Akashic Guitar effects circuit lookup
GAINVOLUMETREBLEBASS

1590BB · 4 knobs

TH Custom Effects

Tube Driver1590BB

Based on the Chandler Tube Driver· 2 other boards clone it

Category
Overdrive
Controls
Gain · Volume · Treble · Bass
Price
€14.55in stock
Buy the PCB at TH Custom Effects Build document2.0

From the vendor

Great tone — better than ever. Cascaded op-amp clipping feeds a genuine 12AT7 tube stage, running at 60V from a self-contained charge pump. Fits in a standard 1590BB on a single pedalboard supply. The Tube Driver V2.0d is a faithful recreation and improvement of one of the most celebrated tube overdrive circuits ever made — used by David Gilmour, Eric Johnson, Joe Satriani and many others. Where the original had limitations, this design fixes them: the plate voltage is raised to ~60V (from a self-contained charge pump), the heater runs on 6V for compatibility with standard 9V pedalboard supplies, and the tone control has been upgraded to a Baxandall shelving network for much more musical bas

Schematic

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

Parts list 51 rows

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RefValueNormalizedTypeNotes
Resistors 20
R12k72.7k40106 oscillator timing
R31k1k
R81k1k
R141k1k
R41M1MInput pull-down / VR reference
R171M1MInput pull-down / VR reference
R547k47kTube plate loads + cathode bias
R647k47kTube plate loads + cathode bias
R947k47kTube plate loads + cathode bias
R722k22k
R2422k22k
R1010k10k
R1110k10k
R1210k10k
R1310k10k
R1510k10k
R1610k10k
R2310k10k
R182k22.2kOptocoupler drive current limit
R21100k100kTone stack spine
Capacitors 15
C847n47nRated 80–100V minimum (HV multiplier caps C1–C8)
C1047n47nRated 80–100V minimum (HV multiplier caps C1–C8)
C1147n47nRated 80–100V minimum (HV multiplier caps C1–C8)
C1647n47nRated 80–100V minimum (HV multiplier caps C1–C8)
C71n1nBox film
C281n1nBox film
C301n1nBox film
C1347p47pCeramic
C1747p47pCeramic
C1533n33nBox film. C19 is the main tone character modifier — see Stage Analysis
C1933n33nBox film. C19 is the main tone character modifier — see Stage Analysis
C22100n100nMLCC 5mm
C234n74.7nBox film
C296n86.8nBox film — Baxandall bass network
C3110n10nBox film — Baxandall treble network
Diodes 1
D8BAT85 / BAT43BAT85 / BAT43Schottky — relay flyback protection
Transistors 1
Q1BC549BC549TO-92 NPN. Pin-compatible: BC547 2N3904 . Verify CBE pinout per device.
ICs 5
IC140106N40106NDIP-14 — Hex Schmitt trigger. Use socket.
IC2uA7806UA78066V linear regulator for tube heaters. Switched regulator module also supported — see build notes. Mount to enclosure as heatsink if using linear type.
IC3TL072IPTL072IPDIP-8. Use socket. JRC4580D OPA2134 are pin-compatible alternatives.
REG178L05ACZ78L05ACZTO-92 — 5V regulator for PIC and relay logic
IC5PIC10F202PIC10F202DIP-8 PIC microcontroller — supplied pre-programmed for relay switching
Opto 1
OC1CPC1017NCPC1017NSO-4 SMT optocoupler — solder first, before any through-hole parts. See build guide.
Potentiometers 4
GAINA100kA100kAlpha 9mm. European convention: A taper = logarithmic.
VOLUMEA100kA100kAlpha 9mm. European convention: A taper = logarithmic.
TREBLEA100kA100kAlpha 9mm. European convention: A taper = logarithmic.
BASSA100kA100kAlpha 9mm. European convention: A taper = logarithmic.
LEDs 1
LED13mm super-bright3MM SUPER-BRIGHTTube illumination / bypass indicator
Jacks & sockets 1
S1Noval SocketNOVAL SOCKET9-pin PCB-mount Noval socket on sub-PCB
Other 2
V112AT712AT7Noval 9-pin. ECC81 = direct equivalent. 12AX7/ECC83 is pin-compatible but higher gain — see Stage Analysis.
K1FTR-B4CA4.5ZFTR-B4CA4.5ZDPDT relay 4.5V coil. Omron G6K-2F-Y-DC5 is an alternative.

Other boards based on the Chandler Tube Driver