kevin gilmore

2sa1968 is a 900v part. the ixys part is a 1kv part.

this is just the angle brackets, and for the boards that are 16 inches long. lil-knight has a board layout that is 15.65 inches long that fits his chassis. so the brackets I will be making are for the 16 inch board. will see about the other version later. so far 4 sets are spoken for.

A few people have asked about the angle brackets. But I don't have any more. But the don needs some. So I will make some more. If anyone is interested let me know. Probably going to be about $140 for the set of 4 given what the price was, and what the new hourly rate for the machine is. Plus shipping. Will get an exact price on Monday. These will be for the original boards, not the shrunk one I did for lil-knight.

there are alternate versions of the pots with the adjust on the other side. So you could use a PLASTIC adjustment tool on those... without the servo the output voltage changes 7 volts going from 5 to 10ma with the servo, it should work if adjusted carefully

for the onboard heatsink version we could do something like this with a set of jumpers. But you will have to re-zero after moving the jumpers, and considering they would be at -Vcc, any kind of external switch of relay would be a very bad idea. Mikhail comes to mind with his arcing high voltage switch option.

its krell. it is supposed to run hot. touch a fpb600 after its been on for a while.

when tom's real ksa5 suffered damage due to a stupidass company making a stupidass and incorrectly wired power supply cable and the + and - voltages were flipped, the total of the damage was 2 bad resistors and one transistor. Circuit is highly resistant to abuse.

its a b24 with lower power. not surprising that it sounds like liquid poo with the poorly driven mosfet output stage. which looses about 8 volts from the drive stage. alex needs to study up on how nelson pass does stuff like this. and stop with the crap irf parts and use the semetec lateral mosfets.

needs to be a mylar cap. so the 1uf/1000v cap works and fits fine and is cheap. But really you need a 30v cap. next to the 2sa1486 are stn9360. use one or the other, not both. stn9360 is surface mount.

birgir and I have ordered 300 pieces of the new Motorola part. We expect that this part is going to be much better sounding than the ixys parts for the gain and output stage. 2sa1968 still more temperature stable than the ixys part and always will be. Also hopefully we have ordered significant quantity of 1200 volt bipolar.

have to use a different opamp, and probably have to adjust a few resistors. probably can get away with +/-30 but that is it.

really, is that so... balanced version more than sufficient to fry your ears on he6

5 watts rms into 8 ohms is the spec.

I owned a pair of acoustat's for a number of years. Messing with that amp definitely no fun. build a megatron with 3-500z and + and - 2500v power supplies. and appropriate rated interstage coupling cap. not going to be cheap. but will be glorious. since they have to be monoblocks anyway, it won't be that huge. Don't do this unless you really know what you are doing.

mine are right against the heatsink too. works fine.

I'm sure the 2n5565 will work. Some people are using lsk389

with servo version http://gilmore.chem.northwestern.edu/kgsshvmv3.jpg

and that schematic is both incomplete and wrong

you can be sure that a version of this board will be available. I think I have figured out how to cram the servo in there.

you bet its a turd. But its only $79.99 For that price it still beats the crap out of anything 20 times that much money. The real klone sounds a fair amount better. And that is what I get for releasing the schematics and making it easy to copy. I wonder if I release the liquid gold schematics if they would do the same thing

looks like the same pins as the teflon sockets, so if that is what you got it should be ok for both sockets

and I do not think they will fit the board. Maybe the 8 pin sockets can be made to fit, but not the 9 pin.

mjf parts do not need heatsinking

I use the thermasil ones. you use insulators to get good thermal transfer. The heatsinks are isolated from everything, so you don't even need insulators, but if you use thermasil or other conforming ones you get better thermal transfer. Even if there is a short between the case of the transistor and the heatsink its ok, as long as you don't touch the heatsink I'm pretty sure this is the one I used mouser part number 567-175-6-310P

same thing, just a voltage protector.