|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
In Reply to: 71A schematic... posted by Vinnie on October 3, 2007 at 16:08:53:
I ran some numbers on the alternatives. I assumed rp of 44k per 6SL7 half, a book value I have seen in real life. I used the mu of 70, although I believe the 6SL7 samples I have tend to run low on mu. Operating point would affect this and I did not figure yours out when doing this.
Your 6SL7 set up: Gain of 28
Bypass the cathode resistor only: Gain of 48
Eliminate the 24uF capacitor between the two 47k resistors (increasing RL to 94000): Gain of 40
Both bypass Rk and eliminate 24uF: Gain of 56
I don't know how important the 24uF may be to limiting PSU noise and ripple, so maybe you compromise with more plate resistance but not the whole 94k, retaining a dropping resistor and the 24uF. Guys below suggest this.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Some gain calculations - Perseo 08:21:57 10/04/07 (1)
- RE: Some gain calculations - Pär 11:49:00 10/04/07 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
