4-4-0 Studio Amplifier Project
[classic projects]
[current version] [testing version] [old
versions]
Overview
The 4-4-0 Studio is a 2W, push-pull amplifier with a single channel
preamp. This amp is very responsive to the player and cleans up
will by just backing off on the guitar's volume. As with the
other Studio projects on AX84, should this amplifier be coupled to a
AX84 Core Cabinet loaded with an efficent 100dB or better speaker, and
then cranked to 10, it will make
your ears ring.
This project is intended for those who have built amps before.
The circuitry, while deceptively simple, yeilds an amp that is at the
threshold of stability, and as such, it is very sensitive to things such as
component choice and wire placement.
Tone goes from sparkling clean, to smoothly overdriven, to
semi-saturated distortion, depending on
pick attack and guitar volume setup. Responds very well to common
pedals yet still and
retains your guitars tone.
Features
- 3 stage hi-gain 12ax7 based preamp.
- Bass, Mid, and Treble tone controls.
- 12AX7 long-tailed pair type phase splitter.
- Complete NFB loop that includes a Presence control.
- 6SN7GTB dual triode in class AB push-pull configuration providing
approximately 1W of power clean, and 2W at full tilt.
Skill Level: intermediate --- Status: Ready to
Build.
Before using these materials, please read our terms
and conditions.
4-4-0
Studio 10.02.16
|
Schematic, bill of materials, board template and chassis
layout for the 10.02.16 version of the AX84 4-4-0 ~ Studio.
|
BrianS_4-4-0.mp3
|
Brian Schmittling's build.
This is what we mean by clean to
distorted with the twist of your guitar's volume. 8-)
|
TomN_4-4-0_Clean.mp3
|
Alan Olson's build, Guitarist Tom Northfield
with a PRS Guitar. These clips are clean with the 4-4-0 setup as
follows:
Vol=4, TMB=544, Pres=6, Bright=Low. The cabinet is an Avatar 1x12
closed back with a Celestion G12H30 |
| TomN_4-4-0_Clean2.mp3 |
Alan Olson's build, Guitarist Tom Northfield
with a PRS Guitar, and the cabinet is an 4x12 closed back with a
Celestion Blues. |
TomN_4-4-0_Crunch.mp3
|
Alan Olson's build, Guitarist Tom Northfield
with a PRS Guitar. These clips are dirty with the 4-4-0 setup as
follows:
Vol=9, TMB=544, Pres=8, Bright=High. The cabinet is a Marshall 2x12
closed back with stock speakers. |
| TomN_4-4-0_Crunch2.mp3 |
Alan Olson's build, Guitarist Tom Northfield
with a PRS Guitar. These clips are dirty with the 4-4-0 setup as
follows:
Vol=8, TMB=345, Pres=8, Bright=Low. The cabinet is an Avatar 1x12
closed back with a Celestion G12H30. |
| JonA_4-4-0.mp3 |
Jon Anderson's clip of Alan Olson's build at the
Minnesota Amp Fest.
|
Is this area looking a little skimpy? Looking for older materials
and
soundclips from previous version? Check out [the
older versions]
