Akashic Guitar effects circuit lookup
GAINBASSMIDTREBLEMASTER

Enclosure not stated · 5 knobs

Revolution Deux

Catalinbread RAH

Based on the Catalinbread RAH· 6 other boards clone it

Category
Overdrive
Controls
Gain · Bass · Mid · Treble · Master
Price
see vendor
Also as
Vero layout · from Revolution Deux
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org thread Vero layout

From the vendor

The Catalinbread RAH (Royal Albert Hall) is roughly the WIIO circuit, three cascaded BS170 stages with feedback from the last stage, retuned and given a three-knob Bass/Mid/Treble stack taken from the Hiwatt DR input preamp used by Jimmy Page. Very uncompressed, with a wide dynamic range.

Schematic

The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.

Parts list 51 rows

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Check before you build · 2 values the reader of this schematic was not sure of
  • The zeners Z1-Z3 have no value on the schematic; 9.1V per the vero layout, which also adds a 1N4001 reverse-polarity diode.
  • The pot tapers are from the schematic and layout: Gain B500K, Bass A500K, Mid B100K, Treble B250K, Master A250K.
RefValueNormalizedTypeNotes
Resistors 21
R1762K62kread from the schematic by eye
R18100K100kread from the schematic by eye
R11M1Mread from the schematic by eye
R121K1kread from the schematic by eye
R43.3K3.3kread from the schematic by eye
R73.3K3.3kread from the schematic by eye
R1022K22kread from the schematic by eye
R11220K220kfeedback; read from the schematic by eye
R21M1Mread from the schematic by eye
R53.3K3.3kread from the schematic by eye
R83.3K3.3kread from the schematic by eye
R21100K100kno designator drawn; read from the schematic by eye
R19100K100kread from the schematic by eye
R22220K220kno designator drawn; read from the schematic by eye
R2322K22kno designator drawn; read from the schematic by eye
R31M1Mread from the schematic by eye
R16130130read from the schematic by eye
R63.3K3.3kread from the schematic by eye
R93.3K3.3kread from the schematic by eye
R1410K10kread from the schematic by eye
R1510K10kread from the schematic by eye
Capacitors 19
C1047u47uelectrolytic; read from the schematic by eye
C1410u10uelectrolytic; read from the schematic by eye
C53.3n3.3nread from the schematic by eye
C122u22uelectrolytic; read from the schematic by eye
C7100n100nread from the schematic by eye
C2047p47pno designator drawn; across the Gain pot; read from the schematic by eye
C8680n680nfeedback; read from the schematic by eye
C447n47nread from the schematic by eye
C210u10uelectrolytic; read from the schematic by eye
C211n1nno designator drawn; read from the schematic by eye
C22220p220pno designator drawn; read from the schematic by eye
C1547n47nread from the schematic by eye
C1847n47nread from the schematic by eye
C231n1nno designator drawn; read from the schematic by eye
C6100n100nread from the schematic by eye
C322u22uelectrolytic; read from the schematic by eye
C11220n220nread from the schematic by eye
C122.2n2.2nread from the schematic by eye
C132.2n2.2nread from the schematic by eye
Diodes 3
Z19.1V zener9V1value from the layout; read from the schematic by eye
Z29.1V zener9V1value from the layout; read from the schematic by eye
Z39.1V zener9V1value from the layout; read from the schematic by eye
Transistors 3
Q1BS170BS170read from the schematic by eye
Q2BS170BS170read from the schematic by eye
Q3BS170BS170read from the schematic by eye
Potentiometers 5
GainB500KB500kPotentiometerread from the schematic by eye
BassA500KA500kPotentiometerread from the schematic by eye
MidB100KB100kPotentiometerread from the schematic by eye
TrebleB250KB250kPotentiometerread from the schematic by eye
MasterA250KA250kPotentiometerread from the schematic by eye

Other boards based on the Catalinbread RAH