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post #9601 of 9609

Thanks but to be honnest, there is very little in there I'd call my own. It's just a matter of putting together datasheets' suggested designs and reading what is suggested by more knowledgeable persons.

 

The tricky thing is that it's very hard to properly test such a DAC. Ok, there's no offset nor oscillation (that I can see with a 20Mhz scope) but, since it's better than my soundcard ADC (an aureon sky), I've no idea of actual performances, except it's better than 90db SNR and 0.0026%thd at 1K.

post #9602 of 9609

This is more a "work in progress" than a completed build, but I'm getting closer. My Bijou has been in a "temporary" case for about six months as I decide on a case design and find the materials for its permanent home. The chassis is going to be of Alaskan Yellow Cedar, with jade-green leather on the top-plates, and copper heat sinks for the FETs.
I haven't yet decided on the knobs. I'm leaning towards leather-wrapped wood, but that means finding someone to turn some of my cedar for me (I don't own a lathe). I'm also want to reshape the profile of these copper heat sinks to be domed so they better matches the tops of the tubes. I need to find a way to support the pins so I can file and grind without mangling them.

 

post #9603 of 9609
Quote:
Originally Posted by Johnthurston View Post
 

My Bijou has been in a "temporary" case for about six months as I decide on a case design and find the materials for its permanent home.

 

Nothing's more permanent than a temporary solution.

post #9604 of 9609
Quote:
Originally Posted by Johnthurston View Post
 

 I need to find a way to support the pins so I can file and grind without mangling them.

Ice? It would probably put too much of a limitation on working time to be useful, but clean up would be a breeze.

post #9605 of 9609

After what seemed to be a couple of years, I finally completed my Wire.  I have only had time to listened to a few albums but I am very happy so far.  This amp is a good match for my HD 600's but it will not play to full volume with my DT 880's, though at 600 ohms, it was expected.  A few pics.

 

Me

 

post #9606 of 9609
Very smart looking build.
post #9607 of 9609

musky - great job on The Wire. I've been using this amp for about a year and a half now and love it. OPC did a great job with the design.

 

I love your chassis that you use for all of your builds. Do you do the wood work yourself? or you have a custom maker?

 

I found with my DT880 - 250ohms (before I killed them with my current  EHHA build) that the volume was pretty damn good at around 3:30 on the dial. I also used a gain of 2 instead of the default unity gain. Maybe you might want to consider to add a little gain - 2 or 3 at most.

post #9608 of 9609

Nice build Muskyhuntr!

 

I see that it is still an interpretation of my theme... but you are more than welcome to use it in such a nice build.

I like how the two boards are facing each other but have the wooden volume under them ;) 

post #9609 of 9609

To answer a few of Mullets questions.  For the most part, I do it all my self.  Up until a year ago, my nephew ripped the the pieces for me on his table saw but a while back, I purchased my own and now do the ripping myself.  The final shaping is done on a table router.  Cutting a shaping aren't all that hard but the sanding takes quite a while.  I start with 80 grit and work my way through 120, 150, 220, and 400 grits.  I use 600 grit between coats of tung oil.  The wood used is Cocobolo.  I use it not only for it's looks but because it machines very well.  I actually tap the holes for many of the screws.  Panels are from Front Panel Express.  I ended up liking this wood so well, that I bought grips made from it for 2 of my guns.  As Stixx points out, the design is based on one he posted a few years back.  I have a couple of projects that I am currently working on (a dual chassis KSA5, a 300B amp, and probably AMB's Y3) that will use the same theme.  A few other projects will be using the Pesante Dissipante style boxes, most probably my Dynahi.

 

 

I have considered raising the gain on the amp, but as of now, I am undecided.  It does sound good with my HD600's.  It also sounds good with the DT880's, but the volume is just a bit lacking.  Decisions...decisions.

 

I have attached another image of the Wire this time stacked on top of my CK2III.  Front panels are identical except for the name badging.  Top, bottom, and rear panels are sized a bit different to account for slight differences in the size of the wooden sides.  On top of the stack is the wall wart I made that works with both amps (lucked out on that one).  In the back ground is my EHHA I recently re biased.

 

Me

 

 

 

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