kevin gilmore

well if you already start on the floor you have less far to fall when you get knocked on your ass if you make the mistake of touching any of the high voltage wires

shrunk kgsshv power supply board available to anyone that wants them, but lil-knight has them so boards will be available from him.

http://gilmore.chem.northwestern.edu/knobs2.jpg http://gilmore.chem.northwestern.edu/knobs3.jpg finished Arizona desert ironwood knob and Hawaii burl red mallee blank with interesting voids

if its the original version of the power supply board, take out the current limit transistors on the power supply board for both the positive and negative supplies.

Well he did do the Liquid Lightning. More correctly he ripped off the stax srm323 and used mosfets for the output stage. But alex will say that all circuits look the same after a while. I doubt the Liquid Glass is that complicated. Alex calls it a mu gain stage. completely open loop. capacitor coupled to a mosfet output buffer. a single tube with a pair of triodes per channel. no matter how hard you try to match the two tubes you get channel gain differences. I'm sure the liquid gold schematics will show up eventually. People will be in shock and awe of its greatness.

Mikhail did star grounds like that!

actually you forgot that ray also owns a GTR and he is in the process of buying a new ferarri F12 evidently they are not easy to purchase even if you do have the money.

how much feedback? Generally the more feedback the more transient intermodulation distortion. There is always group delay. 10 to 15 db of feedback is a good thing. 30 to 40 db of feedback is usually a bad thing.

From the cavalli web page and stuff cavalli has said maximum power 9 watts into 50 ohms absolutely every solid state otl amplifier I know of with a reasonable power supply increases its output power as the load impedance decreases. which means that it should deliver more power into 32 ohms than it does at 50 ohms. yet this amplifier and the liquid fire both deliver less power into 32 ohms than they do at 50 ohms because of the power supply. furthermore alex has said that the liquid gold uses standard + and - 15 volt power supply rails and that the amplifier has mosfet output transistors. This would imply that the amplifier has a rail to rail output voltage. No mosfet that i'm aware of except for highly non-linear low voltage mosfets for power switching applications are capable of this. So the 9 watts is highly optimistic. One of the highest power headphones amps. Really?? Even a single ended dynahi has more power and more class A power, a balanced dynahi has 4 times the output power, the GSX mk2 with the 20 volt power supply rails has more power, rays piece of shit darkstar has 80 volt rails and stupid amounts of power etc. Fully balanced and differential ?? If that is the case, why is there a drv134 in there to convert single ended to balanced? super symmetry dynahi does that all by itself. Schiit mjolnir also does that all by itself. No single ended to balanced converter needed. Pure class A output for the first 550mw... Seriously... The first dynahi's were 18 watts of pure class A. The current GSX are 4 watts of class A (or something like that) The krell ksa5 klone is 5 watts of pure class A The new singlepower squarewave clone is adjustable from 2 watts of pure class A to 3 watts of pure class A (single ended) THD of .0015% @ 3 watts into 32 ohms. how about 9 watts into 50 ohms. And how much feedback is there, what is the intermodulation distortion, because with a thd that low, there has to be oodles of feedback. From the looks of it, its definitely a nice chassis. So I ask... http://www.youtube.com/watch?v=AwbyH9THoQo

original power supply version of the krell ksa5 power supply also suitable with lower voltages for the singlepower squarewave the later version coming shortly http://gilmore.chem.northwestern.edu/ksa5psorig.jpg http://gilmore.chem.northwestern.edu/ksa5psorig.zip and here is the alternate version of the krell ksa5 power supply http://gilmore.chem.northwestern.edu/ksa5psg.jpg http://gilmore.chem.northwestern.edu/ksa5psg.zip

All are current production mouser parts. mje210 863-mje210g 1 0.49 0.49 mje200 863-mj3200g 1 0.54 0.54 2n5210 512-2n5210ta 3 0.21 0.63 2n5087 863-2n5087g 2 0.13 0.26 2n4393 610-2n4393 2 2.69 5.38 opa134 595-opa134pa 1 2.94 2.94 1n914 512-1n914 2 0.1 0.2 heatsink 513202B02500G (newark) 2 1.67 3.34 dip8 socket 571-2-1571552-2 1 0.81 0.81 2 pin terminal 651-1729128 2 0.82 1.64 3 pin terminal 651-1729131 1 1.21 1.21 .1uf 100v ls=5mm 80-R82EC3100DQ70J 4 0.32 1.28 4.7uf 63v wima 505-MKS24.7/63/5 2 4.33 8.66 22pf ls 3mm 598-CD5EC220JO3F 1 1.79 1.79 10 ohm 71-rn60d-f-10 2 0.11 0.22 49.9 ohm 71-rn60d-f-49.9 1 0.11 0.11 100 ohm 71-rn60d-f-100 2 0.11 0.22 200 ohm 71-rn60d-f-200 1 0.11 0.11 221 ohm 71-rn60d-f-221 1 0.11 0.11 332 ohm 71-rn60d-f-332 2 0.11 0.22 10k 71-rn60d-f-1.0k 4 0.11 0.44 34.8k 71-rn60d-f-34.8k 1 0.11 0.11 75k 71-rn60d-f-75k 1 0.11 0.11 1M 71-rn60d-f-1M 2 0.11 0.22 50k pot 652-3299w-1-503lf 1 3.25 3.25 34.29 per channel not including the circuit board (should be about $5 each if we make 100) plus power supply, chassis, pot... cheapest thing the stax mafia have done to date.

if you are building the older version with a lower voltage opamp and the regulators for it, there are weird lock up issues with the regulators that cause the opamp to do whacky things.

and since the krell ksa5 klone is wrapping up... this should be final version http://gilmore.chem.northwestern.edu/squarewave.jpg as usual with all singlepower stuff, the sound was very right, and the implementation was very wrong. well this fixes all of that, adjustable bias, heatsinks for the transistors, and a dc servo, and otherwise just about as simple as possible. Just kickass for hd800 3.1 x 3.1 inches Arizona desert ironwood knobs coming out absolutely gorgeous. harder than ebony. and a lot less trouble.

Make sure that is really a 10k resistor feeding the led

I've built a couple of those, they are known to work.

don't do that. go to radio shack if you have to. white led's are 3.8 volts

pull the opamp make sure that both 10k pots in parallel with the 500 ohm resistors are set at max resistance. just noticed that one of them is going to be full ccw and the other is going to be full cw. make sure the other 2 10k pots are set in the exact middle. or start by not populating any of the 4 pots.

Shorted 1815 or open led or led in backwards.

if the outputs are at +VCC then probably Q20 is shorted. or the led is toast. Need to know the voltages at the top of D11 and D12

gerbers were posted on page 5

those look real in every way. And kerry, that's a great job.

http://gilmore.chem.northwestern.edu/ksa5klone.jpg the fat version of the pot fits perfectly. I figure about 5 hours of build time total if I had all the parts ready to go without having to start and stop waiting for multiple orders.

Inu, nice use of Teflon tubing to get all the small transistors exactly the same height.

my guess is that the output transistors and the 2 ohm resistors are toast.