41Hz AMP15-PS XP UPDATE #3

So I've continued my work with the amplifier and soldered tha cables and jumpers to place. But I also got to know that I've mounted the diodes the wrong way around. The anodes should be towards the FET and I've mounted the cathode towards the FET. So this means I will have to remove two of the cables, all four diodes and one resistor and then turn the diodes with the very short legs and then put everything back in place again. I'm a bit disappointed at that, not very clear assembly instructions to be honest.

But after I've done that I should be ready to go, just clean the board with something (I heard denatured alcohol would be okay), put some heatsinks on the transistors for the pre-regulators. Also remove all the screws and bolts from the TO220 devices as apparently the heat slugs carry voltage. Will have to use some glue or something to hold the nylon washers in place.

Click for a bigger picture

Click for a bigger picture

Click for a bigger picture

Click for a bigger picture

Diodes correctly mounted with the anode towards the FET. Click for a bigger picture.

41Hz AMP15-PS XP UPDATE #2

My first post about this amplifier can be found --here--

So I'm pretty much finished with this amplifier now. Both toroid inductors are done and soldered into place (this was a hell of a job!). Soldered the four remaining small capacitors and then the massive bulk capacitors. Damn they're heavy!

What remains now is to find out how to place the jumpers, put some wires on the back of the board (I don't know why but I've seen on pictures that there are a couple of wires on the back). And when all this is done I'll have to test it to make sure everything is OK and then I'll mount the IC and hook it up to some speakers and see what it can do.

Before the bulk capacitors. Click for a bigger picture.

Everything mounted (except the IC). Click for a bigger picture.

Click for a bigger picture.

41Hz AMP15-PS XP UPDATE #1

My first post about this amplifier can be found --here--.

So, I've found out how to properly solder the surface mounted resistors on the back and finished soldering them. I've also found out how to identify the different diodes. There were one 10V diode and one 13V and they looked exactly the same. I was told at diyaudio that there should be numbers written on them so I took a magnifying glass and managed to find the part numbers and googled it. Soldered them to place on the backside in parallell with some resistors. Very hard work getting it right and avoiding shorts.

Click for a bigger picture

I've also soldered some more capacitors and a transistor.

Click for a bigger picture

Click for a bigger picture

As you can see in the picture I've winded one of the ferrite core inductors but I am unsure if I have done it properly or not, so I'm waiting for somebody to judge my work before I solder it to the board.

Speaker treatment, true or bullshit?

Speaker treatment, true or bullshit?
More about EnABL here:
Listening impressions & techniques

CSS EL70eN. Click for a bigger picture.

Technical discussion

I have yet to find my personal opinion. I own both treated and un-treated CSS EL70 but I haven't done an A/B comparison. The initial differences though were that the treated one sounded slightly warmer than the un-treated driver did.
And then one should not forget the fact that the treated drivers bought from Planet10-hifi are matched pairs.

41Hz AMP15-PS XP

Yesterday I started working on my second amplifier, the AMP15-PS XP from www.41Hz.com

I continued today and this is how much I've done so far. Pretty much all of the tiny components are done but there are some questionmarks which I will have to solve by consulting some friends. And I will have to wind the toroid inductors somehow too.

Click for a larger picture