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AX84 October Tube Guitar Amplifier Project

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

Overview

The October series are all push-pull guitar amp that use a variety of tubes for different amounts of output power.  The Studio version uses a 6SN7GTB dual triode and has an output power of 2 watts.  The Club version uses a pair of 6V6 beam pentodes and has an output power of 20 watts.  The Stage version uses a pair of beam tetrodes and produces 50 watts of power.  The Stage version's output power can be reduced by using KT66's or 6V6's instead of the KT77's.

The preamp has two seperate bright and dark channels that can be mixed, via individual volume controls, for a wide range of tones. Additionally, the two preamp channel's character can be changed via a switch, from a late 60's - early 70's "looser and smoother" sound to a late 70's - early 80's "brighter and tighter" sound.

The October has a traditional "TMB" tone stack and a pre-PI master volume control so that the user can control the overall output of the preamp signal.

The power tubes have individual bias pots to allow tube sets to be used longer. Folks that like the sound of a little mis-match between power tubes can dial in the exact amount they want. The October also includes external test ports and bias pots so that the bias can be checked, and adjusted, without opening the amp.

By far, credit for the best description of the October must go to Jon Anderson:

It's got 3-4 decades worth of tones in it. I just recently added my 'Bassman Mod' to mine. Basically a pot on the NFB so it ranges from JTM45 style NFB to a more subtle Bassman amount.

  1. 1950s: '59 Bassman : Hook up some alnico/jensen speakers to it, crank down the NFB, flip switch to 'Plexi', and plug in a Tele. Start your chicken pickin'
  2. 1960s: Crank up the NFB, leave the switch, plug in some greenbacks. Maybe add a RangeMaster, plugging into the Normal Channel. Grab your 1960 Les Paul Gold Top with PAFs and start playing 'Hideaway'.
  3. 1970s: Flip the switch to 'Ali'. Crank everything up to 6-8, back off the NFB to about 5, hook up some G12H30's, and start playing 'All Right Now' with your LP.
  4. 1980s: Grab your super strat, EQ and Delay pedals, crank it up to 10 all around. Probably need a bit of a boost in front as well, but becareful it doesn't start an Eruption.

Features

  • Seperate, bright and dark preamp stages.
  • Modern/Vintage preamp voicing switch.
  • Variable NFB control.
  • Individual power tube bias controls.
  • Bass, Mid and Treble tone controls.

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

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

October ~ Club Birthday Edition

10.10.10 October ~ Club A special edition of the October Club in honor of it's 8th birthday, from a time when things were less complicated.


October ~ Studio Current Materials

10.03.25 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 10.03.25 version of the AX84 October ~ Studio.
Studio Chassis Drill Guide 10.01.28 Chassis drill guide for the Studio amps version 10.01.28.
oct_studio_blackbird_etc.mp3
October Studio Clean Sound Clip by Jon Anderson
oct_studio_wet_vh01.mp3
October Studio Crunchy Sound Clip 1 by Jon Anderson
oct_studio_wet_vh02.mp3
October Studio Crunchy Sound Clip 2 by Jon Anderson
october-studio-prs.mp3
Jon Anderson's 4W October Studio through a 4x12 with Celestion Blue's (the guitar is a PRS)
october-studio-lp.mp3
Jon Anderson's 4W October Studio through a 4x12 with Celestion Blue's (the guitar is a Les Paul Gold Top)

Older Versions:


10.03.22 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 10.03.22 version of the AX84 October ~ Studio.
10.01.28 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 10.01.28 version of the AX84 October ~ Studio.
09.05.26 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 09.05.26 version of the AX84 October ~ Studio.
09.01.08 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 09.01.08 version of the AX84 October ~ Studio.
08.11.15 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.11.15 version of the AX84 October ~ Studio.
08.10.22 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.10.22 version of the AX84 October ~ Studio.
08.10.06 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.10.06 version of the AX84 October ~ Studio.
08.08.03 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.08.03 version of the AX84 October ~ Studio.
08.06.25 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.06.25 version of the AX84 October ~ Studio.
08.06.01 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.06.01 version of the AX84 October ~ Studio.
08.05.21 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.05.21 version of the AX84 October ~ Studio.
08.05.19 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.05.19 version of the AX84 October ~ Studio.
08.05.07 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.04.25 version of the AX84 October ~ Studio.
08.05.07 Chassis 1 Drill Plan AX84 Chassis 1 Drill guide for 16" x 8" x 2" chassis.
08.04.25 October ~ Studio Schematic, notes, bill of materials, board template and chassis layout for the 08.04.25 version of the AX84 October ~ Studio.


October ~ Club Current Materials

09.05.19 October ~ Club Schematic, bill of materials, board template and chassis layout for the 09.05.19 version of the AX84 October ~ Club.
08.05.12 Chassis 2 Drill Plan AX84 Chassis 2 Drill guide for 16" x 8" x 2" chassis.

Older Versions:


09.01.08 October ~ Club Schematic, bill of materials, board template and chassis layout for the 09.01.08 version of the AX84 October ~ Club.
08.08.03 October ~ Club Schematic, bill of materials, board template and chassis layout for the 08.08.03 version of the AX84 October ~ Club.
08.06.16 October ~ Club Schematic, bill of materials, board template and chassis layout for the 08.06.16 version of the AX84 October ~ Club.
08.06.08 October ~ Club Schematic, bill of materials, board template and chassis layout for the 08.06.08 version of the AX84 October ~ Club.
08.06.05 October ~ Club Schematic, bill of materials, board template and chassis layout for the 08.06.05 version of the AX84 October ~ Club.
08.05.12 October ~ Club Schematic, bill of materials, board template and chassis layout for the 08.05.12 version of the AX84 October ~ Club.
07.10.04 October Club Schematic, notes, BOM, board template, chassis layout, and template for the 07.10.04 version of the AX84 October (note that at the time these documents were done there was only one October project, not three, so the documents are just labled "October" and not "October ~ Club").
07.10.04 October ~ Club Build Guide
This is a build guide showing the construction of the October ~ Club prototype many moons ago.
October Club Sound Clip
AVI file of the October ~ Club featuring guitar virtuoso Chris Hurley.


October ~ Stage Current Materials

09.05.01 October Stage
Schematic, bill of materials, board template and chassis layout for the 09.05.01 version of the AX84 October ~ Stage.



Older Versions:


08.04.10 October Stage Schematic for the 08.04.10 version of the AX84 October ~ Stage



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

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


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