It means one psu and one amp unit for left and right channel seperately under single ended operation

Quote: Originally Posted by Azure I'm getting the M3 from SFT Audio. I was shooting for ~$300, but it ended up being $350 because SFT Audio is located in China. Oh well, not too bad I live in Taiwan, not China. It's a long story to say about Taiwan and China, so, forget it....

It's better to turn off every day, but needn't turn off every time. Just my opinion

100K

Quote: Originally Posted by Juergen I have made a few inquiries. Do you know if there is a way to tell if it is a first round board? I seem to remember that the trimmer was not on the earlier boards? Your board is the final correct version with big Cap layout. I'm sure some of...

Try to get a new ps pcb in US. some of the first round group-buy pcb are not OK. Just my 2 cent opinion....

Quote: Originally Posted by Juergen Actually I did that. I placed the 338s & 541s in the pcb holes and then attached them to the heatsink with the bolts then soldered them in. Unfortunately I just pulled the 541s to the heatsnk from the bolt which is near the top, but the bottom of the...

I suggest you to lock the 4 ICs (2 lm338s, 2opa541s) to the L bracket first, then attach to psu pcb and solder them last. Its a not bad idea to lock part on HS first, then solder it to PCB to make sure perfect contact between part and HS.

Every amp is custom-built so far, so it's hard to answer your question, but i'm sure $1000 difference is too much.

Let me compare in more details about the three ps units of previous dynahi-sa, current dynahi, dynahi pp. size: previous > pp > current complexity of circuit: current > previou > pp sound quality : x > y > z (left for you )

Thanks for all the impressions of dynamight. These opinions are helpful to me. Corda Aria looks so beautiful and i believe it sounds sweet too.

From tech. view: M3: one active ground channel for left and right channel. (to stablize "ground signal") Bal. M3(precisely speaking, bal. M2): two active inverter(amplify) channels for left and right channels(to pull diaphragm...) Does it sounds better? who knows.....it's a subjective...

That's reasonable. It's possiable to lower futher output impedance by choosing output transistors and following the origianl feedback. Thanks for your reply. ------- OK, this is the result for dynalo psu: +/- 16.4V, gain=9X No load, max output swing=5.8V rms dummyload= 51R//91R...

Quote: Originally Posted by amb In contrast the dynahi's output impedance is about 0.5Ω. All of this was measured at 1KHz. gain=?, hfe(power transistors)=?(roughly) Sorry for my "short english"...

4.3V rms for dynalo powered by +/- 16V psu seems to be a little low let me test it to see the result...

Oops, it's not my Dynahi, Kevin finished 99% work. I just solder parts and load them into a chassis.I believe there are many excellent builders in north America build wonderful dynahi too.

grease compond help to fill the gaps formed by two rigid interfaces.(ex mica and HS). I don't think it's helpful in this application. Basically grease compond is not a good thermal conductor. off topic...

1]the silicon wafer + compond is not a good idea. 2]It looks like something wrong with the amp unit. try to resolder two 500R, clear pcb carefully then solder again.

some suggestions 1] test the psu with two 10K resistors as loads to see if the psu is OK. 2] erase the heat transfer compound under silicone wafers.(amp unit)

That's all Kevin's fault because he forget to lay the position for power-on indicator LED. just kidding... seriously, Dan have done a great paper work for dynalo, this is unselfish and geat work IMO. i learn a lot from that and I think it's very helpful to build dynahi.

A SA is more sutiable in this application.

the dynahi's gain setting is not for K1000 even at "high" position because i dont' know it will be taken to drive K1000.

Quote: Originally Posted by Jon L Hmm. Can Stereo Dynahi's ground pin be split to 2 leads to at least technically be wired to 4-pin XLR without burning something down? It won't be "balanced," but K1000 doesn't require 2 separate - runs. Currently I can power K1000 with it's two - runs...

Sorry, let me try to answer the quesions enen though i know just a little. Quote: Originally Posted by Jon L What's the max current output, enough for my AkG K1000? For dano's dynahi, the max ouput current is 1.5A, it's enough to drive K1000. Quote: Is there any...

Some tech. information comes from Kevin about 3 monthes ago, FYI ．a bryston like output stage ．Built in lithium ion and digital based charging/safety chips. ．the led eats up more current than the amp does when there is no audio signal p.s. I am in no way shape or form, financially...