kevin gilmore

the whole archive is 20GB and is a real mess, lots of cleanup needed, so many different version etc. here is the one you asked for. goldenreference.PDF if anyone needs other pdf's and know the name, I can add here

the feedback mod is only for 727

was about to sell this piece of shit, final test and the dac board is no longer recognized. first $150 gets it. condition: guaranteed to be fucked to the schiit

I can definitely do a I/V converter with a discrete cfa amplifier with the current input directly feeding the emitters of a complementary input stge.

does not really matter as long as they are matched

here is the unbal/bal to bal board diffinput3.PDF

you could do a really nice tube output stage with 6c33. But you need 4 of them for balanced. Output impedance of 30 ohms. But that is way past goofy, at least 200 watts power consumption by the time you are done. And its huge. Or 10 tubes in parallel (40 tubes total) like the big Conrad Johnson preamp which also gets you under 50 ohms. The Conrad Johnson thing has the benefit of very low noise. you could do transformers and use the patent from audio precision to bias the transformer in such a way as to completely remove all second harmonics, you would be surprised at the amount of distortion that even the best low level transformers have. my favorite is a pure class A output stage.

The nt503 uses the ak velvet sound chips for both dsd and Pcm also converts pcm to 2x dsd as far as I know there were no specs published on the new soekris dac

I will be buying one as soon as they are available. can't touch the price/performance also for non r2r the teac nt503 continues to be amszing

if by rudi you mean rudistor, then no way. that moron could not come up with something like this. state of the art with the balanced input going unbalanced thru the transformer then 6cg7 in circlotron mode ac coupled in and (hard to tell) transformer output. massively fucked crap.

r2r chips that are 24 bit seem impossible to make, or not enough demand yet to develop them. soekris,totaldac,msb,holo,denafrips etc all use the same lvc595 for the switches, and all are exactly the same idea. but the new soekris is the only one yet with a discrete class A output stage. And a rational price.

I think the cascaded fets instead of the 2 x pnp and resistors etc is the easiest to increase the performance.

so i have a big problem with the morons that charge stupid money to add a tube buffer to a solid state output stage. modwright instruments, and lampizator for example. you start with something that has a 200 ohm output impedance, and by the time you are done with the cathode follower, its a 1.5 k output impedance, or in the case of the lampizator something like a 3k or more output impedance. its stupid and counterproductive. but hey there are these glowing things sticking out the top. you can't make a decent i/v converter with tubes without 6 triodes per channel. and even then, solid state is far better. r2r is a voltage output anyway, not a current output

dac1541 is going to be the giant killer. r2r,sign/magnitude, fully balanced, and dsd for a price that is less than half of a yggy

that would be the krell. one of the few pieces i don't move to vacuum under or around. requires 3 people because the platform is stuck to the underlying plywood same thing with the wilsons

well obviously they know how to make pretty front and back panels. making circuit boards would have been easy. I would never touch that piece of shit. Nik's was much more poorly built. And I would be more than happy to say to your face directly anything I would say here. And so would birgir. after he squashed you into the ground.

definitely the t8000 is dc coupled. but it has a servo, so the frequency response low limit is .1hz

twice the impedance at 10k than a cascade current source alone, 20 times better than the t2 current source but by specs, only good to about 930 volts

I will synthesize that and get back to you

you can't, that is the problem. there are other depletion mode ixys parts with 1kv or more, but they are not sharp cutoff and have more capacitance so you have to cascade them.

not enough voltmeters

also notice the same rms voltage as 727 which means +/-350 power supplies

my guess is a single dual triode as the differential amplifier, probably a pnp cascode, pnp current source driving a npn only way to keep it all dc and still get the plate voltage down to something manageable

looking at the pictures, small surface mount transistors on a board that is insulated from the heatsink. so pretty much the couple of pnp and npn surface mount parts that are available plus a tube front end that emulates the t2 with a lot less parts price seems grossly high for that

T2 was the only stax with a servo. both common mode and differential mode. 717 had protection relay circuit if dc was out of spec