kevin gilmore

If bigir finds me another T2 floating around for sale from a reputable dealer/person i would buy it just to add it to the collection of other things. I can do a better job 25 years later. But justin class chassis's are a whole bunch of work. At least i'm very now well familiar with the 3D milling machines and the software, so i can make a chassis with all sorts of pretty holes pretty easily And even go for completely custom one piece heatsinks. Then ship the stuff out for anodizing. Should cost about $1k for the chassis. Assuming the labor is free. The arlon circuit board makes no difference as the lower capacitance is definitely not necessary, and it probably would have to be much thicker to hold off the 1kv floating around. This is pretty close now after about 18 hours of work. http://gilmore.chem.northwestern.edu/staxt2rev0.bmp at least all the obvious errors are gone, and the ground plane has about 95% coverage once i add it.

3 days ! So if i'm an amateur what do you call mikhail...

The 6dj8's in the back next to the pot are the cascoded input stage.

I have a pair of Omega1's and i did try it. Very nice. I do have the BHSE prototype, and compared with that for (well all night and then some) Very close call, but the BHSE is ever so slightly better (no humm) But our version of the T2 is going to be better yet. (dc filaments) (fully regulated and tracking power supply) current board... http://gilmore.chem.northwestern.edu/staxt2rev0stereoproto1.bmp If you can't generate schematics from that in 15 minutes or less, you don't deserve to be messing with this.

more of the same http://gilmore.chem.northwestern.edu/staxt2-10.jpg http://gilmore.chem.northwestern.edu/staxt2-11.jpg http://gilmore.chem.northwestern.edu/staxt2-12.jpg http://gilmore.chem.northwestern.edu/staxt2-13.jpg http://gilmore.chem.northwestern.edu/staxt2-14.jpg http://gilmore.chem.northwestern.edu/staxt2-15.jpg http://gilmore.chem.northwestern.edu/staxt2-16.jpg http://gilmore.chem.northwestern.edu/staxt2-17.jpg http://gilmore.chem.northwestern.edu/staxt2-18.jpg http://gilmore.chem.northwestern.edu/staxt2-19.jpg The interconnect cable is just a bunch of regular wire in a bundle about .75 inches thick, permanently connected at the amp end. For those that don't recognize old stuff, the power supply connector is the same connector used on 14 inch SMD hard drives from years past. On the bottom pictures you can see the cable soldered to here, there and everywhere.

in high res bitmap form suitable for error checking http://gilmore.chem.northwestern.edu/staxt2rev0stereoproto1.bmp

Yep that is what you want. If you can get 2 of them, or 4 for the sr-007t and don't mind running without the covers, then give it a whirl. I still think it is a bad idea. 700 volts for a 6sn7 ??? Not a good thing.

Electrically maybe. Physically NOT A CHANCE. You would need an octal to 9 pin adapter. (the reverse of what you think) You would have to punch holes in the top of the chassis... Transformer will likely not have enough filament power.

I'd pay to watch mikhail build a point to point T2. It would be a work of art. I mean what else would you call it?

hydrogen thyratrons used as synchronous rectifiers are even better. Besides which they really light up purty. Of course you can substitute parts. But where is the fun in that. It may turn out that frank is using a much higher B+ (like 800 to 1200 volts) in which case the mercury rectifiers will actually be necessary. Pretty sure i heard that the electrostatic amp had a 1500 volt B+. In which case you do have to pay attention when you build stuff like this.

Actually the thing is that mercury rectifiers are a much stiffer and lower impedance device with much less voltage across them. That is why you use them. Its not the same thing. Otherwise you might as well use sand for the rectifiers...

I'll add it to the list of things to make circuit boards for... As soon as the schematic shows up. Really this is going to be way simple..... Compared to the T2.

money sent.

Where's mine. It will be a perfect match to what just showed up. Pictures later today

1kw of heat in the summer

More speakers than you might think. Its not about absolute power its about the ability to handle transients without clipping. 20 or more db of transients. And wilson X3's definitely need that kind of power. Although at 8 ohms its only 1kw per channel. Last price i saw was $160k per stereo pair.

You obviously need a pair of the krell master reference amps. For a combined weight of about 700 lbs for a stereo unit.

And none of that has anything to do with water damage. The electrolytic caps in the power supply of the amp are 25+ years old and need replacment. All Mcintosh switches get dirty and scratchy, especially the volume pot. The light bulbs go out all the time, and are very easily replaced. But evidently that is the cost of decent labor these days. Personally i think it is high, and if you send the stuff back to the factory they will do a better job and be a bit cheaper, plus come with a warranty. This is great classic Mcintosh stuff.

Nope you were not paying attention. Ray's hr2 is a dual power supply dc coupled unit. no caps in the signal path. graham slee is same exact circuit with only one power supply and input and output caps. Lots of open loop gain and what amounts to a class B output buffer.

I can think of lots of 70's solid state gear worth way more than $2k. This isn't in that league...

OH no... Its a ray samuels HR2 built with a single ended power supply, cap input, cap output... Massive piece of shit. DC coupled version on headwize someplace ray's is built a bit better however. http://www.raysamuelsaudio.com/products/hr-2

99% chance it works as is. That stuff was built like a tank. If its tubes it is even easier to clean up. I've seen mc75's submerged under water that when left to dry work to spec. However the chassis then was steel and that will rust, so you need to attend to that pretty quickly. If its tube stuff its definitely worth fixing. Even the solid state stuff from back then was pretty good. MC26 preamp, MC6100 power amp...

I did that with the Uberamp... Much better idea is Ethylene glycol. Then when you spring a leak, you really do have a fucking mess everywhere. Water and high voltage. Great idea... Did i mention that i'm using my extreme with an ipod and hd600's in the master bathroom. Seriously...

You ever see a singlepower product leave the factory with heatsinks??? And not the ones that one guy put on his pencil amplifier to keep it from getting so hot it was able to boil water. 60 watts of heatsink is twice what you put on a dynahi No fear, i've found a cheap transformer that fixes most of that problem.

Well it looks like you are ok as you have the real thing. Maybe even custom. So you are fine although at some point you have to deal with the overheated resistor. As far as voltron and tyson, it turns out mikhail had it exactly backwards. For low impedance loads you want more current, not more voltage. Trouble with most and probably all of those is the 500 volt power supply rail. By the time you turn up the current on the output tubes for maximum power and linearity the regulator device is dishing out 30 watts. (60 watts in voltron's case) And clearly without any kind of heatsink that big, things are going to get very warm very fast.