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1590B · 1 knobs

Aion FX

Ares (Legacy)

Based on the Echoplex EP-3 Preamp· 1 other board clones it

Category
Preamp / Amp-in-a-box· Preamp, buffer
Controls
Volume
Difficulty
Easy
Price
see vendor

From the vendor

A pedal adaptation of the preamp section of the EP-3 Echoplex tape echo unit. It captures the sound of the EP-3 in bypass mode, favored by many guitarists for it “sweetening” effect on the tone.

The Ares Preamp is an adaptation of the preamp section of the Echoplex EP-3 tape delay first released in 1970. The Echoplex was a popular tape echo, but people noticed that even with the unit in bypass mode, it did wonderful things to a dry guitar signal.

Internally, it’s a fairly simple JFET boost, but it colors the tone in such a way that you really notice it when it’s off. It does provide a slight boost but it is primarily a tone-shaping tool.

The EP-3 circuit was modified slightly after serial #9450 to add a bypass capacitor to the FET stage. (There are a couple of other tweaks but this one has the biggest effect on the tone.) I made this capacitor switchable so you can easily choose between the two versions. On the other side of the switch is another much larger bypass capacitor that increases the boost potential and fattens up the signal.

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 40 rows

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RefValueNormalizedTypeNotes
Resistors 16
R1100k100k
R21M1M
R33k33.3k
R422k22k
R5220k220k
R6100k100k
R7470k470k
R8220k220k
R91M1M
R1010k10k
R1115k15k
R1222k22k
R13100k100k
R1460R60
R1011M1M
R1021M1M
Capacitors 14
C1220pF220p
C222n22n
C322n22n
C4100n100n
C5220pF220p
C622n22n
C7470n470n
C847uF47uelec
C9470n470n
C1010uF10uelec
C1110uF10uelec
C12470n470n
C1322n22n
C10147uF47uelec
Diodes 3
D21N58191N5819
D31N58191N5819
D11N4743 zener1N4743 ZENER
Transistors 2
Q12N54842N5484
Q22N54852N5485
ICs 1
IC1LT1054CPLT1054CP
Potentiometers 2
VOLUME500KBB500kPotentiometer
RPD1M1MPotentiometer
LEDs 1
LED1intoINTO
Other 1
X7RMLCCsMLCCS

Other boards based on the Echoplex EP-3 Preamp

  • Ares Aion FX · 125B · $12.50