Colby Amplification MM12 Owner's Manual - Page 3

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The bottom row

STAGE 2

The Stage 2 On/Off switch brings in an extra gain stage in the On setting. With the Gain control on the

minimum setting you will notice that there is little change in volume between the two settings but there

is a tonal change. This is intentional. This give you more tonal variability and allows you to get the right

tone whether you are going for a clean or overdriven sound, an old tone or a modern tone. In general,

the Off setting is "better" for clean sounds and the On setting is "better" for OD sounds. Turing the Gain

up (clockwise) adds more gain. The total gain is set with a combination of the Volume and Gain controls.

The high and mid frequency content can be tailored by use of the Emphasis, Volume and Gain controls.

More on this later in the SETTINGS section

LOOP ON/OFF: This turns the tube effects loop on or off. The send and return jacks and level controls

are on the back panel

MASTER Section

PRE VOL: This is the first Master Volume control. It is in the circuit where a "traditional" Master volume

control goes and is useful for getting overdriven sounds at low volumes. However, it is not great for all

types of sounds. That's why we have another Master (Post VOL)!

PRESENCE: turning clockwise increases the top end by reducing the negative feedback at high

frequencies

HI TRIM: This control cuts the high frequencies after the phase inverter. It is a very useful control that

allows you to dial in the right top end frequency response for the different types of sounds this amp can

produce

POST VOL: This is the second Master Volume control. It is after the phase inverter (PI) and is known as a

Post Phase Inverter Master Volume or PPIMV. Since this control is after the PI and the PI adds gain, using

this Master gives you even more OD possibilities. With higher setting of Volume, Gain and Master, the

POST VOL can give you more gain than the PRE VOL master control. Having both MV types gives you the

ability to get great overdriven sounds at just about any volume.

Back Panel

Mains input connector (make sure the wall AC voltage is correct for your amp)