Home Tube DIY Asylum

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

[ Follow Ups ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]
[ Alert Moderator ] [ Edit ] [ Delete ]

Re: Hum pot in DHT preamp ???

212.185.252.197

Hi!

> did you ever consider connecting the bias resistor to the positive > side... this will buy you some extra bias
> voltage, and allow for a slightly smaller resistor for the same

I'm not sure if I understand what you mean by this,
but with the filament bias approach this wouldn't work.
With filament bias, the filament itself is actually a
substantial part of the bias resistor.


> i assume since you are using it, you like the sonic results of > the bias resistor :-)

Im my 801 linestage the bias resistor is only 33 Ohms.
I still use the ultrapath connection. The B+ side of
the lineout transformer is returned to the - side of
the filament. So the AC signal actually bypasses the
bias resistor (at least from the midrange on upwards)

Thomas

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

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

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]