kevin gilmore

This i believe. I however take at least 10 minutes to drink one. I must be seriously out of practice.

dry ice is -80c. liquid nitrogen is -200C (or so) liquid helium is -270C and is way the hell to expensive to try this with. (but i might anyway) I have plenty of dry ice, will try that next. I wonder what that would do to the taste of the drink if directly dumped into the booze. Likely turn it into a fizzie. Although i have a really nice new 25L dewar that fits in my car for carrying around N2, The dry ice might be a better idea. The ceramic balls i have are for high vacuum/low temperature work, and i tried it in liquid N2, and they did not break. The guys at work had the idea to take copper balls and coat them with teflon to make them innert. This is going to take a while to try, and my guess is that the teflon is going to crack due to differences in coefficients of expansion.

The plate resistors will be on the top side of the board with the tubes. All the rest of the stuff is going to be on the bottom of the board. Would mount the same way the T2 amp board does.

Another electrostatic release by the stax mafia 2 just this week http://gilmore.chem.northwestern.edu/bate.zip this needs checking, for errors, but all the sizes of the components have been checked with mouser.

That is why you plate the copper with gold. Or use surgical stainless balls. Or ceramic. The idea is to cool them down a bunch (i.e. liquid nitrogen) to keep jim's sazerac's cold for the length of time it takes to drink the whole thing. I've tried soapstone in liquid nitrogen, and it just cracks and turns to powder.

So a couple of you have purchased whiskey rocks, which got me to thinking about better things to use with more thermal mass. I came up with the idea of 1 gram pure .9999 silver bars. Or gold plated pure copper balls. What you think?

layout updated to support 12ax7,6dj8,6n1p ... http://gilmore.chem....rn.edu/bate.jpg yeah i know working on a low-res screen is a bitch. will update with higher resolution later. Could add current sources everywhere. Including the output tubes. That is going to increase the size and require heatsinks. As far as the resistor to the negative rail, Lots of people do that, but i see no reason to, and besides unless you are going to use a delay relay to turn on the high voltage, you would end up with 800 volts across a cold 12ax7. Which can't be a good thing. This is great sounding, about as simple as possible, and something anyone could build and get to work. Birgir can voice the thing by picking the capacitors, or anyone else can add comments. The only ones that need to be >800v are the ones between the 2nd and 3rd stages. Picture will be updated soon.

Try this one on for size... specifically 7.6 x 6.25 inches http://gilmore.chem....rn.edu/bate.jpg 4 x 12ax7 2 x 6BL7 same teflon sockets as the T2.

no one seems in the mood to do the pa89 group buy. I already have mine. So what do people think of this http://gilmore.chem.northwestern.edu/bate.pdf

anyone going to be upset if i insist on the teflon sockets?

how about 12ax7,12ax7,6cm7. won't be much bigger than that. The power supply however is going to be at least that size or bigger.

Yeah, it was compact. And yes it blew up. Evidently quite often. i'm thinking 3 x 6bl7 per channel, +/-400 power supplies, gilmore triode amp style with cathode bias and DC coupled output. Local feedback on the input, and local feedback on the output. unbalanced input only. (i'm thinking about this last bit) 10 amps of filament current.

I'm definitely liking the 6bl7 as it is a dual triode. So we could do an amp that is 3 octals per channel. Slightly bigger than i want, but ok if the tubes are cheap. Looking into 6p14 now.

So there is absolutely NO way we are going to do an A10 board due to all the issues we know about. But it would be nice to do something simple that anyone can build. So i'm looking for tubes that can handle at least 500 volts, anything there is bunches of that does not have stupid pricetags attached. And its not going to be SRPP either, because done right, you need at least 5 seperate filament supplies. 6s4's don't seem to be in plentiful supply any more. Otherwise its a circuit board that is bigger than it should be with multiple 6ca7's... Any ideas?

2 people asked for the gerber files, so here they are. this still needs checking for errors. http://gilmore.chem.northwestern.edu/ll.zip

I have both of you beat. Over 1200 sq feet in my basement just filled with electronic antiques.

Very close to done now, stuffable many different ways, mosfet/bipolar current source transistor/led stacked current source/single high voltage current source resistors/zener 400v/450v/500v http://gilmore.chem....edu/srm323s.jpg and .5 inch smaller in vertical direction than kgsshv which is what birgir wanted. Deepak, you asked for it, you got it. and here is the schematic which needs a bit of editing to show the rest of the options http://gilmore.chem....srm323splus.pdf And we now have an official name for the thing. Ljóstrandi leiftur I like it.

One of the women i work with is full up kosher. 2 of everything in the kitchen. Full up religious too. But when she goes out for dinner she will have ribs or things with bacon in them. I find this a massive contradiction. So i don't keep kosher. Besides which you usually cannot get kosher prime beef.

http://gilmore.chem....edu/srm323s.jpg you can use non-isolated mosfets if you want. you should use the bipolar listed for +/-400V you can use the 2sc4686a and the 2sa1486 in place of the ksa1156 and then go to +/-500V +/-15 volt supply not needed. Will add the LED current source option soon. Same exact size and hole placement as the kgsshv board

I should stop watching the cooking channel. matzoh balls wrapped in bacon. Going to have to try this.

Stone knobs coming soon. First some italian black specked marble Hopefully this week.

The LL is not any cheaper than the KGSSHV. In fact, done right, its slightly more expensive.

So do we do a circuit board that is identical to the LL production version, or do we do a modified version thats better? Off board or on board heatsinks version. Really, taking the kgsshv board layout, the last 2 stages are identical, so changing the front end it pretty trivial. And the kgsshv power supply works great at +/-400 volts with only 2 resistor changes. And its not a rummage sale... its a rubbish sale. Especially the rudistor clones.

And i get bottles of the black death in return. And goodies from birgir's bakery, whose version of fruit cake is just amazing. (not what we think of as fruit cake in the usa which is generally useful for pounding nails and not much else) Birgir calls the stuff "stolen" but stolen here is not anything like that. Its a great deal. Testing indicates that to get the same distortion levels as the kgsshv does at 18 watts per channel, you have to go to 38 watts per channel on alex's fet design. Or lower the power and suffer significant THD at higher frequencies. I completely expected this. All parts now ordered for the preamp and blackhole. Mouser must love me.

The connectors are on .2 inch centers. But i can certainly change it for production. There are right angle plugable connectors that work great, its the kind of connectors that crestron uses on just about all their products. Will look tomorrow.