427 Small Block

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  • 427 Small Block

427 Small Block

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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.


Power Output 427 Watts
Power Requirement 230/ 115/ 100V
Speaker Outputs Speakon/Jack
Frequency Response -3dB at 35Hz - 14Khz
High Instrument Input Impedance 1m Ohms, input range 25mV - 6V p-p
Low Instrument Input Impedance 100K Ohms, input range 25mV - 6V p-p
DI Output 600 Ohms balanced, level 0dBu nominal 
Output Impedance 2 Ohm 
EQ -3dB at 35Hz and 14 kHz
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
H x W x D (mm)

362 x 610 x 300

Weight (kg) 35

5 Year Warranty

We're so confident in our amplifiers, we offer a 5 year warranty on all new products.

Built for the road

Perfect for gigging musicians, our products are built to last.