Ashdown CTM-15, CTM-30 User manual
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USER MANUAL
VALVE
THANK YOU
Thank you for purchasing your Ashdown Engineering Amplier and welcome to the family!
We really think you’ve made the right choice and know that this amplier will give you years of great
tone and service. It is a machine though and needs to be looked after, please read through this user
manual which will help you get the most out of your new Amp and keep it running as long as some
of our happiest and very famous customers.
CTM-15 Demo Video:
REGISTER ONLINE
Please register this product online so we can make sure we give you years of customer support
through our friendly in-house service centre.
Here is where you need to visit to register your product:
http://www.ashdownmusic.com/register
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Ashdown Ampliers reserve the right to change specications without notice. E & O E. All contents © Ashdown 2012. Ashdown Ampliers reserve the right to change specications without notice. E & O E. All contents © Ashdown 2012.
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USER MANUAL
VALVE
CTM-300 CTM-100
VU
FACILITIES AND CONTROLS (NOTE THAT THESE VARY ACCORDING TO THE MODEL)
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. On models with a single input this will be suitable for both Passive and Active basses.
EFFECTS SEND AND RETURN
These 1/4” jack sockets should be used to connect to an external eects device or pedal board. The EFFECTS SEND
output should connect to the INPUT of the eects unit, and the output of the eects unit should be connected to the
EFFECTS RETURN input Note that the signal level is at instrument level so this loop is suitable for eects pedals.
EQ CONTROLS
Use the MIDDLE, BASS and TREBLE controls to eect the overall tone of the sound.
MID SHIFT
Causes the MIDDLE control to operate at dierent points in the frequency spectrum dependant on the button being
either in or out.
BASS SHIFT
Causes the Bass control to operate at dierent points in the frequency spectrum dependant on the button being
either in or out.
BRIGHT
Adds an overall brightness to the sound when in the up position. (Note: The BRIGHT switch is not eective when the
GAIN control is set to full).
Ashdown Ampliers reserve the right to change specications without notice. E & O E. All contents © Ashdown 2012. Ashdown Ampliers reserve the right to change specications without notice. E & O E. All contents © Ashdown 2012.
MELLOW
Softens the overall tone slightly
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 volume of the amplier.
MUTE
In the in position, this switch mutes the out put of the amplier (useful for tuning, etc.).
PRE/POST
This switch determines whether the signal from the DI OUTPUT (see Rear Panel Facilities) is taken before/PRE the
EQ section (down position) or after/POST (up position).
VU METER
The VU meter provides a visual indication of the output level of the amplier. It also acts as a bias meter, ( not on
CTM15 ) please see the following page for more details.
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USER MANUAL
VALVE
CTM-30
REAR PANEL FACILITIES
DI OUTPUT
This 1/4” stereo jack socket is used to connect the amplier to a low impedance, balanced input on a PA system
or recording mixer. The signal can be taken PRE or POST EQ (see above), ie with or without the tone shaping
added by the EQ section of the amplier.
On the CTM30 the DI is derived directly from the output transformer and therefore is an exact copy of the sound
that you here.
SPEAKER OUTPUTS
There are dedicated Speakon connectors for 2, 4 and 8! load speaker cabinet congurations. 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.
CTM 30,and 15 are tted with jack outlets at 8 and 4 ohms.
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.
CTM-15
Tech Spec:
CTM 300,100 AND DH200
POWER OUTPUTS
CTM 300-- 300WATTS FROM 6 XKT88
DH200 --150 WATTS FROM 4 X 6550
CTM100-- 100WATTS FROM 2 X KT88
ALL AMPLIFIERS FEATURE USER ADJUSTABLE BIASING AND 2.4 8 OHM
OUTPUTS ON SPEAKON COMBI OUTLETS.
PRE AMPLIFIER ( all models ) 2 x ECC832 AND 2 X ECC82 + 1 X ECC99 (
CTM300)
CONTROLS Totally Passive tone shaping via Bass ,Middle Treble controls +
SHIFT controls for Bass, Middle controls, Bright and Mellow switches.
Gain and Master controls for clean and distorted tones
VU METER Dual Function for indication of output power and tube balance
and biasing
EFFECTS LOOP valve driven and recovered
DI out valve driven transformer coupled isolated ground with PRE/POST
EQ switching.
CTM30, LB30 DH 30
OUTPUT POWER 30 WATTS FROM 4 X EL84
AUTOMATIC BIAS FOR PLUG AND PLAY EASY VALVE REPLACEMENT.
4 AND 8 Ohms outputs on ¼” jack sockets
DI OUT Transformer derived sampled from output to include tube
distortion ( isolated ground)
PRE AMPLIFIER ( all models ) 2 x ECC83 AND 1X ECC82
CONTROLS Totally Passive tone shaping via Bass ,Middle Treble controls +
SHIFT controls for Bass, Middle controls, Bright switch
Volume control for clean and distorted tones
VU METER For indication of output power
EFFECTS LOOP valve driven and recovered
CTM15, DH 15
OUTPUT POWER 15 watts from 2 X EL84
AUTOMATIC BIAS FOR PLUG AND PLAY EASY VALVE REPLACEMENT.
4 AND 8 Ohms outputs on ¼” jack sockets
PRE AMPLIFIER ( all models ) 1 x ECC83
CONTROLS Totally Passive tone shaping via Bass ,Middle Treble
Gain and Master controls for clean and distorted tones
VU METER for indication of output power
Cool industrial wrinkle nish steel case with built in handle
Head supplied with GIG bag
DH15 combo also features a custom designed DUAL concentric “WHIZZER”
cone speaker rated at an incredible 250 watts and a cool ip top design.
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WILL STILL WORK
CTM-300/100
USER MANUAL
VALVE
AT REDUCED
POWER
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 amplier for at least 10 mins to allow the output tubes to fully heat up with the amplier 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 just at the start of the red ie 0db.
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 amplier.
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.
IDEAL SETTING KEEP OUT!
DO NOT SET ANY
TUBE THIS HIGH
THE VU METER
The VU meter tted 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.
Note there is a protection fuse tted to each of the output tubes and if no reading is obtained on the meter this fuse will have
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