BIRTH OF A NEW AX84 HIGH OCTANE TUBE AMPLIFIER
(
click on any photo for A larger picture)


This page details the construction of an AX84 High Octane style amplifier: www.ax84.com

Features

  • Hi-Gain 12ax7 Preamp

  • 6BQ5/EL84/SV83 Power Tube in Class-A Single Ended Configuration provides a surprisingly loud 5 watts or so of output power

  • Cathode-follower driven Bass, Mid and Treble tone controls allow you to shape your sound. Alter the values of the components in the tone stack to tailor your sound.

Many thanks to Ramiro Silva for his excellent construction web page with plans, photos, the works. Ramiro is a gifted amp builder with extraordinary attention to detail.

See his amps website here:  www.silvatone.bravepages.com


CONSTRUCTION: PAINTING THE CHASSIS

 

February 16, 2006 (1 Hour)
Cumulative build time, 14 hours

The chassis really looked nice polished, but I designed this build to be gloss white. I used Rust-Oleum primer and white gloss coat. The results are pretty good. Will need a good wax to look its best.

First step was to thoroughly clean and degrease the chassis with acetone, followed by a soap and water wash/rinse. Then I built an elaborate "paint booth" out of sawhorses, a clay pot and a box lid.

Here is the chassis after painting with Rust-Oleum Clean Metal Primer: White Clean Primer #7780. The result is a nice flat white finish. I let that dry for 48 hours, then lightly sanded the finish to prepare for the gloss coat.

BEFORE: The chassis was a brilliant, shining beauty. However, this build is destined for a gloss white finish. I'll miss that mirrored surface! Don't cry for the lost shiny chassis; I'll build a polished version in the future.

AFTER: After a light sanding of the primered chassis, I finished it off with Rust-Oleum High Performance Enamel: Gloss White #7592. Got a little dark and cloudy, so this photo is a bit dank. You'll have to take my word for it that the gloss white finish looks creamy. It will look even better after waxing and buffing.

ONE LITTLE MISTAKE = LOTS OF EXTRA WORK!

I'm sure the Rust-Oleum folks would cringe, but I decided to accelerate the drying process a bit by placing the chassis on a heating pad. This works GREAT...UNLESS...you place the paint in direct contact with the heater. With the pad under the chassis, all was right with the world. However, when I turned the piece upside down, the excess heat forced out thousands of tiny bubbles, marking the paint with an interesting heater wire pattern. I didn't have the heart to show the BEFORE photo, but it wasn't pretty.

Thankfully rubbing compound, followed by polishing compound and a good wax and buff brought out a nice shine. As always, having the right tool made things much easier. I used a little power hand sander on top of cheap buffing pads to restore the finish. The above photo is a little tickler for the next build page: Wiring the Chassis.


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HEY! GET OFF MY PAINT!


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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