Audio Database
DB-1
Commentary

A control amplifier designed by David Hadaway and named "The Essential Preamp".

The control amplifier DB-1 has a structure in which the power supply part is separated, and the control body DB-1 (¥ 157,000) and the power supply part DB-2 (¥ 41,000) are combined.

The basic functions of the preamp are thoroughly pursued, and the circuit is composed of a cascode amplifier without using any differential amplifier or complimentary service method.

A wood case is attached to the control body DB-1.

DB-3 Crossover, DB-4 Head Amplifier and DB-5 Tone Control are sold separately. These three models are designed to share the DB-2 power supply.

Model Rating
Type Control amplifier
Total harmonic distortion factor 0.0003%(1kHz)
0.0008% or Less (20 Hz to 20 kHz, Output 3 V)
Phono input
(IHF-A for 10 mV input)
1V(20kHz)
100mV(1kHz)
10mV(20hz)
Signal-to-noise ratio (IHF-A) Phono : 89 dB (input short-circuit, 10 mV input)
83 dB (cartridge mounted, 0.65 Hz, 650 Ω)
74 dB (Input Open)
High level : 90 dB (input short, 1 V output)
Maximum power output 6 v (10k Ω Load)
Input sensitivity (at 1 V output) Phono:2mV
High level : 120 mV
Phono maximum allowable input 160mV(1kHz)
Filter Low-cut (Phono only) : 20Hz/36Hz, 6dB/oct.
High Cut : 5kHz/10kHz, 6dB/oct.
Pwer 100 VAC, 50Hz/60Hz
External dimensions Body : Width 216x Height 81x Depth 178 mm
Power Supply : W 160x H 81x D 107 mm
Weight Body : 1.2 kg
Power Supply : 1 kg
Attachment Wooden case