DIY preamp options. - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 8th February 2001, 01:15 AM   #1
diyAudio Member
Join Date: Feb 2001
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.


  Reply With Quote
Old 8th February 2001, 03:20 PM   #2
diyAudio Member
promitheus's Avatar
Join Date: Jan 2001
Location: Germany
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.
  Reply With Quote
Old 9th February 2001, 12:06 AM   #3
diyAudio Member
Join Date: Feb 2001
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?


  Reply With Quote
Old 9th February 2001, 12:48 AM   #4
diyAudio Member
promitheus's Avatar
Join Date: Jan 2001
Location: Germany
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.
  Reply With Quote
Old 9th February 2001, 01:09 PM   #5
diyAudio Member
Join Date: Nov 2000
Location: Minnesota
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?

  Reply With Quote
Old 11th February 2001, 07:06 PM   #6
diyAudio Member
promitheus's Avatar
Join Date: Jan 2001
Location: Germany
For better quality you can make descrete opamps from the
Pass site in the projects section.
  Reply With Quote
Old 12th February 2001, 06:59 PM   #7
diyAudio Member
Join Date: Feb 2001
Location: Silicon Valley
Send a message via Yahoo to thespeakerguy
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.
  Reply With Quote
Old 29th May 2001, 12:20 PM   #8
diyAudio Member
Join Date: May 2001
Location: USA Dallas

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

  Reply With Quote
Old 29th May 2001, 01:45 PM   #9
tvi is offline tvi  Australia
diyAudio Member
tvi's Avatar
Join Date: Apr 2001
Location: Moonee Ponds, Vic, Australia
Have you looked at the "SE BALANCED ALL-JFET LINEAMP"
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
CCS Kit options eeyore Tubes / Valves 19 18th April 2009 03:29 PM
CD Options? renfrey Digital Source 1 5th March 2007 08:18 PM
DIY Amp/Preamp case options ?? alexcd Chip Amps 2 18th May 2006 05:25 PM
230 V. > 110 V. -- options? on the move Everything Else 2 25th July 2005 04:01 PM
Any Bi-Amp options? chris ma Everything Else 3 10th May 2002 10:02 PM

New To Site? Need Help?

All times are GMT. The time now is 09:16 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Đ1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2