Kerry

That's possible, but they should find the underlying issues as well. I use 60V parts in my builds, though my prototypes used BC557.

I'm not sure I see this. The BC557 are part of a current mirror for the error amp. One of them is bound to about .6V and the other I see peeking at around 7V in the simulation. I'm not sure what the AC or an overly spec'd transformer has to do with this. Also there is a natural slow start in the regulator so it comes up under 1V until it starts regulating. Are you actually measuring these values? I'd be curious if that's true. Reality and simulations don't always align. There are some conditions if the circuit is not put together correctly that they could fry but that's true of a number of parts.

The top plate took about three and a half hours actual machining, but I do it over a few days typically. My feeds/speeds are about 15" / minute with about .035" depth.

Thanks. The top/bottom plates are 3/16" and the face plate is 1/2". The sounds is amazing!

Excellent work John

I finally got the last plate machined. I had to replace the spindle on my CNC and also made a mistake on the CAD so had to redo this plate, but it's looking great now.

Yes. Great news!

Amazing :)

You'll need to measure the forward voltage in place for the led. Since it is running at a low current the voltage will be much less. I forget exactly, but those less are running somewhere around 1.8v which really changes the calculation.

So I've downloaded Roon and got a trial subscription to Tidal. So far, I'm impressed. The interface on my PC and iPhone are great. I don't feel constrained using the iPhone. I really am playing music I haven't listened to in for ever The synchronization across devices is excellent. I can see the zone support really working out nice for me as well. For now I have the server installed on my desktop, but this will change in the future. This is pretty much what I've been looking for so thanks for highlighting this here The sound quality seems great, but I haven't done any comparisons to JRiver yet. I've got a bit of a cold still so I'll wait on that. going into geek mode now... It's got some nice integration features as well. I'm going to have to build a Raspberry PI 3 bridge to AMB's γ24. I think I can take the I2S stream straight from the PI into the DAC through some galvanic isolators or put it through an ASRC first (not sure if this would help yet). I want to look at integrating the volume into the DAC as well.

I'd be interested in the friends and family deal Brent. Thanks

Yeah, I was curious what you wanted to the bananas for.

On Kevin and Birgir's latest SS Dynalo board the collectors of the transistors are mounted to a large copper pad and a heat stink is mounted to the pad.

Yes, but because we were saving space, we'll be mounting the heatsinks directly to the output transistors. You can see them mounted in my post above.

Just looking to get the bias back in line with original specs. That plus the heatsinks I was testing should put us around 110 deg F on the output sinks. The regulator sinks should also come down to 105 deg F. Need some parts to test.

What couplers are you using between the PS and amp boards? I like those.

Yeah, I'd like to blame that on my swipe typing, but that's a bit of stretch. Should be transistors

Looks nice. The bias voltage is fine. The TP is before the 5M resistor and directly reads 580V. Most multimeters have a 10M resistance on the print probes when testing voltage. This causes the drop. I'm assuming you wanted the 450V outputs to be 500V. I like the idea of the connectors but you have to make sure they have the proper voltage ratings.

Here's an update on the mini. I've got the external regs running now. This thing does throw off quite a bit of heat. I've some sinks on the output transformers now, but I'd like to make them a bit larger. The regulators heatsinks are going to about 140 deg F at their peak and I'm ok with that. I was testing at +/-14V before I put the heatsinks on. The bump up to +/-20V seemed to smooth things out a bit on the top and bottom ends. I'm very happy with this so far

Congrats!

Congrats Shame about the buzz.

Happy Birthday and thanks for all you do!!!

Almost there. I've got one channel dialed in and working on the second.

I got the parts in this afternoon and had a chance to start stuffing. Here's the back of the board. A couple of things wrong. The holes for the IEC inlet are a bit small. I can drill them out since all the traces are on the bottom. The other more important issue is I used the wrong size QFN-20 pattern for the regulators. Luckily I have an off-board option that I'll be using on this version. I ordered a couple of sig78/79 regulators from AMB's site. I can test the rest of the board so I will continue stuffing. Should be done tomorrow night.

Happy Birthday