Aguilar DB 728 Owners Manual

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Model DB 728
400-Watt Tube Power Amp

Congratulations on purchasing Aguilar Amplification’s DB 728 Tube Power
Amp! The DB 728 is an extremely rugged tube amplifier optimized for bass. Ten

vacuum tubes generate 400 Watts of harmonically rich tone. Custom designed
toroidal transformers provide an ultra-wide frequency response.

In addition to sounding great with any active or passive four string bass, the DB
728 will musically and accurately reproduce the extended range of modern five
and six string basses.

All Aguilar products are hand made in N.Y.C.

www.aguilaramp.com

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Specifications and features:

All noise measurements are unweighted.

Input Sensitivity: 0 dBm for maximum output.

Output Power: 400 watts RMS. This is into 2, 4, or 8 ohms.

Noise: -80 dB

Fuses: 1 external 12 amp for 100 – 120 VAC operation.

(6 amp for 220 – 230 VAC operation)
1 internal redundant per above

8 internal .250 Fast-Blo. One per tube.
1 internal 15 amp Slo-Blo.
1 internal 2 amp Fast-Blo.

Power tubes: Eight premium Svetlana 6550C power tubes.

Driver tubes: Two 12AX7 and one 12AU7.

Transformers: Custom designed toroidal output transformer for ultra-wide

bandwidth. Power transformer is also toroidal.

Outputs: 2 Speakon connectors and 2 ¼” outputs.

Inputs: One ¼” unbalanced input and one input thru for patching a

preamp signal thru to an additional power amp

Output Impedance Selector: A three-position switch provides switching for

two, four, or eight ohms.

Cooling: Two ultra-low noise fans regulate the operating temperature

of the amp.

Weight: 57 lbs.

Chassis: Aircraft quality aluminum construction provides sturdiness

without excessive weight. For convenience, access to the
tubes is provided through the top of the unit and is isolated
from any dangerous voltages.