SYMEF amplifier

[OnAudio]

Why not you? How about you show us some pics of your own build! 😀

Do

Picture a world where Serena Williams dad tells her, "I can help you become the world champion" and she replies, "show us your gold first"

 

[Jay]

If SYMEF sounds good, that's understandable. But saying that 1DIFF something is as good or even better is about too much and made me suspicious. But I will build the 1DIFF after finishing one or two other amps for sure.

 

[pinnocchio]

Picture a world where Serena Williams dad tells her, "I can help you become the world champion" and she replies, "show us your gold first"

ha! ha! vewy funny... 😉

 

[OnAudio]

If SYMEF sounds good, that's understandable. But saying that 1DIFF something is as good or even better is about too much and made me suspicious. But I will build the 1DIFF after finishing one or two other amps for sure.

Suspicion is a good thing. We need to get to the bottom of this. 32 1DIFFQC boards will be on offer for free soon. Looking forward 😉

 

[bambadoo]

Maybe it has been said before but what is the imput impedance of the SYMEF?

 

[AndrewT]

R20 in post5 shows Rin value.

 

[OnAudio]

I can only think of one group of audio specialists who could have wiped out the stock of MJE15034/35 at mouser and digikey😉. Good job. There is more at newark. Hope mouser and digikey restock quick.

Now lets have those results😀

 

[bambadoo]

Fastening symef amplifier boards to heatsinks now... Boring...

Any good advice in doing this easy and good?

 

[pinnocchio]

Fastening symef amplifier boards to heatsinks now... Boring...

Any good advice in doing this easy and good?

How did you mount the transistors (bottom 90 degrees or top straight)? Pictures?

 

[bambadoo]

Pictures will come... Patience my friend 🙂
I am 10% done... Drilled 2.5 mm holes after measuring the pcb´s to the heatsing.. Making 3mm skrew holes after.. (milling tool? - Don´t remember the english word for it)

Like this..

An externally hosted image should be here but it was not working when we last tested it.

 

[bambadoo]

It will be something like this I guess.

 

[OnAudio]

I am sitted on the edge of my seat half a world away 😀 .

 

[bambadoo]

I am sitted on the edge of my seat half a world away 😀 .

😀

 

[nakamoomin]

Guess I should post a picture as well..

An externally hosted image should be here but it was not working when we last tested it.

 

[nakamoomin]

All that remains is hooking up the PSU. I think the heatsink look a little puny. I'm searching for some bigger ones. The building of these amps has been a little slow. I just bought an apartment and it was in dire need of some remodelling.

If anyone knows of some nice, suitable and reasonably priced heatsinks let me know.

 

[OnAudio]

Guess I should post a picture as well..

An externally hosted image should be here but it was not working when we last tested it.

Nice work.

 

[bambadoo]

Really nice nakamoomin ...
I went out training this evening. Must buy more tools tomorrow to finish this...

 

[bambadoo]

Not much new but I guess the modules are more or less finished.

So what remains is to make a good psu and cabinet of course..

 

[pinnocchio]

Not much new but I guess the modules are more or less finished.

So what remains is to make a good psu and cabinet of course..

I'm curious to know why you use such a high quality cap on the zobel? This is something I would normally use on a signal coupling... Just curious.

Do

 

[bambadoo]

Just what I had in the bin.
However my experience from making tube gear is that everything that goes into "gnd" is of importance soundwise.