Aion Electronics ASTERIA MK. III 매뉴얼 - 페이지 2
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페이지 인쇄TABLE OF CONTENTS
1 Project Overview
2 Introduction & Usage
INTRODUCTION
The Asteria Preamp Drive Mk. III is an adaptation of the Catalinbread Formula 55, based on the Fender
5E3 Tweed Deluxe amplifiers from the 1950s. It was originally released in 2017, the third version of the
original Formula No. 5, but different enough that they changed the name.
The Formula 55 replicates the quirks of the original Deluxe amp, including a tone control whose effect
diminishes as the gain is turned up, with almost no change across the sweep at maximum drive. While
the original amp only had Gain and Tone knobs, this circuit adds a master volume, Presence control, and
a toggle switch to increase the gain.
Like several other Catalinbread pedals, this circuit blurs the line between a preamp and an overdrive.
Like a true preamplifier, it's very reactive to what comes before it, so it's best placed after other drive
pedals but before modulation. However, it also generates more than enough drive on its own and can be
used as a standalone overdrive pedal just like any other.
The Formula 55 was preceded by two versions of the Formula No. 5 in 2010 and 2011. These are
available from Aion FX as the
The original Formula 55 used MPF4393 JFETs, which are no longer produced. Aion FX sells the
MPF4393
in sets of 5. The PCB also has an extra pad so that surface-mount JFETs can be used (part
number MMBF4393), which are still in production and perform identically to those used in Catalinbread
pedals. See build notes for more details.
The Asteria Mk. III is compatible with the
circuit at 18V without an external adapter. The higher voltage provides increased volume and clarity.
USAGE
The Asteria Mk. III has the following controls:
• Volume controls the amount of gain in the first amplifier stage.
• Tone is a treble-cut control. Its function changes with the gain control position, and has no effect
with the gain all the way up.
• Presence is a treble-cut control at the end of the circuit.
• Master is the overall output level.
ASTERIA PREAMP DRIVE MK. III
Asteria Mk. I
and
Asteria Mk.
18V Voltage Doubler / Bypass module
10 Licensing
II.
original
if you want to run the
2