|
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: RE: Heaters in series? posted by Caucasian Blackplate on August 6, 2017 at 19:22:32:
Not everything is immediately evident in this schematic. Filament power and the negative bias supply come from switch mode supplies. Also note the use of mercury vapor rectifier in the power supply which has a large switchable dropping resistor, not sure how this can prevent arcing before the tube has warmed up.
Well I have built my own version and to my ears it sounds excellent.
Filament supply uses an LED supply rated 20 volts, 1.25 amps with a fixed 4 ohm resistor. I have two 25 watt 6 ohm pots if you are interested. The input tube biases up to 170 volts @10 ma. I omitted the VR tube. The output stage uses my own conventional negative supply and with -25 volts I get 20 ma current @ 355volts. Its dead quiet, no discernable noise, and sounds great. Of course the fact that it makes any kind of noise at the end of the day is a constant source of amazement and pleasure for me :)
Regards
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Heaters in series? - vetmedrobert@gmail.com 20:41:36 08/06/17 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
