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1 Project Overview

2 Introduction & Usage

5-6 Usage

INTRODUCTION

The Beta Preamp is based on the Sunn® Beta Bass and Beta Lead amplifiers, first released in 1979.

The guitar and bass models were identical except for a handful value changes that made the EQ more

suitable for the frequency range of each instrument.

The Beta amps were unique in that they used overdriven CMOS gain stages for their drive tone. This

had been previously pioneered by Craig Anderton for his

Harmonix released their

this method had been used in an amplifier.

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.

The original Beta amplifiers ran on +/-15V, but in this adaptation the supply voltage has been reduced to

+/-9V so it can be powered conveniently by a standard 9V supply. In the original amp, the drive tone is

generated by CMOS hex inverters run on a reduced 8V single-supply, so the heart of the distortion tone

remains exactly like in the original amplifier. All of the other active components will perform the same on

the slightly reduced voltage since there is a great deal of of headroom either way.

USAGE

The Beta Preamp has five controls:

• Drive controls the amount of gain going into the overdriven CMOS stages.

• Treble, Mid and Bass form a 3-band active tone stack. The Lead and Bass amplifiers have different

resistor & capacitor values in this section to optimize the tone stack for the frequencies of the

namesake instruments.

• Level sets the overall output of the preamp.

BETA PREAMP

Hot Tubes

pedal in 1978 with a similar topology, but the Beta was the first time

12 Licensing

Tube Sound Fuzz

circuit in 1977, and Electro-

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