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Front Panel

FRONT PANEL FACILITIES

INPUTS - There are two instrument inputs marked LOW and HIGH. The LOW input is highly sensitivity and also high

impedance to suit the output from PASSIVE (Low Output) basses - The HIGH input is low sensitivity and lower impedance to

suit the output from ACTIVE (High Output) basses. Plugging an active (High Output) bass into the LOW input will overload the

input, creating a fatter, warmer and more distorted sound. Experiment by plugging your bass into either input to achieve the

desired sound.

EFFECTS SEND AND RETURN - These 1/4" jack sockets should be used to connect to an external effects device or pedal board.

The EFFECTS SEND output should connect to the INPUT of the effects unit, and the output of the effects unit should be connected

to the EFFECTS RETURN input.

EQ CONTROLS - Use the MIDDLE, BASS and TREBLE controls to effect the overall tone of the sound. The MID SHIFT switch

causes the MIDDLE control to operate on higher frequencies in the up position, and lower frequencies in the down position.

The BASS SHIFT switch causes the BASS control to operate on deeper frequencies in the up position, and less deep frequencies

in the down position. The BRIGHT switch adds an overall brightness to the sound when in the up position. (Note: The BRIGHT

switch is not effective when the GAIN control is set to full).

GAIN - This controls the level of the signal sent to the MASTER section. To achieve a cleaner sound, turn the GAIN control down

and the MASTER up. To achieve a richer, more distorted sound, turn the GAIN control up and the MASTER down.

MASTER - This controls the overall output of the amplifier.

MUTE - In the in position, this switch mutes the out put of the amplifier (useful for tuning, etc.).

PRE/POST - This switch determines whether the signal from the DI OUTPUT is taken before/PRE the EQ section (in position) or

after/POST (out position).

VU METER - The VU meter provides a visual indication of the output level of the amplifier. It also acts as a bias meter, please

see the following page for more details.

Rear Panel

REAR PANEL FACILITIES

SPEAKER OUTPUTS - There are dedicated Speakon connectors for 2, 4 and 8! load speaker cabinet configurations. It is

important that the correct output or outputs are used to match the impedance load of your cabinets. Please refer to the

diagrams later in this manual.

Ashdown Amplifiers reserve the right to change specifications without notice. E & O E. All contents © Ashdown 2012.

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USER MANUAL

CTM 300 / CTM 100

OFF/PREHEAT - Use this switch to pre-heat the valves, bringing them up to the correct operating temperature before

performing.

STANDBY/FULL - No signal is sent to the speakers when this switch is in the STANDBY position. Switch to FULL when you are

ready to perform.

THE VU METER

The VU meter fitted to the CTM is a dual function meter detailed as follows:

By using the push button selector switch marked "AUDIO / BIAS" the functions

are accessed in the following manner:

1/ "AUDIO" - In audio mode the meter is set to read the audio output of

each of the six power tubes and each can be measured by utilising the rotary

selector switch on the front panel. Whilst playing this is the normal mode of

operation of the meter and the reading obtained will be a direct indication

of the power being produced by each output tube, the meter is calibrated so

that when the needle reaches the start of the red section the power tube being

measured will be producing maximum clean volume.

The switch can be rotated to select any of the power tubes and its relative

output will be indicated on the meter, note that when performing this test you will need to play at equal volume for each test.

2/ "BIAS" - In this mode the meter will glow RED.

To check the bias of the output tubes proceed as follows:

Run the amplifier for at least 10 mins to allow the output tubes to fully heat up with the amplifier set to mute. Standby on.

Select.. Tube 1 and with an insulated jewelers screwdriver gently adjust the trimmer situated on the rear panel. The reading to

aim for is the needle vertical at the 12 o'clock position.

Note that although each tube can be adjusted individually it is possible to get tubes that cannot be adjusted to the correct

reading, these can still be used providing the reading is not in the red, a lower reading is acceptable and will note impact

audibly on the power output or sound quality of the amplifier.

Please also note that the trimmers are 25 turn types to make adjustment easy, This type of adjuster has no end stop so if you

reach a point where the adjuster will not give any more adjustment then the output tube will have to be replaced if the reading

is to high ie in the RED.

Repeat this for each of the six output tubes in turn.

RETURN THE METER TO "audio" MODE AFTER BIASING. DO NOT RUN THE AMPLIFIER IN BIAS MODE WHILST PLAYING.

Note there is a protection fuse fitted to each of the output tubes and if no reading is obtained on the meter this fuse will have

failed. The protection fuses are situated next to the output they are protecting the correct rating is 315Ma quick blow, in the

event of a blown fuse they MUST be replaced with fuses of the correct rating and type.

A continually blowing fuse would indicate either an incorrectly biased output tube or a defective output tube.

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IDEAL SETTING

KEEP OUT!

WILL STILL WORK

DO NOT SET ANY

AT REDUCED

TUBE THIS HIGH

POWER