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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
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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
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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. |
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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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