Mod Amber Manual

Mod® Electronics
Amber
Compressor
- for Hammond 1590B (also fits well in 125B/1590N1, Gorva C65)
The Mod® Amber is a JFET compressor based on the Dan Armstrong Orange Squeezer. It
Is a classic compressor effect with a fairly simple circuit topology, making for an easy and compact
build.
Bill of Materials:
Reference Value
C1 4u7
C2 4u7
C3 4u7
C4 100u
C5 47n
C6 47n
C7 4u7
C8 2n2
D1 1n34a
D2 1n5817
Q1 2n5457
Q2 2n5457
R1 390k
R2 390k
R3 1k5
R4 100k
R5 470k
R6 10k
R7 220k
R8 2k4
R9 390k
R10 470k
R11 82k
R12 1M
R13 470k
RV1 B10k
RV2 A10K
U1 RC4558
Copyright 2025 Mod Electronics
®
The Amber and Orange Squeezer "squish" your
guitar signal, which can provide smoother playing
dynamics and enhanced sustain. The Orange
Squeezer can be heard on classic songs by
Steely Dan, The Doobie Brothers, and Dire Straits
among others.
Controls:
• LEVEL
• BIAS (internal trim pot)
Package Type
Polarized electrolytic capacitor, 5mm
Polarized electrolytic capacitor, 5mm
Polarized electrolytic capacitor, 5mm
Polarized electrolytic capacitor, 6.3mm
Box film capacitor, 7.2 x 2.5mm
Box film capacitor, 7.2 x 2.5mm
Polarized electrolytic capacitor, 5mm
Box film capacitor, 7.2 x 2.5mm
Germanium diode, DO-7
Schottky diode, DO-204AL
JFET, TO-92
JFET, TO-92
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Vishay PR01 or generic 1/4W resistor
Bourns 3362P trimpot
16mm right angle PCM Alpha potentiometer
Dual op-amp, DIP-8
1 of 5
Electronics
SKU Notes
C-ETR4D7-50
C-ETR4D7-50
C-ETR4D7-50
C-ETR100-25
C-R82-47N
C-R82-47N
C-ETR4D7-50
C-R82-2N2
P-Q972
P-Q1N5817
P-Q2N5457
P-Q2N5457
R-PR01-390K
R-PR01-390K
R-PR01-1D5K
R-PR01-100K
R-PR01-470K
R-PR01-10K
R-PR01-220K
R-PR01-2K4
R-PR01-390K
R-PR01-470K
R-PR01-82K
R-PR01-1M
R-PR01-470K
R-VT62P-10K
R-VAM10KA-SS-PCL Level
P-QRC4558
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