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Old 8th February 2001, 01:15 AM   #1
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I have a pair of Paradigm active 20s and for those who don't know they are active, bi-amped, speakers. My current preamp is a H/K dolby prologic with tuner. My goal is to take a DIY preamp stage and replace the H/K preamp stage. This allows me to keep the tuner and remote, etc. My problem is which one to build. I am leaning towards the balance Zen line stage, since the Paradigms have balanced inputs. Does anyone have any suggestions for a superior preamp? I would even consider a tube pre. How much money are we talking to build a balanced Zen?

On a side note, is the Basslist still in existance? It has been about a year since I last subscribed.

TIA,

Ben
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Old 8th February 2001, 03:20 PM   #2
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I use the balanced line stage and it is great.
One thing you need to know is that it generates a lot of heat. It cost around 170 USD or 350 DM. With 2 100VA toroids special SCR caps in the output and alps Pot.
So it can cost even less.
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Old 9th February 2001, 12:06 AM   #3
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Question Parts sources?

Where did you buy the transformers and caps? What voltage caps did you use?

Also, could you describe the sound... what is it comparable to?

Thanks,

Ben
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Old 9th February 2001, 12:48 AM   #4
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The sound is incredible.
I have never heard anything better.
Anything using opamps canīt reach it.
I first used a preamp that was a design from elektor magazine. It was a 2 stage line amp with one stage buffer and one stage amp. It used in each stage a ne5534. Typical for a normal preamp. Most comercial ones use them 2.
I used some "op" some "tl" everything you can imagine. Some of these opamp cost very expensive. When I reached the preamp to a very good level, I read the Pass article of the balanced line stage. I was shocked because it was so simple.
It cost cheap too. When I made it and first listened to it, my first reaction was to throw my old preamp away. haha !
Yeah I was pissed I spent so much time with opamps and money to mention. With half the money I made an excelent preamp. It was the first time I listened to a voice singing and I could actually hear the air. Funny feeling !
The parts I got from here and there. I was in Greece then so some store ordered them from Germany I think.
But it doesnt matter you can find the parts anywhere.
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Old 9th February 2001, 01:09 PM   #5
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Default Hmm What to do?

I've completed phase one of my audio projects. (2ways and a sub) Now it is time for phase 2 the pre amp. I started collecting parts for an op amp pre amp and active crossover. Your comments about the line stage interest me however I have not seen schematics for non op amp active filters. I wonder if it would be worth building the line stage only to pass it through an op amp filter? Any Thoughts or has anyone seen plans for active filters that don't use op amps?

Wade
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Old 11th February 2001, 07:06 PM   #6
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For better quality you can make descrete opamps from the
Pass site in the projects section.
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Old 12th February 2001, 06:59 PM   #7
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Although I've not tried it, you could probably make a filter with either a single BJT or JFET. For the JFET, bias the source with an matched JFET operating at IDSS. Then use the JFET as a unity gain buffer in a Sallen-Key topology.

Alternatively a BJT in a common emitter configuration may work well for the MFB (multiple feedback, but would take careful biasing.
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Old 29th May 2001, 12:20 PM   #8
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I am intressted in building the Balanced line stage.

But I have some Lame questions!!! How do I use the Gerber files posted at the passlabs site ???

Can I use them in a EE cad or what???

Best regards

__________________
///CF
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Old 29th May 2001, 01:45 PM   #9
tvi is offline tvi  Australia
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Have you looked at the "SE BALANCED ALL-JFET LINEAMP"
at: http://www.borbelyaudio.com/index14.htm
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