kevin gilmore

i put the headphones in the box that had all the original desicant... Maybe overnight it will get better, but i doubt it. A lot of people did hear the O2 till about 3pm when it happened... since i was not in the room at the time, i really do not know what happened, maybe someone spilled some water from a glass and did not have the balls to say something. But there was water and moisture on the inside left earpiece. New rule, no liquids near electrostatics. But really i do not know what actually happened. In a week i will know for sure. Going to try ebay and see what is available. Can't work on the kgsshv without my reference headphones.

I figured out i would say something about the heat on the T2 and the knob. The amp is happy to run all day long, and as many of you have found out, it gets rather hot. My stupid idea of machining a one piece volume knob with a shaft that goes thru the panel with a panel bearing causes the knob to get as hot as the rest of the thing. Not a problem at home as i have it hooked up to the krell preamp, and control the volume that way, so i don't have to touch the knob. But at CJ, i did not bring a preamp, and really none is needed, but to control the volume you have to use the knob... I'll be making the knobs a different way in the future. I won't even discuss what someone did to my O2's... Seriously pissed on this, Jim says i should make an insurance claim. Alex cavalli spent about 30 minutes listening to it, and said he really liked it, but thought that few were capable of building the thing.

plenty of booze in my room, stop by till about 5pm when setting up starts... See the T2 before its plugged in. room 518 and this just in... http://gilmore.chem.northwestern.edu/beely.jpg

Its still at work. Trunk full of various CJ stuff... If i go in to work on monday (depends on amount of booze on fri,sat,sun) i'll take it home. Otherwise tuesday. Each piece is wrapped so nice. The heatsinks polished up the best. Actually the front and back polished up the best. NO wait... And besides, taking pictures of black stuff is a pain. its definitely BLACK.

Got the chassis. Its pretty damm good. Not quite justin good, because i went for a less shinny finish, but i'm VERY happy with it. I'm pretty sure spritzer is getting the first one

silly british boys thinking they can plug those things into american power... Go to radio shack real quick and get a universal adapter, i have some somewhere, but don't have the time to find them.

No knobs yet, titanium or otherwise (except my unit) other than that, a complete chassis. Was thinking of also doing a knob with 3 machine rings to put o-rings onto. polished then black anodized. i may do some custom machined spikes, but that is also for later.

So i just got the email that the first chassis is done, and i should have it tomorrow. So the first person that wants it, gets it, but due to CJ i won't be able to ship till tuesday. Don't have the invoice yet, but they said something like $300 for finishing. So its $987 plus about $300 plus shipping plus 3% paypal... (plus $160 for the board set if you don't have it yet) 8 more sets of tops and bottoms done, need to finish up the fronts and backs.

12 volt SLA battery. Works great. The 7ah battery will run it for about 18 hours.

Getting rid of Yamas is a really good thing. Incompetent morons. I recently saw the work they did (and charged $2k for) to try and repair a T2. Someone serious should pick up the dealership.

Hand wiring takes too much time...

If you do it with this case, there is plenty of room for everything and you can lay the transformer down. Its 3.5 inches in diameter and about 2 inches high, so on the power supply board that is 8.65 inches long there is plenty of room for the transformer.

What i ment to say for the T2 like dynamic amp, was BALANCED OUTPUT only. It would still be balanced or unbalanced input. The thing is that the servo will make both sides of the output zero volts, but with respect to ground it may still be 1 volt or more. (same as the nelson pass things)

SEE it goes like this.... The higher the power supply voltages (everything else staying the same) the faster the slew rates. The word OVERKILL does not seem to be in my vocabulary. It would take me a while to find it, but i think ti kan said the B22 did something like 75 volts per microsecond. I'm not sure i believe that, but then an electrostatic amp should be able to do 10 times that. Or 750 volts per microsecond. A non-trivial task for sure. Last nutty idea for this year... Anyone interested in a dynamic version of the T2 with 6as7's as output tubes?? Sort of a re-do of my original MIG amp, except completely circuit board based, with + and - 75 volt power supplies... Balanced ONLY. Although one of these days i'm going to do a DC coupled circlotron...

