kevin gilmore

fuse now shorting against one of the transformer pins. needs to be fixed. Transformer needs to be loosened up and moved a bit, and some kind of insulation between the fuse holder and the transformer.

As long as 630 volt capacitors are available, there is no reason why the power supply can't go to +/-550. All the parts are rated for 600 volts. Or stack 350 volt caps. At which point DIY is not recommended except for people who really know what they are doing. Did not see any pictures of ray's new electrostatic amp at canjam :'(

A much more extreme BH supply is coming. Maybe another 10 months. Should be available as an upgrade to all the new stuff including the BHSE. Won't be cheap. Trust me on this one, MUCH MORE EXTREME. Dual tracking 4 stage shunt regulation design.

I did design an amp for the TakeT... Plenty of drive oomph. No way to test it yet... Those things definitely eat lots of current. Hook them up to the primary side of a push pull tube amp. 60 watt amp should be plenty.

Done. Maybe if there is a national meet next year in chicago i'll bring mine. And yes the real blowtorch chassis was pretty over the top. My new preamp, which both is and is not a clone of the john curl design has been prototyped, but no board layout, or anything like that. It will not be the same silly over the top chassis. The front end amplifier is both a completely balanced to balanced converter, and a unbalanced to balanced converter at the same time. So that the output impedance of the front end amplifier to the attenuator is identical in both modes. After the attenuator there is a line driver amplifier. The original blowtorch is only unbalanced to balanced. Maybe when its stinkin hot this summer i will do the preamp board layout.

The guy has clearly learned how to break into the cable just like MIT and Transparent do to their high priced cables.

good flash and flash cord extender great for making sure there is no glare.

actually once in a while they will cooperate http://gilmore.chem.northwestern.edu/dogs.jpg (warning large) tristan,isolde,don giovanni,leporello,karmen (daddy, mommy, and the three kids)

and i thought 5 yorkies was a lot...

thats what the shorting wire is for. And after charging it and discharging it, and the shorting wire on for 4 hours, i took it off, and within minutes it was over 100 volts.

I think you are right billy. Maybe i'll give one to ray and he can build it into a portable tomahawk. If he scales everything up to the size of the cap, it would be very impressive. And need a fork lift to move. Its not really the right form factor, so he will need two in series.

Without any manufacturer markings or any other information, figuring out the max voltage is tough. Could saw the thing in half and measure the thickness of the dielectric (not going to happen). Or try and guess what the hell someone would do with such a thing. 1) could be the output cap for a VLF transmitter. Just one would be good for 100kw. AM radio <1mhz possible... 1000 volts into 50 ohms... 2) could be the output cap for a very high rep rate xenon flash. after that i'm out of ideas.

Can't be a 5000 volt cap. That would be too much energy storage. Starts to spark at 1400 volts. So at a 1kv rating that is still 1000 joules. More than twice as much needed to stop your heart.

So I was out doing errands yesterday and came across a garage sale with lots and lots of electronic stuff. Highly unusual. The guy's wife had recently passed away and he was getting rid of all of his collection over the years. Suffice it to say i bought one standard corvette's trunk worth of stuff, and will go back and get more today. Anyway he had these capacitors i had to have. He said they were for a top secret military project in the very early 1960's. There are no labels on the things, or they came off years ago. He said they were 1000 uf/5000 v caps. So i brought one into work and sure enough it really is almost exactly 1000 uf. He said they were teflon film caps. It weighs more than 20 lbs. Absolutely the perfect OTL output cap for dynamic headphones. Mikhail is going to need a bigger chassis. He had a total of a dozen of them... If i get the rest i'll send a pair to mikhail as a present. http://gilmore.chem.northwestern.edu/bigcap2.jpg Trying to find a ruler now, but my micrometer says its 7 inches in diameter.

Really Ya think??? DOH

Nope. Amplifier is fully balanced output. Single ended input, or balanced input does not matter.

The stuff i have indicates that this is not true for that unit. Besides which 2 meg into a 10 meg dvm would still be 395 volts and that is still low.

It is affordable. Besides which half the cost is the name on the front. Sort of like Zenith used to be. The quality goes in before the name goes on

much better is a few grams of mercury in their front and back yards, and on the front steps. Takes a few months...

posted on headwize 2 versions of each board, one with the fets i like, one with the fets amb likes one with heatsinks on the board, one with the bracket version http://gilmore.chem.northwestern.edu/dynahifetr.zip http://gilmore.chem.northwestern.edu/dynahifetrhs.zip http://gilmore.chem.northwestern.edu/dynahifeti.zip http://gilmore.chem.northwestern.edu/dynahifetihs.zip knock your socks off

I published 4 different board layouts. Complete, ready to go to a board house. Find someone who wants no end of aggrivation to make a group board buy... Ain't gonna be me...

Something is definitely wrong with the bias circuit if you measure only 380 volts before the ballast resistor. Likely one of the 2 diodes.

Actually a well built dynafet. Trouble is no one is building them right now, if it is on justin's list it is likely 2 or 3 years from now... And i desperately don't want another occurance of trevor-networks plastic and superglued pieces of shit.

But clearly the problem was the glass of orange juice to go with the bacon and eggs.

here you go http://www.go2marine.com/category.do?no=13120 you can use the cable tie anchor mounts, or the plastic cable straps or what i was thinking was the line support clips. What i was originally referring to is called line support clips here...