Ashdown BTA 400 Head

400W Vacuum Tube Head

When Ashdown made a tube amp head, it was always going to be something very special. The BTA 400 (Big Tube Amp) partners a feature-laden ABM EVO III preamp with a sledgehammer 400W power section comprising of 8 KT88 tubes and massive output transformers. You get a sub-harmonic generator, built-in compressor and classic Ashdown 'rotary plus slider' EQ providing 20dB of cut and boost at 60Hz, 660Hz and 5kHz, supplemented by 15dB cut and boost at 180Hz, 340Hz, 1.3kHz and 2.6kHz. Comprehensive connectivity includes a balanced DI output with pre or post EQ switching, a sub-bass output, a tuner output, an FX loop and a line input, and a 4-way footswitch is included for maximum performance control. Alongside great tone and flexibility, what makes the BTA 400 really special is its reliability. With a chassis suspended on car engine mountings and a circuit design that will even survive running with no speakers connected, this is a tube bass amp head you can depend on.

Specifications
Power Output (RMS) 400W
Power Requirement 230 / 115V
Frequency Response -3dB at 17Hz and 30kHz
High Instrument Input Impedance 3.9m Ohms, input range 150mV - 20mV p-p
Low Instrument Input Impedance 10k Ohms, input range 300mV - 40V p-p
Line Input Impedance 22k Ohms, input level 0dBu nominal
Sub Output Impedance 1k Ohms, level 0dBu Nominal
DI Output 600 Ohms balanced, level 0dBu nominal
Tuner Output Impedance 22k Ohms, level 0dBu nominal
EQ Bass +/-15dB @ 45Hz
Middle +/-15dB @ 660Hz
Treble +/-15dB @ 7kHz shelving
Slider 1 +/-15dB @ 180Hz
Slider 2 +/-15dB @ 340Hz
Slider 3 +/-15dB @ 1.3kHz
Slider 4 +/-15dB @ 2.6kHz
Shape (Push Flat) +8dB @ 50Hz & 4kHz, -8dB
@ 400Hz, filter slope - 6dB/octave
Effects Send Impedance 22k Ohms, level 0dBu nominal
Effects Return Impedance 22k Ohms, input level 0dBu Nominal
H x W x D (mm) 266 x 610 x 335