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Old 6th August 2004, 05:56 PM   #1
coils is offline coils  United States
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Default x-bzls finished!

I just finished my x-bzls, which was my first hi-fi diy project. The next phase is a 5 watt x-soz which I have all parts for except some case material, and also a Jt-DAC no. 3 with balanced outs. I checked every thing that I could with a meter, and it all looked good. I have no other balanced equipment, so I connected an unbalanced source and an unbalanced amp.... I was stunned!

I wanted to wait to post this until my project was complete, but I am so ecstatic that I can't see straight. Given all that I have read about unbalanced operation, I was'nt expecting the dramatic improvement in sound quality. Now I will work dilligently to finish the rest of my system.

All of my equipment is low-end consumer. My source is a sony cdp291 and the power amp is a little 20 watt tascam (very gainclone-like). My speakers are Bose bookshelf (PN#?)

This pre-amp has +/- 50 volt rails and has 600 ohm power resistors, 20 uf (2x10uf parallel) output caps and 39 k feedback R. R15 is shorted. It also has 10k input and output attenuators. Also, I used KK boards, as my press-n-peel boards had some trace problems.

A sincere thanks to NP for sharing this work... I can't believe I made this! Here is a link to some pics. Also Thanks to Henrik for making the Simetrix sim files, as I used them to help my component selection.

Any one considering making a bzls, it well worth the effort.
pics

Thad Howard
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Old 6th August 2004, 06:02 PM   #2
Vivek is offline Vivek  India
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Neat job mate. The knobs and the case are very good looking too.
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Old 6th August 2004, 06:35 PM   #3
steenoe is offline steenoe  Denmark
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That is one cool Preamp. What are those transformers?
If this is your first: Congrats!! Very neat.
You can end up with a first class set of equipment.
Keep it up, and keep posting!!!
Very nice!

Steen.
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Old 6th August 2004, 06:55 PM   #4
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coils,

Very good job on the enclosure, prefect.

Regards.

Alain.
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Old 6th August 2004, 07:11 PM   #5
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Very nicely done!

You should submit some pics to the PassDIY gallery.

Cheers,
Dennis
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Old 6th August 2004, 07:45 PM   #6
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First, you said?

What rotary switches did you use?

Thanks for share your impressive job and congratulations

JC
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Old 6th August 2004, 08:00 PM   #7
Netlist is offline Netlist  Belgium
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WHooooooooooHoooooooooHooooo

Veeeery nice

/Hugo
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Old 6th August 2004, 08:18 PM   #8
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If you hadn't told us, I'd have said it was your 31st DIY project. Very Nicely done.
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Old 6th August 2004, 08:49 PM   #9
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Thumbs up SWEEET!

Great Work!!
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Old 6th August 2004, 08:53 PM   #10
mlloyd1 is online now mlloyd1  United States
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Quote:
Originally posted by metalman
If you hadn't told us, I'd have said it was your 31st DIY project. Very Nicely done.
Indeed! VERY nice job!

So, how DID you do that lettering and artwork on the back?

mlloyd
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