kevin gilmore

the headphones cannot possibly know whether they are hooked up to a balanced or unbalanced amplifier. Maybe if you want to get fancy and add some extra weight you can use wire with a shield on it and wire the shield to either xlr ground (4 pin) or the 5th wire (5 pin)

all tube supersymmetry electrostatic amp with dc output servo http://gilmore.chem....du/electra3.pdf and the one cap one transformer cascode version http://gilmore.chem.northwestern.edu/electra4.pdf

i figured i would toss these two out for your entertainment http://gilmore.chem....edu/electra.pdf http://gilmore.chem....du/electra2.pdf obviously you have to add adjustable bias for the output tubes.

andy fresh roasts coffee. Then ships me some. Very yummy. Highly addictive.

But the amplifier part is in fact completely dual mono. Was from the start. 2 completely seperate power supply umbilicals. Just in case someone wanted to make dual power supplies. see... i think ahead.

in and done

dual mono for the win. 2 amplifer boards 2 power supply boards 2 transformers monster sized box(s)

yes they replaced them. And charged us double.

2.1v - vbe junction (.7) /180 ohms == 7ma. But the led's actually are more like 1.7 volts due to the drive current. So its about 5.5ma. You can change to a higher voltage led, but the red led's thermally match the output transistors. So you want to cut the 180 ohm resistors to something like 150 or 120 ohms.

or decrease the emitter resistors.

Its the output stage current you want to bump up. You can bump up the 3rd stage a bit, but no reason to go crazy on that one.

retro, i like it. Probably too tough to put the tubes in the same place as the st70.

Done

regular white goo for me. none of that stuff with the silver in it.

Such a simple thing, such a global effect

just think of all the extra picofarads of capacitance the horror, the horror

A person trying to buld a BH is having trouble, because the 2sk389's from ebay are actually npn transistors. It works, but low input impedance. LSK389 are available and should be the only thing you use if you need those. No p-channel fets yet.

waiting on kerry for any final changes to the multiamp board. preamp board is finished.

but it does not cover them very tight. The correct box end wrench should be able to loosen the bolts. But it would take a while. If the bolts are on very tight, it could be a real bear.

Its probably about 2 years ago, but it was on the news. Some person people called a vigilante in new york was going around and removing the boots on booted cars. Without anyone asking, evidently just for fun. Did a couple hundred cars. I don't think he was ever caught. But at about $2k per boot, he ended up costing the city plenty. You can now buy a gasoline powered hand held corrundum bladed saw at home depot for less than $200. The thing is that people who don't know try to attack the lock mechanism, which is highly protected. Cutting the pins with the saw is evidently fast and easy. Wear eye protection, the sparks that fly are probably kind of nasty. I don't think that any of those boots would fit on the monster wheels of my corvette. But i don't park anywhere where i could run into this problem. The last parking ticket i got was at least 25 years ago. A couple of people that had their cars damaged by attempts to boot them evidently sued the citys involved and won. lasers big enough to do this are not portable devices. I would think a portable oxy cutting torch would do it, but may have other problems.

absolutely there is. I've seen it done a few times. There was a guy in new york that had a gasoline powered ceramics saw that would rip thru one of those things in about 30 seconds, leaving no damage to the tire or the rim.

measuring the electrical impedance is going to be a major bear. currents are super tiny and the voltages are electronics killers. The best thing could be to make a coil of 100 turns of wire, and put one of the drive wires thru it. Then a voltage attenuator, and a 2 channel sampling device.

Any amp that ipodpj is going to have is probably not Going to like driving balanced and unbalanced at The same time. Bound to cause additional trouble.

stax definitely did not use reed relays. since i don't have one open at the moment i can't pick the exact part they used. But they also used lower voltages too, so if you were to use the stax relay at 450 vac, it might not behave so nice. I use those sealed reed relays at work up to and including about 15kv. (well different models, but the same thing) switching AC and switching DC. work great.

quote by a complete and utter idiot What the fuck does running one balanced, and the other single ended have anything to do with anything, except possibly getting the phase backwards on the hd800's which should cause all sorts of additional problems. And the bit about requiring magic cables is also quite entertaining.