Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]
[ Alert Moderator ]

Okay

Signal enters the grid of V5A on pin 4 and the amplified, and inverted, signal exits C16 and goes to drive V6's grid . R29 and R30 form a voltage divider so that we "pick off" a part of that signal and route it to the grid, pin 1, of V5B. V5B amplifies that and also inverts it so that V7's grid, through C17, sees a mirror image of the same amplitude as V6's did.

But notice that only V7's input signal has gone through V5B and balance depends upon the sections of the 6SN7.


Oh, the 30pF cap "rolls off the highs" of the V5A. Typically it is sized to work with the feedback loop. Don't worry about it (now) as it would depend on the parts used as well as the "layout".

Take your time and I understand all this may be Greek to you. I'd encourage you to look up "long tailed pair" and "Hedge cascode". As they say, measure twice and cut once:) I have heard the Seth, which is mentioned above, and it is another way to skin the cat. Sadly, there is no right/best way in audio. At best one can say something is perhaps "the wrong way" and even that is open to debate (often). I know this is frustrating and all I can offer is that many times more is learned by failure than success. Big help huh:)



Russ

This post is made possible by the generous support of people like you and our sponsors:
  Kimber Kable  

Follow Ups Full Thread
Follow Ups
FAQ

Post a Message!

 Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.

[ 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 ]