www.sopht.ca
Jeff
Duntemann's 12Volt tube page
The Sopht Amp was proposed on the AX84 site by Stephane. His first post was a preliminary schematic for a low volume amp that he requested comment upon. Being very close to the one year point of picking up a soldering iron and having focused on low volume/ low voltage amps, I felt it would be a fine project. I was aware of the "space charge" tubes, but had never tried them. Within days I ordered the tubes and began learning more about their specs. I created a couple of spice models to be used to model the amp before I built it - this something I really enjoy, regardless of its accuracy. Any comment/suggestions to improve the tube model(s) is appreciated.
Some of the things that attracted me to this amp as well as low voltage tube amp design.
- Amp can easily be brought up on batteries during the initial wiring tests (cheap)
- Can use off the shelf power supplies- from wall warts to old PC PSU units (free)
- Low tolerance requirement of the components make it easy to scrounge parts from junk equipment (free)
- Can use low cost 70V line transformer for OT (cheap)
- Something different! (-huh?)
 |
My Design Goals
-Click image to see large |
|
|
|
||
 |
||