Page 1
THE MK50H. ALL VALVE 50 WATT HEAD
Spec: 50 watt all valve head. One channel, with foot-switchable overdrive and master
volumes.
Valves: 2 x 5881WXT. 4 x 12AX7WA.
Cabinet: 19mm ply, lock-jointed.
Hardware: All corners, screws, cup washers, handle fixings etc., are
nickel-plated. Bespoke CNC punched, powder coated grills. 16
Gauge (1.5mm) powder coated chassis with 14 gauge base / screening plate
secured to chassis with 4 machine screws. Leather handle.
Transformers: Custom designed in-house and hand wound.
Construction
Methods: Point to point hand wired and hand assembled throughout.
No PCBs of any sort.
Controls: Chicken head knobs. Metal toggle mains switches. 2 x input sockets:
high and low gain. Front panel from left to right: Volume/gain, Overdrive (foot
switchable extra gain with red LED indicator), Bass, Middle, Treble, Master 1
and Master 2 (foot switchable for volume lift and tonal differences from the
power amp with green LED indicator), Presence, Resonance, Standby switch
and Mains switch.
Rear panel from left to right: Mains inlet, Mains fuse, HT fuse, Speaker
impedance selector for 4, 8 and 16 ohm loads, Series effects loop send and
return sockets, footswitch socket.
Accessories
Supplied: Footswitch: 14 gauge mild steel, powder coated, with 2 metal footswitches and
LED indicators for Overdrive and Master 2,
Top quality 8mm cable wired to Neutrik nickel-plated stereo jack.
3 metre mains lead.
Speaker lead, 600mm, top quality 8mm cable with nickel-plated Neutrik jacks.
Page 2
MK50H CONTROL OPERATION
Volume Adjusts overall pre amp gain.
Overdrive Adjusts the amount of extra signal coming from the first gain stage.
This is added to the amount of pre amp gain you have set; you don’t
switch to overdrive, you add it to the pre amp gain thus having a more
extreme setting but keeping the tonal integrity.
Bass Adjusts low frequency response of the pre amp.
Middle Adjusts frequencies around 500 Hz in the mid-range.
Treble Adjusts high frequency response of pre amp.
Master 1 Sets the output level of the amplifier, generally pre-set for rhythm but
not strictly.
Master 2 Master 2 also sets output level of amp but is generally pre-set for a
different level than Master 1 so that a pre-set volume boost can be
obtained.
Presence Boosts high frequency response of the power amp only.
Resonance Boosts low frequency response of the power amp only, allowing a
tighter or looser bass response overall.
Effects loop This is a series effects loop, the send level is –6dBV. Suitable for foot
pedals and rack processors.
Speaker This can be set to accommodate 4, 8 and 16 ohm speaker loads
Impedance
Selector
.
Page 3
Suggested settings for the MK50H
SUGGESTED
SETTINGS
Volume Overdrive Bass Middle Treb. Master 1 Master 2 Pres. Res.
Clean
Crunchy
rhythm
Crunchy lead
Rock lead
Rock rhythm
Metal lead
3 _ 6 4 6 5 _ 8 2
8 _ 5 7 4.5 2 _ 7 2.5
8 _ 5 7 4.5 _ 4 7 2.5
8 6 6 5.5 4.5 _ 3-4 5 3
8 _ 6 5.5 4.5 2 _ 5 3
8 8 7 3 6 _ 4 8 5
Metal rhythm
**Clean
**Crunch
**Lead
• Switching the overdrive in will give you a much heavier rhythm sound.
SS** Switching the overdrive in will give you a much heavier rhythm sound.
8 (8)* 7 3 6 2 _ 8 5
3-5 _ 6 4 5 _ 3.5 7 3
3-5 10 6 4 5 2 _ 7 3
3 10 6 4 5 _ 3.5 7 3
** Using the overdrive in and out from Master 2 to Master 1 a useful range of tones can
be obtained. Note also that turning the guitar volume down with crunchy rhythm tones
can result in some fat, clean tones.
Please note the controls are very sensitive and altering them by small degrees will give
many different sounds: don’t just try setting everything to 11.
Please set Master 1 and Master 2 to a level that is appropriate to your playing situation.
These are some settings which can be used as a guide to help you achieve your required
sounds.
Page 4
Important Safety Instructions
WARNING – When using electrical products, basic precautions
should be followed, including the following:
1. Read all the instructions before using the product.
2. Do not use this product near water – for example, near a bathtub, wash
bowl, kitchen sink, in a wet basement, near a swimming pool or the
like.
3. This product may cause permanent hearing loss. Do not operate for
long periods of time at high volume level or at any level that is
uncomfortable. If you experience any hearing loss or ringing in the
ears, you should consul an audiologist.
4. The product should be located so that its location or position does not
interfere with its proper ventilation.
5. The product should be located away from heat sources such as
radiators, heat registers, or other products that product heat.
6. The power supply cord of the product should be unplugged from the
outlet when left unused for a long period of time.
7. Care should be taken so that objects do not fall and liquids are not
spilled into the enclosure through openings.
8. The product should be serviced by qualified personnel when:
a. The power supply cord or the plug has been damaged: or
b. Objects have fallen, or liquid has been spilled into the product:
or
c. The product has been exposed to rain or moisture: or
d. The product does not appear to operate normally or exhibits a
marked change in performance: or
e. The product has been dropped, or the enclosure damaged.
9. Do not attempt to service the product. All servicing should be
Referred to qualified personnel.
10.For continued protection against risk of fire, replace fuses only
With those of the same type and rating as indicated on the back of the
product.
11. Always connect the speaker before switching on.
Page 5
GROUNDING INSTRUCTIONS
This product must be grounded (earthed). If it should malfunction or
breakdown, grounding provides a path of least resistance for electrical
current to reduce the risk of electric shock. This product is equipped
with a supply cord having an equipment grounding conductor and a
grounding plug. The plug must be plugged into an appropriate outlet
that is properly installed and grounded in accordance with the local
codes and ordinances.
DANGER
Improper connection of the equipment-grounding conductor can result
in a risk of electric shock. Check with a qualified electrician or
serviceman if you are in doubt as to whether the product is properly
grounded. Do not modify the plug provided with the product – if it will
not fit the outlet, have a proper outlet fitted.
The wires in this mains lead are coloured with the following code:
EARTH NEUTRAL LIVE
U.S.A. Green White Black
U.K. Green/Yellow Blue Brown
CE mark for European Harmonised Standards
The CE mark which is attached to these products means it conforms to
EMC Directive (89/69/EEC), CE mark Directive (93/68/EEC) and Low
Voltage Directive (72/23/EEC).
VALVES AND FUSES
All valves and fuses fitted to a Cornford amplifier are
consumable items and, therefore, are not covered under the
manufacturer’s guarantee.
Loading...