kevin gilmore

I have the evidence, i just have not found it yet. I have crap stashed on at least 11 different computers. If i had some kind of organizational system it would make things easier. Next lifetime. I've asked craig in an email to clarify. Will see what he responds with. Since he is the one that builds and sells the things, it would make sense that his word would be the gold standard on this issue. I personally run 6c33's at full blast. And it warms the room in the winter. It would be possible to run the 2 filaments either in series or parallel (parallel would be prefered for this) and then run them at reduced voltage, say 8 volts. Not sure that this would be a good thing for the tubes however. This is the quote from craig's website Pretty sure that this is what he said on head-fi about it at the time.

Fine. Prove me wrong. One picture is all it takes of the bottom of the tube socket. Is serial number 38 from the second batch, or 3rd batch? Or contact craig for the correct answer when he started using both filaments. I don't know the answer i just know that the original prototype and the first batch all used one filament.

Yay team... My pictures of the zanadeux are the one with the tube sockets on the top of the chassis, so that you can't see anything. I have other pictures just can't find them. Craig will tell the truth. Problem is that mikhail does not know how to tell the truth anymore. The first person he needs to stop lying to is himself.

At 10 amps that is 1.5 volts of drop. And yes that is what it is for... A shorted filament however and flame city.

email craig for definite answer and then post here. Maybe things have changed since the early units. Its very hard to tell just by looking at the tube running whether both filaments are on or not. Or pop the chassis bottom and see which pins are wired. If all 4 pins, 1,2,6,7 are wired then both filaments are used. Even easier, turn it off, wait a while, pull one tube, use an ohmmeter and measure the socket between 1 and 6 and 1 and 7, a short will indicate both filaments used. http://gilmore.chem.northwestern.edu/6c33.pdf

Absolutely sure. C57 and C58 are 22000 uf caps rated at 25 volts. The diode bridge is bolted to the back of the panel. The 4 diodes in the middle are the high voltage supply, those diodes are rated at 1 amp each. As far as i can tell the B+ is diode bridge to 390uf cap, 50 ohm resistor to 390uf cap, 50 ohm resistor to 220uf cap 50 ohm resistor to 220uf cap.

OK, here is another one. Lets say you stuff your extreme with a pair of 6528 output tubes. A total of 10 amperes of filament power to run them. Looking at the circuit board we see that the filament supply has a full wave rectifier diode bridge going into C57, C57 is hooked to C58 with a .15 ohm 6.5 watt resistor and C58 drives the filament dc to the two output tubes. 10 amperes of current thru a .15 ohm resistor is 15 watts. More than double the rating. Which is why the circuit board is starting to burn up around the leads of that resistor. Yep, here is that new term again... acetate failure. So if you ask if there are unsafe things inside an extreme, the answer is clearly yes.

Once again earl does not know what he is talking about. source http://gilmore.chem.northwestern.edu/6c33.pdf craig has said numerous times that he only runs one of the 2 filaments to save on power and heat on the socket. So each tube is running at 3.3 amperes. craig has posted this a few times, someone else can go find the post. On to current calculations on the extreme.

I have every expectation that the one person who was sending the amp to me has been contacted by mikhail and mikhail has done a major spin job on him to prevent me from ever seeing the amp. We will see what happens. Mikhail is yet to figure out who has the circuit board unit... Maybe bluebliss can supply a few pictures...

Show me some more pictures. So far we have 2 pictures of resistors and fets running way to hot and burn damage to the circuit boards. I think hirsch's spin is now to call that an acetate failure.

here is bluebliss in action Head-Fi: Covering Headphones, Earphones and Portable Audio - View Single Post - Where is Singlepower? Where is Mikhail? and again Head-Fi: Covering Headphones, Earphones and Portable Audio - View Single Post - Where is Singlepower? Where is Mikhail? mikhail can say whatever he wants. The filament supply for the output tubes has to be rewired as a seperate circuit and referenced to B-. Everything you are describing is due to cathode leaking because Vk is significantly greater than 100 volts. 99% of intermittent performance can be traced to this major problem. The more mikhail continues to apply spin instead of fixing the problem the longer this will continue.

Once a WEEK.... OUCH. How many litres. My magnets hold for anywhere between 3 and 6 months. And my biggest magnet is 21 tesla. Whats the field on that thing, someting between 2 and 5 tesla... No wonder health care costs are so high.

R56 Dale 0507 J R57 Dale 0507 J R58 Dale 0637 J those are date codes, i'm looking for the number with typically an "F" after it. R53 I believe says 3.75W but what is the resistance... don't rotate any of the resistors if you can't read them. If you have an ohmmeter you could measure them r4,r104 is the color code yellow, purple, orange... very hard to tell from the picture as the camera probably skewed everything to green.

