kevin gilmore

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.

OK, so a picture of the insides of guzziguys amp would help. Reason is that the one of the two companies probably used has different wiring colors on the transformer wires. Pictures of the area around the transformer. Also looking for transformer wires not used (like the 5v ct winding on the hammonds) I'm working with someone that is trying to fix tyson's amplifier right now. You betcha, mikhail fail all over the place. The B+ on that thing with 6bl7's is 500 volts. At 30ma. Into a 25 ohm load it puts out only 2.5 milliwatts before clipping. By the way, on that unit the output caps are running 50 volts over spec. On voltron's amp the spec on the output caps is 160 volts (pretty sure on this one) which means he should never EVER go more than 2 x 75 volt gas tubes (well 4 total). I'm pretty serious about this one. Otherwise the posibility of expensive headphones going poof...

I've just looked thru all the plitron standard product and there is no standard part that comes even close to the required power and voltage requirements. So if it really is a plitron, it would have to be a custom thing. Something like 120vac output at .5 amp, and 6.3vac at 10 amps.

You just think that it is a plitron transformer because you have been told it is. Given the events of the recent couple of months, how do you really know unless you pop the cover and look. plitron transformers, every one i have ever seen going way back are all toroids and won't fit into the square box. So if you still have the 4 inch x 4 inch square box there is no way a plitron toroid is going to fit in there. If you have the round cover then there is a good chance you really have the right transformer. Then there is the issue of what particular model number it is. Here is a big hint. Nothing mikhail has ever done that i have seen so far has custom transformers, everything is a stock model. His line that he had the transformers custom made is pure bullshit. If the transformer runs so hot that you can't touch it after it has been on for an hour, it is likely that sooner or later the transformer will let go. When that happens a custom transformer is about $107. But then it ends up looking like mine does now instead of what it used to look like.

My personal amp is a ppx3 extreme. Back then mikhail built about 50 mpx3's and ppx3's and was unable to sell them. So he tore them apart and rebuilt them as extremes. Including the completely underpowered transformer. There are only 3 different chassis sizes, and 2 different circuits total. Plus all the custom stupidity. (dynamic amps only) My tube power supply design was such that it used existing tube socket holes, and did not require any chassis work. I can certainly build all tube power supplies that regulate to a fraction of a volt. Basically copies of the old tektronix stuff. Requires very custom transformers with lots of isolated taps. Would not fit in that box.