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PROJECT NAME
BETA PREAMP
BASED ON
Sunn
®
Beta Lead / Bass
EFFECT TYPE
Preamp & high-gain drive
PROJECT SUMMARY
A single-channel pedal recreation of the Sunn® Beta Lead and Beta Bass amplifiers, unique in using
overdriven CMOS stages for their drive tone.
Actual size is 3.44" x 2.42" (main board) and 1.77" x 0.87" (bypass board).
BETA PREAMP
BUILD DIFFICULTY
Advanced
DOCUMENT VERSION
1.0.1 (2022-06-06)
1
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Related Manuals for aion BETA PREAMP
Summary of Contents for aion BETA PREAMP
- Page 1 PROJECT NAME BETA PREAMP BASED ON BUILD DIFFICULTY Sunn ® Beta Lead / Bass Advanced EFFECT TYPE DOCUMENT VERSION Preamp & high-gain drive 1.0.1 (2022-06-06) PROJECT SUMMARY A single-channel pedal recreation of the Sunn® Beta Lead and Beta Bass amplifiers, unique in using overdriven CMOS stages for their drive tone.
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Page 2: Table Of Contents
The Beta Preamp is a single-channel adaptation of the original amplifier. It can be built in either Bass or Lead configurations by swapping out a few components. While it can be used as a drive pedal, it works best as a true preamp driving a power amp directly. -
Page 3: Parts List
Lead value. Use 12k for Bass version. 100k Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Lead value. Use 180k for Bass version. Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W BETA PREAMP... - Page 4 Film capacitor, 7.2 x 5mm 10uF Electrolytic capacitor, 5mm 10uF Electrolytic capacitor, 5mm 100n MLCC capacitor, X7R 100n MLCC capacitor, X7R 100n MLCC capacitor, X7R 100n MLCC capacitor, X7R 100n MLCC capacitor, X7R 100n MLCC capacitor, X7R 100uF Electrolytic capacitor, 6.3mm BETA PREAMP...
- Page 5 16mm dual pot, right angle BASS 100kB 16mm right-angle PCB mount pot 100kB 16mm right-angle PCB mount pot TREBLE 100kB 16mm right-angle PCB mount pot LEVEL 100kA 16mm right-angle PCB mount pot Original uses linear taper (B), but audio taper works better. BETA PREAMP...
- Page 6 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. BYPASS 3PDT Stomp switch, 3PDT ENCLOSURE 1590BBS Enclosure, die-cast aluminum BETA PREAMP...
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Page 7: Build Notes
1590BB2, but we have not tested it, so you’re on your own! Another alternative is the 1590C (also available from Tayda and Love My Switches). It’s about 10mm taller than necessary, but if that’s all you can find then it will definitely work. BETA PREAMP... -
Page 8: Schematic
100n SHOWN WITH BETA LEAD VALUES BETA BASS VALUES: C14: 22n -> 56n C18: 4n7 -> 10n IC4A C19: 27n -> 47n R22: 10k -> 15k R23: 12k -> 27k R24: 22k -> 12k R27: 91k -> 180k BETA PREAMP... -
Page 9: Drill Template
-1.05, y: +1.71 x: +1.05, y: +1.71 ø9/32” ø9/32” BASS TREBLE x: 0, y: +0.31 ø9/32” x: -1.05, y: +0.31 x: +1.05, y: +0.31 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” BETA PREAMP... -
Page 10: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 1590BBS BETA PREAMP... -
Page 11: Wiring Diagram
WIRING DIAGRAM PGND NC OUT GND +V +V JACK GND JACK GND GND PCB BETA PREAMP... -
Page 12: Document Revisions
The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.1 (2022-06-06) Added note about enclosure size. Corrected link to Mouser parts spreadsheet. 1.0.0 (2022-06-03) Initial release. BETA PREAMP...
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