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AMT BC-1 “Bass Crunch” – 2-channel JFET bass guitar preamp

Features overview

We are happy to present one of the most versatile bass guitar preamps on the market in a such small package – AMT Electronics BC-1 “Bass Crunch”!

The preamp has been built on the basis of the custom technology by АМТ using JFET emulation of the vacuum tube range clipping. The wide adjustment range in combination with rich functional possibilities that can only be found in a stomp box have considerably increased the preamp versatility.

«Bass crunch» BC-1 preamp is based on a two-channel circuit.

CLEAN channel shapes the classic bass guitar sound characteristic for «old» amplifiers and allows both velvet transparent sound and slight compressed overdrive depending on the position of Gain control.

DRIVE channel contains a number of over amplification stages and is intended for obtaining the modern sound from clean to totally overdriven one. The High Mode provides additional possibilities in terms of the range enrichment towards higher sound density and aggressiveness. The adjustable 3-position mid-range filter combined with deep adjustments along the frequency ranges offer a musician its rich possibilities related to shaping of the overdriven tone range.



Level – output signal level adjustment
High – high frequencies adjustment
Mid – middle frequencies adjustment
Low – low frequencies adjustment Gain – channel sensitivity adjustment


Level – output signal level adjustment
High – high frequencies adjustment
Mid – middle frequencies adjustment by means of rejecter filter Freq. notch Freq. notch – cutout frequencies switch (rejecter filter) 500Hz, 330Hz, 230Hz.
Low – low frequencies adjustment
Pre. Notch – rejecter filter switch before Drive stage. 700Hz, 400Hz.
Gain – channel sensitivity adjustment

Overall Controls

Blend – signal level balance adjustment between channels Clean and Drive
Master volume – BC-1’s overall output level adjustment.
Footswitch DRIVE – Drive channel on/off Led – Drive channel on indicator
Footswitch HI/LO – Drive channel increased sensitivity on/off. Led – HI/LO mode with Drive channel increased sensitivity on indicator.

Connections Right Panel

INPUT – instrument input of the preamp
SEND FX – signal send to aux effect
RETURN FX – aux effect signal return

Left Panel

OUTPUT – direct output to power amp.
CTRL OUT – AMT TS-2MIDI aux convertors control output
CAB.SIM. – direct output to mixer’s line input.
DI OUT – balanced output intended for connection of devices equipped with balanced inputs.

Power DC 18V – for connection of power adapter
Battery compartment – for two 9V batteries installation.