My Take on X-BOSOZ

[steenoe]

I'm calling them back in a few minutes to ask about the 20uF Solens. Any opinions?

The Solen caps are just great I guess my preference for the Jantzen caps is because they say "Made in Denmark" Which they aren't anyway's Solen caps has a very good reputation though, so I wouldnt have second thoughts about ordering those

Steen

[Duck-Twacy]

Brian,

Thanx for the estimate on the shipping costst. Total for me would be around $125 (for 2 toriods incl shipping and taxes). Probably the Schuro's 160VA 55V+9V wil be around 44 euro a piece (excl shipping), so probably 110 euro total (which is about the same). Because I sometimes have problems with customs (delays, wrong adresses etc), a European supplier is a bit easier for me.

Btw about the caps, I don't mind waiting a few weeks more. Personaly I prefer the best parts (within reason), just for peace of mind. Of course I have no experiece how good the Daytons sound, or Solens.

On the other hand, you guys are in control. Things must not get too complicated to organize.

Ronald

[metalman]

My pre uses 10uF Solen's!

[BrianDonegan]

PE is saying 30-60 days for the Jantzens. I am going to go for the Solens, assuming they are in stock.

[steenoe]

For outputcaps for the twisted BosoZ I actually did try a lot of caps, just for the heck of it I am normally not too biazed towards any particular brand Well, if it sounds good, it is good dont you think? Well, I listened to Jantzen, Audyn, JCR and Mcap and Mcap Supreme, rolled polyprops and ofcourse my alltime favourite Rifa PHE426
To tell you guys the truth, I really didnt hear any difference At least no difference that was worth mentioning Sooo, ofcourse I put back my PHE426's, just to make sure I would feel good
And I do

Steen

[steenoe]

If it didnt come clean in my previous post, I can recommend the Solen cap. I did participate in a few listening tests, (mostly with speaker X-overs) and the Solen caps are not lacking soundwise
Well, you wouldnt beleive what a "blindfold" listeing can result in The Solens did pretty good, and so did the Jantzens. All the others did place in after those I was pretty glad to see the Mcaps at 3' or 4' place

Steen
Edit: If you want me to elaborate even further, let me know. I would have to pick up the notes from a friend of mine though!! We did write down everything carefully, but ofcourse I remember only the headlines

[Russ White]

OK Folks,

Since I want balanced inputs/outputs for my preamp I started weighing my options for an attenuator, there are quite a few, but most good solutions are either a real pain to build (so type of stepped attenuators for instance) or simply don't work as well as hoped.

4 ganged pots are very expensive and may not really satisfy.

So I did as many have before me. I reinvented the wheel. I know a million people have probably done a circuit like this, but it is so simple I couldn't resist.

Here is my plan.

1) Create a 32 step attenuator using 5 good small signal relays (G6H) using a voltage mode R-2R ladder circuit for the signal attenuation. This will give me a constant output impedance with varying imput impedance, since all my (actually almost all) sources have very low output impedance this is not problem at all.

2) Create a PCB which will allow for good quality resistors in the ladder like Dale RN60s and such.

3) Keep it simple enough that a singe 8 pin uC is all that is needed to drive the logic.

4) Make it smallll!!!! It should fit very easily into the preamp case without being intrusive at all.

Well here is what I have so far. If there is any interest I will spin this off into another thread.

Here is the Schematic for the attenuator:

[Russ White]

Here is the controller PCB (just one of many posibilities)

[Russ White]

Here is the attenuator PCB:

[hayenc]

Russ,

Did you abandon the DS1868 idea? I was starting to work on that solution as a way to come up to speed on PIC's.

Craig