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Thoughts on this kit [message #60965] Mon, 21 September 2009 15:25 Go to next message
colinhester is currently offline  colinhester
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Poking around on DIY Audio Projects (http://www.diyaudioprojects.com/) and found this little kit http://www.diyaudioprojects.com/Tubes/6418-Tube-Preamp-Headphone-Kit/ Any thoughts? Looks like it might be a fun weekend project and not too 'pensive......C

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Re: Thoughts on this kit [message #60973 is a reply to message #60965] Mon, 21 September 2009 21:59 Go to previous messageGo to next message
Shane is currently offline  Shane
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That's a pretty cool little kit. There was all sorts of talk about pencil tubes last year? on Head-Fi/Headwize and people were p2p'ing them, but this is the first PCB I've seen. Neat little tube equivalent of the CMOY.

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Re: Thoughts on this kit [message #60975 is a reply to message #60973] Tue, 22 September 2009 13:39 Go to previous messageGo to next message
SteveBrown is currently offline  SteveBrown
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It uses op amps! Oh no! That's not a tube preamp! Rolling Eyes

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Re: Thoughts on this kit [message #60976 is a reply to message #60975] Tue, 22 September 2009 14:27 Go to previous messageGo to next message
Shane is currently offline  Shane
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SteveBrown wrote on Tue, 22 September 2009 13:39
It uses op amps! Oh no! That's not a tube preamp! Rolling Eyes



op-amps are the devil's work Twisted Evil Nothing kills the sound faster Rolling Eyes

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Re: Thoughts on this kit [message #60977 is a reply to message #60976] Tue, 22 September 2009 17:39 Go to previous messageGo to next message
Wayne-o is currently offline  Wayne-o
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some op amps are bad from the word go. the plus and minus power supply must be the exact voltage to work correctly. Bob Carver has info on this, he and others were duped into using op amps that were defective. A lot of kenwoods, sansuis used these op amps , They sounded distorted, this could not be fixed without redesigning the preamp circuit. this is where the bad rapport came from. Op amps are supposed to sound good if done right.

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Re: Thoughts on this kit [message #60979 is a reply to message #60977] Tue, 22 September 2009 19:10 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
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Burr Brown's are really nice. A bit pricey though.

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Re: Thoughts on this kit [message #60987 is a reply to message #60979] Tue, 22 September 2009 21:19 Go to previous messageGo to next message
Shane is currently offline  Shane
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Wayne Parham wrote on Tue, 22 September 2009 19:10

Burr Brown's are really nice. A bit pricey though.





Yah.. That's all I've used in my builds. They have a distinct sound as compared with a couple of the other's I've tried. A little smoother, "darker" sounding for the most part. Others have had a more edgy high end and more pronounced grainyness.

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Re: Thoughts on this kit [message #61011 is a reply to message #60977] Thu, 24 September 2009 10:44 Go to previous messageGo to next message
SteveBrown is currently offline  SteveBrown
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Yep, I was only half kidding. I recently did some tests w/op amp as a preamp. Some turned out pretty good, but what I did was build a PS with Black Gate electrolytics, and film bypass, in the pre I used paper/oil output caps, and a TKD volume pot and tantalum resistor for feedback. So yes, if you surround it with premium parts and you use newer generation op amps (no 741's please!), I think you can do well. Switching back to all tube, however, soundstage improved, tone improved, etc. Not a night/day difference, but if I had the option (which I do), I would not use the op amp route. Speaking of which, I need to draw up a picture of my latest line stage. It sounds amazing (IMHO). Very simple, uses one Russian 6N6P, and a shunt reg PS.

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Re: Thoughts on this kit [message #61016 is a reply to message #61011] Thu, 24 September 2009 18:38 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
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Very cool, can't wait to hear more about your 6N6 preamp!

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Re: Thoughts on this kit [message #61021 is a reply to message #61011] Thu, 24 September 2009 21:15 Go to previous message
colinhester is currently offline  colinhester
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SteveBrown wrote on Thu, 24 September 2009 10:44
.....I need to draw up a picture of my latest line stage. It sounds amazing (IMHO). Very simple, uses one Russian 6N6P, and a shunt reg PS.



I assume you are doing this as I type. Get 'er drawn, Steve.

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