kevin gilmore

I love it when a plan comes together.

The important fets are super glued together back to back. I don't want to mess with it and risk destroying it because there are no replacements. The others have no markings on them other than the part number and that typically means the BL... It sure seems that each and every unit had different resistors to adjust gain and DC balance. I may have found suitable replacement parts, but i have to build and test... But first i have to order a bunch of them. The klyne are an all opamp design with the opamps made from discrete parts. Really the same thing as the vendetta, and many others. Only way to get the noise down is with discrete parts.

First power supply working and tests at a total of noise of 300 nanovolts peak to peak. (under slightly more than full load of 200ma) I was hoping for better, but this is measured outside of a screen room, so it may actually be lower.

I predict that blubliss should be listening to a wonderful staxmass very soon. Both channels now adjusted to the right numbers. (servo's are a wonderful thing when they work)

A pair of lm317 3 terminal regulators feeding fets as current sources feeding pass fets. Cheap and effective. $20k blowtorch does exactly the same thing. You can certainly do much better these days including tracking regulators to reduce the pumping of the servo's. And much lower noise. I saw a schematic for the klyne a while back, no idea if it was accurate or not, the modules are just discrete fet opamps. The sutherland is an expensive joke. The ayre is much more my style these days

fixed... If you are building it yourself, the xono is going to be easier. But the xono has coupling capacitors between the stages and at the output. So if you want DC coupling... (required riaa network is always going to require capacitors) Its a shame no one has done the input stage as balanced. Makes all the sense in the world for reducing hum.

this should raise a few eyebrows a christmas present for all head-casers... taken from an actual device, so if i did it right, it should be 100% correct, and the only known complete schematic (not including a pair of lm317 pre-regulators) http://gilmore.chem.northwestern.edu/vendetta.pdf

I should have a working "supersillious" power supply for this thing in the next couple of days. Hybrid voltage controlled current source feeding a dual tracking shunt regulator.

just got an email from mouser that the 5pf caps are 1 year away... will find another one soon. A friend found a source for glass infused peek screws... I think i have to buy 500 of them minimum, but they are only $1 each.

blubliss goes to confession... Gotta love current limited power supplies !!! And one channel survived completely intact anyway. Pretty strong circuit design.

one channel works, the other does not. pretty sure that the tops of the batteries on the channel that does not work are about 10 or 20 volts and should be 200. Will know more once i know the cathode and grid voltages of U2. Could be that the servo is messed up. Actually all the sources are on at the same time. About 5kw total source power.

Well its the amount of flux, and the size of the beam that is of the most importance. So for all these new drugs we are working on, where you can only grow pure crystals that are 50 microns in diameter, these new sources generate much more accurate data, and a bunch quicker. I grow tomatoes at home, very nice tomatoes. With special fertilizer that i mix up from the good stuff. I'm trying to figure out if blubliss has a problem in one channel, or a balance issue. If its a balance issue, the circuit ping-pongs till both batteries in a channel are close enough. Pretty much the same way with the BHSE.

This is why i have been so drop dead exhausted for the last 3 weeks. Almost done now. http://gilmore.chem.northwestern.edu/xrayduo.jpg http://gilmore.chem.northwestern.edu/xraytriumph.jpg http://gilmore.chem.northwestern.edu/xrayprospector.jpg http://gilmore.chem.northwestern.edu/xrayfamily.jpg Seems that we have risen to the top of the food chain, at least in the USA (poor MIT) Should be getting back into audio design in a big way soon.

I have chips in my kyocera ceramic knives just from the knife hitting pieces of beef or chicken bones. They do break. The macor i use (machinable glass ceramic) works great in compression mode, but absolutely horrible in the other direction.

So 26 volts peak to peak is about 9 vrms, which into hd800's results in a maximum volume level of a bit over 110 db spl. Dangerously loud. Ray samuels loud.

I would love to buy some ceramic screws. Where do i get #4-40 x .75?

I have no doubt that the sr71b is actually ray's best amplifier ever. And that includes all of his expensive stuff. Pretty sad that it is just a balanced meta42. In balanced mode, since the buf634 really does not like to drive less than 50 ohms (100 ohms balanced) i don't see it as a good match for low impedance headphones. I'm going to work up the numbers shortly, but at a minimum of 1.5 ma per buffer, at 30 volts nominal power supply the no audio standing power is 180 milliwatts. Not counting the switching power supply, and the other opamps. So i think even 16 hours actually making music is a bit optimistic.

well at least ray is now a head-fi sponsor. I'll bet jude gave him a great deal. Virtually identical ibasso product comming soon for about half the price. How many people are actually interested in a device like this that is going to eat batteries alive?

No its 4 individual diodes, so the quantity is correct. Any 1200 volt fast recovery diode works. Actually any 1000 volt to220 diode works. Used to be the st parts, those are out of stock too there are new versions of the st parts in stock. updated bom with a couple of fixes. alternate 680uf cap in stock is 667-eet-uq2w681ea definitely fits. like the T2, some parts were on backorder. Just spent 2 hours stuffing resistors. somehow forgot to order 3 values. more parts stuffing later today.

My boss bought me an aeron chair because of my back trouble. Makes a huge difference. He bought them from a store in northfield illinois, i don't rememeber the name, but all the chairs had slight blemishes, and they were about $500 with all the extra goodies. Still overpriced, but if you have to spend more than 4 hours a day in one, worth it. Also built like a tank with lots of cast aluminum pieces. And repairable if you should manage to tear the fabric.

Thats the first small prototype run, hence the increased cost. Someone else made them, not me. Its the reason why i'm not going to do another T2 board run.

more than 1600V p-p probably closer to 1700V p-p even more if you use the ixys parts for the current sources.

500 ohms is the correct value. Actually either one works, 500 ohms puts a bit more current into the 3rd stage.

Trouble with corvettes is all the standby current used by the alarm and onstar, so batteries don't last as long as they should. updated bom http://gilmore.chem.northwestern.edu/kgsshv.xlsx

Just noticed the silkscreen legend is missing... Will fix that later today. Will add the .47 caps to the bom later too. Had to stop by the car dealer for a new battery yesterday. 4.5 years is way more than most people get. And had the serpentine belts replaced because they were squeeking.