No... I never said that you said that. It is just that i'm working from pictures that people send me. If i was going to be consistently more accurate drawing schematics from units than i am now from pictures i would have to actually have the real thing to look at. That means someone would either have to send me a unit, or i would have to buy one. The chances of me actually purchasing a unit from mikhail is zero. It took me 3 tries to get the singlepower squarewave circuit exactly right... For example. If i make a mistake and someone points it out, then i will admit to the mistake. OK, the power fet on the extreme was a mistake. The cathode sitting at -350 volts on every single ES1 and ES2 is not a mistake.

lets see C51 and C?? 390uf 400v C52,C53 200uf 220v or is it 220uf 200v R54 .15 ohm 5 watt R50,R51,R52 50 ohm 5 watt C56,C57 22000uf 25v filament cap C4,C104 470uf 250v output capacitor R4,R104 47K ???? R10 2102 == 21k C1,C101 cathode capacitor r106,R107,R108,R109,R6,R7,R8,R9 250 ohm 5 watt R5,R105 ?? R56 ?? R57 ?? R58 ?? R53 ?? R1,R101 1004 == 1M R55 ?? How am i doing ??

values on all the resistors and electrolytic caps would be very handy in drawing up a complete schematic. And the voltage ratings on the caps. Getting a good picture of the bottom of the board thru the top of the board is quite tricky, and you typically need a very good camera and a ring flash. But in general, close the lens down as much as possible, and crank the flash as much as possible. Then a slight angle and the bottom of the board shows up. Put the camera on a tripod, and make sure the focus is perfect. Also shining a light under the board, and photographing from the top at high sensitivity usually works... Now that i have the time to stare at it a while i really think all 4 resistors are in series, so that it is probably 1k ohm, and there is probably 100 volts across those resistors, making for a total of 10 watts which is 2.5 watts per resistor, and if they are the same as the other resistors of that type they are rated at 5 watts each. See this is why good pictures are so important

Well if people would send me better high res pictures and tell me what they are pictures of, i would make less mistakes. If you think i'm going to ever buy any mikhail crap, you gotta be kidding. As far as the extreme pictured above, better pictures are needed from a couple different angles, taken with as much flash power as possible to see thru to the other side. With a better side shot, its easier to determine the resistor power, but sure looks like 5 watts each. Maybe only 3 watts each. And i definitely like the acetate changing color around R54... But here is my best guess. The output resistor to ground is 2 x 250 ohm in series. 500 ohms... REALLY... The zanadeux uses a 330 ohm resistor. The other 2 resistors probably also in series are probably in the plate to lower some of the tube output power. And you bet the thing runs stinkin hot. So depending on what the value of b+ is (something in the 150 to 200 range) the cathode resistor has 50 volts across it. So about 5 watts. And i definitely like the acetate changing color around R54

We now recycle 95% of our helium. It still is not cheap. The 50kpsi pump that makes the helium gets a new piston and seals every 8 weeks. Pain in the fucking ass. I very much doubt that the wide mouth dewar can withstand liquid helium temperatures. One of these days i will try. Yes that was a bob dylan sacd. Don't remember what the other 2 were, but i think they were also sacd's. They survived just fine (only listened to them a few seconds) One of the plastic cases however had a crack in it, and it turns out that plastic baggies evidently don't like liquid N2 they get and stay ultra brittle.

Here is how i do it. The controller can do .25 degree C per minute up or down http://gilmore.chem.northwestern.edu/jordan1.jpg and the stuff i did for the guy over there http://gilmore.chem.northwestern.edu/jordan2.jpg Now you got me interested in the power tubes thing again. So i'm going to accumulate a batch of el34's i don't care about and do it again. Although i'm going to stick them into an electrostatic amp, so its not really the same thing. The power tubes you did the experiment with could have been absolute crap...

Way better build quality than that other mod company. Should last as long as the player.

What you need to do now, is burn in the cryo'd tubes for say 10 hours, then put them aside for a day. Then listen again and see if you can hear the differences. In my tests, the cryo'd tubes return to normal (pre cryo) after a day or two of use.

I finished cryo treating a bunch of stuff for a guy over on head-fi. I expect his reports in the next few weeks. 1 day to cool down, 7 days in Liquid N2, 1 day to warm up.

quoting a complete and utter moron by the name of HeaphoneAddict I am just guessing, but if there is a baseline with the positive part of the signal above that and the negative below that - what if he further divides the positive phase into two by the part going up and the part heading back down, and does the same with the negative signal. That divides the right and left channel each into 4 segments = 8 Could that be it? look what happens when complete marketing bullshit is explained by a completely clueless jackass.

joe jackson 1982

Do tell. In a very long winded markl like manner... Don't forget about at least 4 pages on the power cord alone.