|Launched June 20, 2001. last updated 29 April, 2002. (new music links)
Build the "Li'l 4x4"
A Quest for Hi-Fi Audio from Lo-Fi Parts
This site best viewed at 800x600 resolution or better
"Li'l 4x4" is a self-contained, 4-stage, 4-watt general-purpose tube amplifier circuit with
a wide range of applications. It uses relatively inexpensive parts in an op-amp style topology to give
superior performance compared to traditional circuits using such components.
Possible applications include:
Some experience with vacuum tubes is recommended, but the project is sufficiently uncomplicated to be suitable as an intermediate project before tackling larger or more complex amplifier designs. The first preamplifier stage may be omitted if instrument-level sensitivity is not required (as for a centre-channel amplifier, etc.)
This article details my quest for the "perfect" low-power instrument amplifier, and includes a side-by-side comparison with an authentic classic design using similar components.
A new addition (July 2001) is a very simple yet effective compressor option, intended mainly for use with electric guitars.
|Demo recording available here
All contents of this website, including schematics, text, diagrams and photographs
are Copyright ©2001 by Fred Nachbaur, Dogstar Music. All rights reserved.
This site may be freely linked, but none of the contents may be posted anywhere else without
express permission of the copyright holder.
The information presented here may be used for personal, non-commercial use only. Any commercial applications of this design or any part thereof requires previous licensing arrangements with the author and copyright holder, Fred Nachbaur.
2: How It Works
4: Building the Li'l 4x4
5: Compressor Option
6: Parts List
Following is a listing of available resources for building the "Li'l 4x4". Included are
a full-size schematic and off-site parts resources.
|Full Schematic Diagram (7.5"x10" @ 300 dpi)
|An excellent site for tubes and related parts
|Good quality transformers
|You may contact me regarding this project at email@example.com. I'd be happy to hear from you, and any bug reports or suggestions for improvement are always welcome.
|To find out what other kinds of trouble I get into, check out my sites listed below:
Back to Tube Projects Main Page
My main Dogstar Music site
Fred's ZX81 retro computer page
My Theremin Exploits
Original music on IUMA.com
... and on Soundclick. Nice bio.