Akashic Guitar effects circuit lookup
GAINBASSMIDSTREBLEVOLUME

1590B · 5 knobs

Tagboard Effects

AMT B1 LegendVerified

Based on the AMT B1 Legend

Controls
Gain · Bass · Mids · Treble · Volume
Build
Vero· 23×11· 14 cuts, 1 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Amp Emulation, Distortion

From the post

And so on to the next AMT pedal, this one is based on the Bognor Triple Giant Sharp Channel. I've included trimmers with this one to help bias the alternative JFETs so this may be a better one to start with if you're interested in building an AMT pedal. I haven't included the cab sim, but you should be able to use the one shown in the AMT S1 layout. At 23 columns wide it will only fit in a 1590B vertically, but I wasn't too bothered about keeping the size down with this one because I think most people would want to put a 5 knob effect in a 1590BB size box.

Info from AMT about the original:

The B1 Legend Amp Series pedal, superior high gain quality distortion, as found in the Bogner Sharp Channel Amplifier*. The sound of the AMT B1 is monstrous in tone, aggression, and provides massive amounts of gain. Thunderous lows, screaming highs, and scoopable mids leave you with unbeatable heavy distortion sounds. This one could be the "kick" your guitar rig has been needing.

• The AMT Legend Amp Series guitar pedals provide excellent dynamics, nuances, and characteristics similar to that of tube driven amplifiers. • Tube-like range of volume control provides great sound density, playability, and power when playing at full volume and also in conjunction with your guitars volume knob. • TRUE BYPASS. The preamps of the Legend Amp Series pedals use passive true bypass circuitry, therefore no loss of guitar signal is noticed in your pedal chain. Similar to if no pedal was there at all when bypassed. • Features high level of output signal (+10dB in extreme position of Level knob) corresponds to the output levels similar of tube preamps. Thus, you have adjustable signal level allowing to hook up your preamp AND direct input of a power amplifier. • Controls include LEVEL, GAIN, LOW, MID, and HIGH. • TWO signal outputs: DIRECT AMPLIFIER OUT for guitar amplifier use and CAB SIMULATION OUT for mixer, or studio use.

Update 1: The person who prepared the schematic has posted that he has noticed an issue and he needs to correct it, so hold off on making this until we can get some confirmation of the scheme it is based on.

Update 2: I will do a new B1 vero layout based on the corrected schematic, but in the meantime if you have started building this version, you can complete it by using the daughterboard shown below:

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 34 rows

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RefValueNormalizedTypeNotes
Resistors 12
×1330R330read from the layout by eye
×16K86.8kread from the layout by eye
×147K47kread from the layout by eye
×12K2kread from the layout by eye
×11M1Mread from the layout by eye
×1270K270kread from the layout by eye
×1510R510read from the layout by eye
×2220K220kread from the layout by eye
×1470R470read from the layout by eye
×1390K390kread from the layout by eye
×1680R680read from the layout by eye
×124K24kread from the layout by eye
Capacitors 9
×1100u100uelectrolytic; read from the layout by eye
×347u47uelectrolytic; read from the layout by eye
×21n51.5nread from the layout by eye
×1470n470nread from the layout by eye
×1330n330nread from the layout by eye
×110n10nread from the layout by eye
×1100n100nread from the layout by eye
×247n47nread from the layout by eye
×1510p510pread from the layout by eye
Diodes 3
D1BAT41BAT41or similar Schottky; read from the layout by eye
D2BAT41BAT41or similar Schottky; read from the layout by eye
D3BAT41BAT41or similar Schottky; read from the layout by eye
Transistors 4
Q12N54582N5458JFET; read from the layout by eye
Q2J201J201JFET; read from the layout by eye
Q3J201J201JFET; read from the layout by eye
Q4J201J201JFET; read from the layout by eye
Potentiometers 5
GainC50KC50kPotentiometerread from the layout by eye
BassA500KA500kPotentiometerread from the layout by eye
MidsB10KB10kPotentiometerread from the layout by eye
TrebleB100KB100kPotentiometerread from the layout by eye
VolumeA500KA500kPotentiometerread from the layout by eye
Trimmers 1
×320K20kJFET bias, replacing 12K fixed resistors; read from the layout by eye