That is going to be a bit of a problem with the neutrik jacks... They are designed for 6.35 mm. Might fit anyway but they are going to bend a bit.

This will likely go down the same way as the T2, except i'm not doing chassis this time. (well except for me) So in a month or two after i have all 3 pots, and have measured 5 times or more to make sure everything will fit, then i will do a board run. Say 20 pieces of each. The boards are much cheaper than the T2 so its no big deal if it takes me a couple of months to get rid of them all...

added the tkd pot. adding the alps pot might be a bit tricky. Since they are on extenders like the T2, you can put it into any chassis you want. http://gilmore.chem.northwestern.edu/kgsshvamp.jpg first cut at power supply schematic http://gilmore.chem.northwestern.edu/kgsshvpower.pdf and bom (missing among other things the xlr jacks) but close http://gilmore.chem.northwestern.edu/kgsshvbom.xlsx The power supply costs more than the amplifier. (which is usually the case for high end stuff) You can certainly go cheaper and unregulated i you want... Board pair estimate about $50 (1 each stereo balanced amp board, and 1 power supply board)

Need the layout diagrams for any/all pots...

first cut at the schematic http://gilmore.chem.northwestern.edu/kgsshv.pdf The boards definitely will fit together in one chassis http://gilmore.chem.northwestern.edu/kgsshvamp.jpg http://gilmore.chem.northwestern.edu/kgsshvps.jpg depending on the thickness of the transformer which will mount to the back panel i'm pretty sure that if you do it as one box, it sends up 14 across by 11 deep with 1 inch between the 2 boards. I might have to make it a bit longer to accomidate the transformer.

Yes you can certainly change the part values and add the current sources as outboard devices on justin's board. In fact that is exactly what my prototype is. Power supply is obviously different. The pot i was talking about was the input pot. Something that is available. Like the rk25, or some such, because evidently the rk50 is soon to be discontinued. Starting on the schematic now.

The heatsinks are the rest of the heatsinks for the T2's. All gone. Because this thing is going to be less than 12 inches, standard heatsinks should be available, and without all the extra machining...

2 boxes it is http://gilmore.chem.northwestern.edu/kgsshvamp.jpg board is 11.0 x 6.975 inches designed to fit in a box 11.2 x 7.0 inches inside with .25 thick front and rear panels. i have the dact in there as the pot because the rk50 would cost more than the rest of it combined. power supply hopefully the same exact size. What other pot should i add... I have actually cleaned up the house a serious amount... All i have left is 30 of the heatsinks. Soon i will be taking those to work. All the T2 chassis parts will be packaged and leave from work. So no more 600+ lbs of aluminum stashed everywhere. You can swap out the parts on your KGSS to turn it into the high voltage version. You can leave the resistors at the top of the 3rd stage, or build the current sources on addin boards... The original kgss design is TEN years old... maybe a bit more.

No way CJ preview. No box for the amp. NO BOX FOR THE POWER SUPPLY. 1 killovolt flying around with enough energy storage to kill. Sort of like the BHSE prototype i have, only much more dangerous. I'm not going to even supply pictures because i do not want to encourage this kind of behaviour. The company supplying insurance for the meet would probably go non-linear. Overengineered? I would never do such a thing. Headphone amps are supposed to weigh at least 50 lbs right?

So krell style matched pair with heatsink on the left side for the amp, and on the right side for the power supply ??

So for whatever reason a number of different projects are coming together at the same time. This is the latest. http://gilmore.chem.northwestern.edu/kgsshv.jpg Its the high voltage version of the kgss with higher voltage pnp transistors, a cascode current source for the 3rd stage, the lsk389 part (or singles) and much higher voltage output transistors. The result is something that runs on +/-500 volt power supplies, and is as close as i know how to do to the T2. (except fully solid state, and easy to build) The transistors that go on the heatsinks are already insulated, which makes that part easy. Not a lot more money than an exstata, and much better sound. So do i make it a single box, Do i make it a two box affair with the power supply in a seperate box... What are people interested in??