kevin gilmore

I don't think it will. might be interesting to find out, but I have enough cheap meters, don't need another one. if you have 50 feet or more of cable you want to test you can drive it with a square wave 20khz or more, put a scope at the other end, put a pot at that end, and adjust for best looking wave. Then measure the value of the pot

sr-003 are the in ears with the standard pro-bias plug

only the input transistors are jfets. Everything else is bipolar unless you use the ixys parts which are depletion mode mosfets.

I'm sure the power supply is good, but you had better double check all the rewired transistors. Something very wrong, and I know that board works

very nice, like the color

the only amplifiers I know of that are absolutely flat THD vs frequency are CFA's. No way to build an electrostatic amplifier that way. my equipment is much older than justins gear, and the T2 when measured the same way that stax measures it comes out better than .01% No way am I shipping my T2 to Justin to have him measure it with his pile of late model Tektronix stuff. people over there lacking a clue do not understand that an electrostatic amp with a minimum gain of 54 db (eddie current) and a typical gain of 56 or 60db is going to have to perform differently than an amp with a gain of 6db.

high compared to what? stax amps are rated at .01% at 1khz. eddie current electra is between 1 and 2 % same thing with the wes if you really want .000000001% thd, you have to buy a LL

that is what the megatron is. All tubes. does keep the room warm in winter.

actually we should rename this thread KGITSOCH because this input section is virtually the kx-r with a few mods that make it even lower distortion, lower noise, and faster. No feedback of any kind. Should be doing a test run of boards very soon http://gilmore.chem.northwestern.edu/ubaltobal2.jpg

the heatsinks on the regulator transistors limit the energy to about 2 watts each. So what they do is limit the pre-reg voltage, on my line voltage, its about 380v not a lot of headroom. this is one of the many differences between this thing built well, but on a limited parts budget, and the massive overkill we typically do.

I'm pretty sure the transformer I have says 230v primary, will look tonight.

latest version http://gilmore.chem.northwestern.edu/kgsshvampv16mini.jpg

the pot says Taiwan on it and has a logo. I took a picture, but its fuzzy and I have to do it again. goes and looks up alps logo. yep its the alps logo

So my opinion of the sound of this thing is that it is very good indeed. Sounds a lot like a kgsshv due to the output transistors, but nowhere near as much voltage swing, and that limits the dynamics a bit. The pot is definitely very cheap, but does seem to work ok. You certainly could un-wire it, and put a decent pot directly on the front panel. I need to spend more time with this, but kind of busy till friday

that side of the cap is still ground. no way to do a thermal for pin 3 due to nearby wires

the original and my klone use all small pnp mps8599 all small npn mps8099

the Chinese krell copy while really good for the money is not exactly the same as the original. The power supply is only one set of regulators, not 2, there is a whole bunch less capacitance on the amp board, and they did change the servo slightly. Most people are not going to notice the difference.

the kgss is a single primary winding. It would need a different transformer. or maybe the company sells it with a 110v transformer

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.