kevin gilmore

I wonder why the Chinese have not cloned the llmk2... maybe I will eventually publish the kx-r schematics.

by the way, its a real made by stax, stax jack. with the stax logo on the plastic on the inside. stax always refused to sell those jacks to us, we had to make our own. justin's jack are clearly superior... beats the hell out of a llmk1 or llmk2 for less than 17% of the price.

these Chinese guys are a riot. gotta love the packaging. I think this is the third thing I have gotten from china that was packed in a pampers box. Man they must be making lots of babies... http://gilmore.chem.northwestern.edu/dsc_0560.jpg http://gilmore.chem.northwestern.edu/dsc_0561.jpg http://gilmore.chem.northwestern.edu/dsc_0562.jpg absolutely standard off the shelf case you can buy on ebay all transistors on the 8 big heatsinks and the 4 small ones are 2sc4686a Q9,10,Q25,Q26 are 2sa1156 Q12,Q13,Q28,Q29 are 2sc2705 Q3,Q4,Q19,Q20 are 2sa970 R7,R8,R49,R50 are 300k 1 watt power supply pass fets are irfbe30 power supply zener drivers are 2sa1831 100% a kgss with the kgsshv output transistors.

we generally just put up a first picture of a new board. The production version has lots of small errors fixed. up to the 5th version of the off board version with servo and dual current sources already. takes too much time to update the picture every rev.

and that guy had absolutely no clue. both the wes and the electra share the same problem. the output inductor/transformer is WAY undersized to get decent voltage swing and wide frequency response. think 4 times that size for decent performance. and likely 4 times the cost. and then there are the 6sn7's craig seems to have shoved firmly up his ass. not enough voltage gain, so a tricked out input and bias circuit that is unstable. resulting in clipping and other forms of distortion.

lots of errors in that schematic http://gilmore.chem.northwestern.edu/kgsshvproductiondual.pdf the dual transistors are in parallel. you use one or the other, not both one is ebc the other is ecb hence the 4 pads updated schematic still have to add the mosfet drive option http://gilmore.chem.northwestern.edu/kgsshvproductiondualmot.pdf next version of the off board http://gilmore.chem.northwestern.edu/kgsshvampv15mini.jpg

you mean how come a commercial builder can't build an all tube electrostatic amp. Because they don't have a fucking clue, thats why. Craig got lucky with the Balancing Act, and everything after it has been a disaster. But hey, the balanced input is done right, or so he says. megatron is all tubes... and easy to build.

i may be getting old, but i don't think i ever did something for this. with the current parts you could run +/-400 but that is it. After that you have to replace the 1156 with a 1468. then the 1968 would limit maximum voltage to +/-450. Now how you are going to replace the transformer and still get it in the box is going to be tricky. Would also have to replace the power lytics with 450v parts. you may be thinking of our modification of a LLmk1 (or in fact a LLmk2) to de-liquify it and turn it back into the srm323 which is what it was based on in the first place.

amazing job kerry

you are supposed to bend all the parts in such a way as you can read what they are when they are soldered in. dale resistors, and zeners mainly.

check which zeners you have in the string. or possibly one of the zeners is dead

you mean +200 and -544. About 750 across the battery which is close to what mine runs.

always http://gilmore.chem.northwestern.edu/kgsshvpsminifinal.zip

current mini power supply board is 6.92 x 6.56 inches. low bias is just 3 resistors off of the positive regulated voltage.

just build one. take current kgsshv board and populate resistors instead of current source.

early off board versions had it, but not the servo. birgir is working on the latest board to add the other current sources

on board version already has this and had it for quite some time. some off board versions already have this

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.