Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

[ Follow Ups ] Thread: [ Display  All  Email ] [ Tweakers' Asylum ]
[ Alert Moderator ]

Re: Wait a little longer for


If I remember what Steve said, it is an attempt to have the best of passive and active designs. Something like, transformer-coupled phase-splitter-->shunt-type resistor volume control-->Fet buffer stage.

Ah, ok. I started down that path about 15 years ago with the AL-1, which Corey Greenberg based his Aunt Corey's Buffered Passive Preamp on. Though the AL-1 didn't use an input transformer and the output was an integrated circuit buffer (a PMI BUF-03).

It's evolved a bit since then with the addition of an input transformer and a switch from an IC output buffer to a discrete one. The current version uses a single-ended hybrid tube/bipolar follower.

It's currently driving a little flea-powered amp that uses the same basic topology but with a 1:8 step-up transformer for fully passive voltage gain.

Anyway, glad to see that this basic approach has worked well for others. It's worked quite well for me over the years.

se





This post is made possible by the generous support of people like you and our sponsors:
  Atma-Sphere Music Systems, Inc.  

Follow Ups Full Thread
Follow Ups
You can not post to an archived thread.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]