ujamerstand

Mind if I join the party?

The new 6 layer board already cost less than the original estimate. Might as well go with the one with better layout.

That's about $1200 for 4 channels. It surely has to sound better than a quad RK50!

Well, it's just swapping the resistor set for another one. It shouldn't be too hard if we include some preset values on the BOM for people with blank boards. OTOH, for people with assembled boards maybe we should have a single version to keep the price down? What do people think?

You just made my day there. Lego and Minecraft. Two of my favorite things in one post.

Need to build this in minecraft.

Excellent!

Price looks good. BTW, what's the input impedance of the KGITSOJC circuit?

Link to the BOM: here It's hard to find all the resistor values from the same manufacturer. I also couldn't find 2 values in the appropriate package or in small quantities. Manufacturers are mixed and matched right now, but all of them are ±100ppm/°C, 1% 1W thick film resistors. Also need the value for the compensation caps. If anyone wants to edit or have it in a excel file let me know.

which resistor are we using here? These? Also relays? I'll quickly put one together.

This would be quite useful. I could imagine attenuating two separate streams to two different people. Or do channel matching for testing headphones.

I would be interested in boards. I've been waiting for a good, reliable, relay based attenuator solution. If we are doing a GB on the relays I'd be interested in that as well.

I remember KG said something about 2sa1968 sounds sweeter. But you can run the ixys part at a higher voltage, resulting in a larger voltage swing; and it is not being discontinued like the 2sa1968.

The new boards are looking good. You could even use the unused ccs holes as mounting holes to the angled brackets. Quite nice so far.

Yes, I too would like to build the outboard version. Not only could we run the output stage at a higher bias, it is more compact as well. Will the ixys current source be added back to the outboard version?

Oh, that's perfect.

Found out that we can edit posts loooooong time after the 15 minutes mark. Bug or feature?

Us Canadians get the same shaft as you do.

don't forget the new hybrid shunt supply!

Hurray for summer time! I'd love to get my sweaty paws on some pcbs. Looking forward to see the dynafet!

Woah. Looks hefty. Do you mean both series and shunt versions when you said both versions?

excellent!

Congrats guys. Please let the rest of us know how they compare with the O2!

Good Job! Just a little more and you're done!

I built the hybrid version. TBH, It's still pretty good. It's just that it is not as good as the KGSS. For one, Bass is more present on the KGSS. I like that better. I also felt that the KGSS is able to render complex passages better. I can't detect any distortions (like clipping) in those passages on the KGSS, but sometimes on the exstata it's there and it's more noticeable when I have the volume at 12 O'clock. The distortions I've experienced does not limit to clipping though, I also felt that amp could not keep the volume on a constant volume during certain passages, as if the volume would vary ever so slightly. Both of these things occurs really rarely, but it bugs me when I notice it. If you really want to build one, just don't go all out like you normally do. I've never heard the 407 before. I do have a pair of 404s sitting around, but I'm not brave enough to do a driver swap with my 507. From what I read it is very similar to the 507s though, but I think that the weak seal with the default pads (compared to the 507) would mean that the bass would not be as good as the 507s.