Any DIYer s out there ?


I know from reading some of the posts that there are other "DIYer's" out there. For those that don't know what "DIY" means, it is an acronym for "Do It Yourself". I'm particularly interested in knowing what you folks have built or modified. You can go into as much or little detail as you like. Since i started the thread, i'll do the first post.

I started off by trying several different "homebrew" speaker cables. From there, i went into building interconnects and then power cords. Somewhere along the way, things got more serious and i began to tear into existing designs and "make them better". I've modified a couple dozen sets of speakers, built and desiged speakers from scratch, modified amps and am even building one from "accumulated parts". I've also built sound absorption panels and bass traps courtesy of Jon Risch's website.

I've continued doing this as i find great pleasure in knowing that i helped contribute to the enjoyment of both my system and several others in a "special" way other than just by assembling the various components. It also keeps me out of trouble and minimizes cash outlay for "manufactured" goodies. After all, what one can buy for $1 can be made for $0.25 to $0.60 and be done MUCH better.

Anybody else like doing this kind of stuff ? Don't be shy or modest. Tinkerer's are welcome and PLEASE, go in to detail about your favorite "projects". Sean
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sean
To start out, this is a great thread. The following is only my opinion on some of the above ideas. I really want to continue to exchange these ideas and discuss any and all implications. If this leads to some heated discussions, then I say GREAT. I have found that the best understanding of a topic comes from defending one's position. I hope this thread can enlighten us all to the wonderful world of DIY audio. And now my ideas.

Ehider, I can really relate to your enthusiam. I can remember when I 'discovered' the differences of crossover components. I also agree with Trelja about the simplicity of a crossover for his (tube) application. (and yes you are a DIY'er) Neither approach is fundimentally more correct than the other. My experience indicates that to get good results with a simple crossover that the drivers and cabinet must be selected VERY carefully. This may not be possiable when you are trying to modify a speaker you already own. In the latter case a zobel may be the ticket at the expense of power consumption.

On the topic of circuits, it is not always safe to just replace transistors in an amplifier with what is percieved as better units due to the possibility that you may change the stability of the amp. If the transistors are wider bandwidth, you might make your amp into a high powered oscillator and smoke your speakers. If one has access to an oscilloscope, the stability of the modified amp can be easilly checked. The bias current of the output stage will also need to be adjusted in some cases. I agree that the difference can be audible, but we must be careful! I recall where a friend of mine was told to increase the size of his power supply caps. He did, by a factor of 10, including some caps that were not in the power supply, and now the unit is dead. A lot of this DIY stuff is very easy to implement but common sense must be applied.

It is also a super cheap tweek to replace the resistor in the differential input pair with a current source. I have done it a dozen times and every time I am blown away with the improvement. Siliconix may still make a current source 'diode' that looked just like a reistor. It was simple to replace the resistor with the FET current source as long as you knew the correct value of current source to buy. I will research the availability if anyone is interested. The Aragon 8008BB already has current source transistors in the input stage but I don't know about the other models. Please let us know about the input configuration of any models you are familar with. BTW there are several easy mods for the 8008BB.

I have not heard of putting caps across the fuses. I must admit this is so simple that I feel stupid for not thinking of it. If the unit has DC power supply fuses (like the 8008BB) the caps would help to deliver transient currents to the board and ultimately to the speakers. The only place I would not put a cap is across the AC line fuse. On second thought, that might help get transient current INTO the power supply! Let's hear (see) everyones ideas on this. The cap would need to be small enough that it would not power the unit if the fuse blew, but large enough to help get transient current around the fuse. Are there any implications we need to watch out for?

Trelja, there are many people that believe the cold weld is the way to go. WBT makes an RCA that does not use solder. My many years in the aircraft industry has me very familar with the crimpers you mention. They are very pricey!

THIS IS A SUPER THREAD! Maybe we can get some of the non believers to try some of the DIY cables or some simple cap modifications and listen for the difference. Under the controlled conditions of their own system they may begin to understand what Walt Jung told me "Everything makes a difference".

I enjoy looking at schematics, quite often I get an idea or learn of a new part from looking at them. If you can get me a schematic I will be willing to try and assist anyone with a mod of their electronics. My business does take me out of town all the time but I will respond to email as fast as I can.

Chris Owen
Comm-Tronix@KScable.com (work)
thank you for posting this thread. I DIY all of the time, from speakers, preamps and amps. I just rebuilt and up-graded the base to my REGA table. I also up-graded the shelves in my equipment rack by gluing a sheet of dense fiber board to the bottom side, then using a .020-.030 sheet of sorothene type material in between another sheet of fiber board. It added a lot of mass to the selves and had a positive effect using them under my tube amps. Hi-Fi and music is my hobby and one of the few hobbies I know of that can cover so many areas of interest.
I have become a first time DIY'er without intending to do so. I bought a pair of Apogee Stages because the price was right and I have always been intriuged by what people said about them. LOVED the sound immediately but thougth it had some shortcomings as well. The good folks at the Apogee web site suggested crossover component upgrade and the descriptions of the improvements were compelling. I went the Northcreek route and replaced the stock ASC caps with Northcreek caps in a bypass arrangement. I am happy to report that the across the board improvments were WAY beyond what I had expected . . .wider, deeper, blacker background, smoother yet dynamic and detailed. It was a shocker to me. I expected a tweak and got a major component upgrade. Well, naturally I am taking it to the next (and pricier level). I have ordered 8ga inductors with some of the lowest DCR values around and plan to construct an external crossover board to house these larger and better components. If it gets much better than it is now, I will need to purchase incontinence pads.