hehe...thanks guys.
I think I may have just gotten really lucky with the hum issue. Although I did used the shielded Volex power cords and shielded interconnect wired straight to the amp boards. Oh, I also put a shield around the ac wires going from the transformer to the power supply circuit board. Last, when I was laying out the components inside the enclosure...I tried to keep the magnetic field from the transformers away from everything else inside.
Since I've got just a little bit of hum from my AKSA25n+, I'm going to try all of the above on it as well. These amps are powering the midrange in my tri-amped speakers...and the midrange comes in at 106db. So if I could knock the little bit of hum down to these...I'll be surprised
Hi Andy,
The transfomers I used in both of my AKSA25n+ and AKSA100n+ are both
rectifier transfmorers from Signal transformers. I used the 36-2 in the 25n+ amp and a dl68-4 for the 100n+. They don't seem to have a stocked model for the AKSA55n+. I didn't want to pay for a custom transformer, so the AKSA55N+ that I'll be building for my brother has a toroidal trans.
Both amps do sound good. But I would suspect that the toroids would sound good as well. On my first amp (the 25 Watt version) I used the rectifier trans. So, when it came time to build my 100 Watt version...I wanted to stick with the same type of transformer, just in case there was a slight difference in sound charactor.
But let me say...the transformers for the 100Watt are large and heavy! If I had to do it all over again...I would strongly consider the nice little toroids.
I suppose I'll find out if there are any differences once I get my brother 55n+ done.
dan
