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Wampler Tweed '57

Based on the Wampler Tweed '57· 6 other boards clone it

Category: Overdrive
Controls: Volume · Gain · Bass · Mids · Treble
Price: see vendor
Tags: freestompboxes.org trace

Read the post at Revolution Deux Schematic image PCB layout

From the vendor

A JFET amp-in-a-box inspired by mid-to-late-1950s tweed Fender amps, the follow-up to Wampler's Black '65. A J201 input stage feeds a paralleled-J201 gain stage, a Fender style Treble/Bass/Mids tone stack, a second paralleled-J201 recovery stage and a J201 output buffer. An Input Simulator switch picks Normal, Bright or Linked inputs, emulating the jumpered channels of a tweed amp.

Schematic

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

Parts list 61 rows

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Check before you build · 2 values the reader of this schematic was not sure of

The two JFETs in the recovery stage are drawn overlapping and read as Q5 and Q6; there is no Q7 on the drawing.
The 0.0022 (2.2n) treble cap's designator overlaps the Treble pot label; read as C8, which matches the PCB layout.

Ref	Value	Normalized	Type	Notes
Resistors 28
R1	1M	1M		read from the schematic by eye
R2	12K	12k		read from the schematic by eye
R3	1M	1M		read from the schematic by eye
R4	1K	1k		read from the schematic by eye
R5	16K	16k		read from the schematic by eye
R6	10K	10k		LED resistor; read from the schematic by eye
R7	1M	1M		read from the schematic by eye
R8	10K	10k		read from the schematic by eye
R9	10K	10k		read from the schematic by eye
R10	1M	1M		read from the schematic by eye
R11	1M	1M		read from the schematic by eye
R12	100K	100k		read from the schematic by eye
R13	5.6K	5.6k		read from the schematic by eye
R14	22K	22k		read from the schematic by eye
R15	1K	1k		read from the schematic by eye
R16	68K	68k		read from the schematic by eye
R17	1K	1k		read from the schematic by eye
R18	22K	22k		read from the schematic by eye
R19	10K	10k		read from the schematic by eye
R20	10K	10k		read from the schematic by eye
R21	22K	22k		read from the schematic by eye
R22	1M	1M		read from the schematic by eye
R23	10K	10k		read from the schematic by eye
R24	4.7K	4.7k		read from the schematic by eye
R25	10K	10k		read from the schematic by eye
R26	3.3K	3.3k		read from the schematic by eye
R27	100K	100k		read from the schematic by eye
R28	100	100		read from the schematic by eye
Capacitors 17
C1	470p	470p		read from the schematic by eye
C2	100n	100n		read from the schematic by eye
C3	47u	47u		electrolytic; read from the schematic by eye
C4	1u	1u		read from the schematic by eye
C5	220n	220n		read from the schematic by eye
C6	220n	220n		read from the schematic by eye
C7	220n	220n		read from the schematic by eye
C8	2.2n	2.2n		read from the schematic by eye
C9	220n	220n		read from the schematic by eye
C10	47u	47u		electrolytic; read from the schematic by eye
C11	22u	22u		electrolytic; read from the schematic by eye
C12	1u	1u		read from the schematic by eye
C13	1.5n	1.5n		read from the schematic by eye
C14	1.5n	1.5n		read from the schematic by eye
C15	1.5n	1.5n		read from the schematic by eye
C16	100p	100p		read from the schematic by eye
C17	220u	220u		electrolytic; read from the schematic by eye
Diodes 1
D2	1N914	1N914		read from the schematic by eye
Transistors 8
Q1	J201	J201		read from the schematic by eye
Q2	J201	J201		read from the schematic by eye
Q3	J201	J201		read from the schematic by eye
Q4	J201	J201		read from the schematic by eye
Q5	J201	J201		read from the schematic by eye
Q6	J201	J201		read from the schematic by eye
Q8	2N3904	2N3904		read from the schematic by eye
Q9	2N3906	2N3906		read from the schematic by eye
Potentiometers 5
Volume	A100K	A100k	Potentiometer	read from the schematic by eye
Gain	A500K	A500k	Potentiometer	read from the schematic by eye
Bass	A100K	A100k	Potentiometer	read from the schematic by eye
Mids	B2K	B2k	Potentiometer	read from the schematic by eye
Treble	B25K	B25k	Potentiometer	read from the schematic by eye
Switches 1
Input	3-position	3-POSITION		Normal / Bright / Linked; read from the schematic by eye
LEDs 1
D1	LED	LED		3mm; read from the schematic by eye

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