kevin gilmore

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.

something like this http://www.mouser.com/ProductDetail/MEDER-electronic/SIL12-1A72-71D/?qs=6LkQJpCWFTifeu4Ctb4tFgDRzs7G8uTK would work on a 12 volt power supply line with a delay.

cheap ceramic discs. Not wimas.

510 ohms in series with .01uf disc cap across the relay contacts.

100 bonus points for the best one liner in a long time.

correct, and you will need 2 of them and they have to be 1kv rated reed relays. Anything else sparks pretty nasty.

This transformer stuff makes no sense and is really pissing me off. The DC current to the amplifier (both channels) is 45ma 70ma AC absolutely should be enough. None of my prototype transformers have ever blown, and some are 3+ years old with lots and lots of use including accidentally being left on for a week. The testing i did for justin's bhse transformer was a 150% overload for 3 days, no problem. Maybe time to find someone to make some R core transformers for us because those are linear windings, not subject to kinks or other issues with winding a torroid.

1) Depends on whether one side of your mains is grounded or not. But generally it is a good idea to have a dual pole switch because that is the world standard. Its all about safety.

Have a happy high calorie birthday