|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
|
|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
In Reply to: seriously, think about a CCS on each splitter-driver posted by Timbo in Oz on September 27, 2006 at 15:33:57:
I second that.In my Mc240, I removed the positive feedback (C9, 10, 19, 20) from the cathodes of the 6L6's to the cathodes of the 12AX7's, and replaced the cathode resistors of the AX7's (R28, 29 and so forth) with 1mA FET CCS from Siliconix. I also added a pot between the plates of the phase inverter (12AU7's) for AC balance. The sound became more relaxed
But the biggest improvements were from increasing the power supply capacitance and moving the bias toward class AB: that removed the hard, transistor-like edge (from cross-over distortions) I found offending.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: seriously, think about a CCS on each splitter-driver - Zung 11:49:25 09/28/06 (3)
- yeah, you can get away with a good deal less NFB with A CCS on small signal tubes in diff'l - more so with - Timbo in Oz 19:56:07 09/30/06 (2)
- Should I bother to do the calculations, on the triode connected amp? - Timbo in Oz 14:54:35 10/04/06 (0)
- Triode-connecting a Mac? - Zung 08:37:57 10/01/06 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
