Legacy Bass Amplification

427 Small Block 427-watt all-valve head

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427 Small Block

Front view - Click to enlarge [+]

Lurking under the hood of this all-tube muscle-amp is an octet of KT88s and three over-fed transformers, creating a monster power stage that just won't quit. Put the pedal to the metal and the 427 surges into action with thundering tones ranging from clean to fat to downright filthy, courtesy of an ECC83-fueled preamp loaded with passive tone circuits and a whole lot of attitude.

The 427 Small Block head features High and Low gain inputs, front panel-mounted Effects Send and Return, rotary Bass, Middle and Treble controls with Mid Shift, Bass Shift and Bright switching, Mute switch, rotary Gain and Master volume controls and balanced DI output with Pre/Post EQ switching.

The 427 Small Block head partners perfectly with a range of Ashdown US Series cabinets. US Series.

427 Small Block Specifications

Power Output 427W
Power Requirement 230 / 115 / 100V
Speaker Outputs speakon/Jack
Frequency Response -3dB at 35Hz and 14kHz
High Instrument Input impedance 1m Ohms, input range 25mV - 1.5V p-p
Low Instrument Input impedance 100k Ohms, input range 25mV - 6V p-p
Line Input impedance 100k Ohms, input level 0dBu nominal
DI Output 600 Ohms balanced, level 0dBu nominal
Impedance 2 Ohms
EQ -3dB at 35Hz and 14kHz
Effects Send 1k Ohms, level 0dBu nominal
Effects Return 1M Ohms, input level 0dBu Nominal
Pre-Amp Tubes 1 x ECC83 1 x ECC82
Output Tubes 8 x KT88's
H x W x D (mm) 362 x 610 x 300
Weight (kg) 35






Quick Review:

Amazing sounding amp and its beautiful to look at as well which helps.

Nate Mendel | Foo Fighters
427 Small Block