Pars

Percy Audio is the only place I know of that sells these. I've never used one.

From amb.org: Please note that in the 3-channel "active ground" configuration, some part values in the ground channel differ from that of the left and right channels. See the following table: Part Left & Right channels Ground channel R1 475Ω (not used) R2 1MΩ 1KΩ R3 (see table below) 2.49KΩ R4 (see table below) 2.49KΩ C2-C5 (see table below) 100pF The following table shows the left and right channel part values when building the β22 with a non-default voltage gain (gain of 8x is the default): L & R Part Gain 11x Gain 8x Gain 5x Gain 2x R3 100Ω 182Ω 392Ω 2.49KΩ R4 1KΩ 1.21KΩ 1.5KΩ 2.49KΩ C2-C5 22pF 33pF 47pF 100pF These values were carefully tuned for the an optimal combination of speed/bandwidth and stability. The β22 should not be operated with a gain of less than 2x.

Since that DAC is SMD, it might be rather easy to just parallel a resistor on top of the current I/V resistor. Figuring out which is the I/V resistor might be somewhat fun, though it would be on the first opamps. It would need to be lowered some in value to decrease the output level, so paralleling a 10K or something might be good. Lowest gain on the beta is 2, so no joy there.

Ya know, if you want to hold off on the SumR's until a proto is built, I probably won't be using the 120VA 2x30V fully shielded SumR I have for awhile. Someone is welcome to use it to test with as long as I get it back in the same condition that it leaves here in

Anyone played around with these guys stuff: Grimm Audio Just curious...

Can you adjust the gain of the b22? Amb shows R3/R4 values for a gain down to 2 (which is as low as it can go)? I would think that would be better if possible. Otherwise, yeah, you will want to use good resistors. There are some resistors in the amp that are also in the signal path, so I'm not sure that going really special here (TX2575s, etc.) will buy you that much over something like Dales or PRPs.

Dynalo? Interesting meter. Good deal?

Black Angels-Directions to See a Ghost

Yeah, that's really awful. Sorry to hear that.

Supertramp... Live in the City of Lights (IIRC)... Simple Minds as well (their live album in Paris) The Sensational Alex Harvey Band A Flock of Seagulls (I just love the guitarist's sound) thats all I can think of right now

Are the "opamps" typically used for this application something like the DRV-134? I have heard that these are not transparent (but have not heard for myself). That said, doesn't THAT Corp make some THAT opamps that supposedly are quite transparent in this application? Transformers, no matter how expensive, still have non-linearities AFAIK, so in actuality may not really be better for this application... That said, this entire post is from various reading and not based on personal experience. Quite possibly molto-FAIL Just curious for any more explanation...

Happy Birthday Al!

Happy Birthday!

That looks really nice!

x2

Damn, nice work!

I thought those were the power transformers?

4700uf seems huge for coupling caps. If as you indicate these are 16V caps and are blocking 25V, they won't be (blocking) for much longer... Are you sure these are coupling caps and not power supply caps?

BRMC-Baby 81 Portishead-Dummy Joy Division-Substance

Well, you know you'd get = buyin

Did you look at the suggested prices on those? Actually, I think I may have 3 of those around, forget where I got them from. Smeggy: Partsconnexion is having a Bargain Basement sale on odds and ends they have laying around, and they do have some feet that sound like they would be nice. Go here and click on the bargain basement sale thing to grab a pdf of what they have. Some machined aluminum feet (sets of 4 for $2 or $5). Maybe something in there you might like, though they seem to lack the bling factor you seem to be seeking to emulate

Yes. I figured it had to be something different than the TO3s I am used to. I couldn't fathom how you were going to do those Yes, design by committee is a big no-no in my eyes. Ironic that I am one of the committee voices

Looks very good Jacob. The only request I would have would be: on the input pads: could you add a ground pad so that a Molex KK 0.100" connector would also fit? I personally like using these over the Phoenix connectors. I'll have to look again, but I would think the TO92 regulators would fit the TO220 pads alright, and I don't like normal TO92 pads anyhow (if not inline, and too small). Otherwise, I agree with the other comments. I'm curious as to how Marc plans on mounting/heatsinking a TO3?

Season 2 started this past Sunday. Pretty intense episode, could be a good season.

I don't know what made you think they were sending an entire PCB (module?). It was pretty clear to me that they were just sending a single UltraAnalog D20400A module (more like an HDAM than a DAC chip). As far as trusting anything that is put up on AudioAsylum, do so at your own risk. Personally, I wouldn't. The technical level of many seems to stop at what kind of faceplate to use on their Oyaides...