20db less noise this way. You can get most of the way there by dumping your amplifier into liquid N2.

NUCULAR isn't that how george bush spells it.... It certainly is how he pronounces it...

I smell a high priced military spec modification service being offered by APL. Say $1500 to modify your sr-71a. Actually a pair of the appropriately rated CRD's or fets wired for same would be better than either diodes, or resistors.

If this is true, then it is likely that the batteries charging the capacitors is causing an overcurrent condition and the batteries are turning off. Look up what the maximum output current for the battery is, replace the diodes with resistors to limit the maximum current. Should work fine. And drop less than the .7 volts that the diodes require. Don't ever get the batteries in backwards.

Because i'm to busy... My guess is that the current draw is actually too low to keep the battery protection circuit turned on. Some of the Li-ion batteries do that. They are designed for a minimum of 10% power draw. And justin clearly knows more about that circuit than resistor ray.

We now need a picture of tyll in a hawaii shirt, and a thong sitting on the bike... Then the people behind him really will have a crack in their windshield.

These headphones are comfy, block outside noise - CNN.com

This unit is just like every single other thing rudi has made. The finish is called solderbrite. The boards are still layed out by hand as evidenced the parallel traces not being parallel. Audio Research still does a lot of their stuff this way. The finish lasts no more than about 10 years before corrosion starts to cause trouble. I did a set of prototype boards this way about 20 years ago. And decided never again. it is a bunch cheaper because 2 less masks are needed.

No conformal circuit board coating on a portable?? Bad idea. Really bad idea. Very cheap ripoff of a tomahawk which is a ripoff of a ....

you are going to have beelly to recreate the sr71 hot tub incident

And done.

And replacing the electrostatic tweeter is going to be next to impossible, and i know of no one that is reconditioning those things. Still a very sweet speaker.

klh 9's soundlabs (with the direct drive tube amp) martin logan's dayton wrights (with piezo tweeters) esl56's tripple stacked with decca ribbon tweeters esl63's crown esl's with 15 inch dynamic bass drivers beveridge had them all, still have the esl63's

unscrew the connector, stretch out the techflex, pushing it back thru the rubber, use a single small cable tie to secure it.