kevin gilmore

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.

schematic has not changed in forever http://gilmore.chem.northwestern.edu/t2schem.pdf

i used .125 inch material. which is standard in the usa. thicker should work if you machine a bit more off the transistor edge.

dalbani guaranteed to be the fakes that birgir and I returned. 2sa1486 works, just flip it around. stn9360 works if you make (or someone makes) the little adapter board

One of the members of our work team retired early. And I completely understand why. So if I had any free time left, which I already did not, I certainly do not now. Plus if I use my preferred vendor I pay Illinois sales tax. Its stupid for me to have boards made.

if its just one channel, likely a noisy input that340. if its both channels, you can reduce the overall gain.

the power supplies definitely have different noise spectral densities. whether they actually sound different is very hard to tell. The one with the TO3 transistors has better voltage regulation.