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AX84 P1-eXtreme Tube Guitar Amplifier Project

[classic projects] [current version] [testing version] [old versions]

Overview

The P1 eXtreme is an evolution of the P1 amplifier which pushes the original design out to the limits and part way into HO territory, while keeping the essential simplicity of the original P1,with the idea of seeing see how far you could go with just two tubes.

It does this by increasing the preamp gain, with the preamp voiced for optimum signal swing and distortion, adding a master volume control and then an octal power tube running at higher rail voltages for a bigger sound.

One of the great features of this amp is the way the sound can be varied on the Gain control between clean to edge of breakup, mild bluesy P1-style overdrive, and on to full classic M@rsh@ll-style crunch. With hot humbuckers or a boost pedal and the gain control cranked, you can even get metal sounds.

Features

  • High voltage-gain, specially voiced preamp provides rich preamp distortion and drives output tubes hard
  • Can be used with most octal power tubes, including 6L6, 6V6, EL34, KT66, KT88, 6550 for fatter tone. Just adjust bias resistor and output load impedance to suit. The bigger tubes can provide giggable volume levels.
  • Gain and Master Volume controls for a wide range of tones and sound levels, with variable proportions of preamp and power amp distortion
  • Similarity to regular P1 means that it can be built using any common P1 layout, with only a few minor differences to take into account

Skill Level: beginner --- Status: Ready to Build.

Before using these materials, please read our terms and conditions.


Current Materials

10.10.04 P1-eXtreme Schematic, board template and chassis template for the 10.10.04 version of the AX84 P1-eXtreme.
10.10.04 P1-eXtreme Options Guide
This document contains user options for the P1eXtreme project.
P1-eXtreme Theory Document The P1eX Theory Document - by Stephen Keller (updated form the original P1 Theory document by David Sorlein), version 10.2.15.
Builders Guide The Builders Guide document for single-ended AX84 projects


Older Version Materials

10.06.16 P1-eXtreme Schematic, board template and chassis template for the 10.06.16 version of the AX84 P1-eXtreme.
08.06.23 P1-eXtreme
Schematic, board template and chassis template for the 08.06.23 version of the AX84 P1-eXtreme.

Beta 3 (Final)

08.05.07 P1-eXtreme Schematic, bill of materials, board template and chassis layout for the 08.05.07 version of the AX84 P1-eXtreme.
08.05.07 Chassis 1 Drill Plan
Drill guide for the P1, Hi-Octane, P1-eXtreme, SEL, and October ~ Studio projects 16" x 8" x 2" chassis.
08.04.10 P1 Options Guide
This guide contains AX84 options for the P1 amp.

Beta 2

08.04.10 P1-eXtreme Schematic, bill of materials, board template and chassis layout for the 08.04.10 version of the AX84 P1-eXtreme.
08.04.10 Chassis Drill Plan
Drill guide for 16" x 8" x 2" chassis.
08.04.10 P1-eXtreme Options Guide
This guide contains AX84 options for the P1-eXtreme amp.

Beta 1

08.03.13 P1-eXtreme Schematic, board template and chassis template for the 08.03.13 version of the AX84 P1-eXtreme.
06.03.16 P1-eXtreme Schematic, board template and chassis template for the 06.03.16 version of the AX84 P1-eXtreme.

Previous Release

05.11.23 P1-eXtreme Schematic, board template and chassis template for the 05.11.23 version of the AX84 P1-eXtreme.

Is this area looking a little skimpy? Looking for older materials and soundclips from previous version? Check out [the older versions]


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