GUIDED TOUR - FRONT PANEL
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1. Guitar input: This is where you plug in your guitar
TIP: Obviously you can use stomp boxes like Compressors, Overdrives and Distortions, Phasers,
Flangers etc. in front of your amp. If you are using quite a few of them, make sure you also use a BUFFER
to keep the quality of your guitar signal as high as possible. Long cables (and bad cables) suck the tone
out of your sound and a c hain of stomp boxes, even with True Bypass, are essentially just a long cable, so
make sure you keep your signal strong.
2. This little LED will show you what channel is selected. Green for CLEAN and red for
DISTORTION.
3. Channel Switch: CLEAN and DISTORTION.
4. This is the GAIN control for the CLEAN channel. With higher settings you might get some gristle and
a slight overdrive in the Clean channel. This is also dependent on your pickups. Pickups with higher
outputs will “push” the tubes more and give you more drive. Single Coil pickups usually have less output
than Humbuckers. It also depends on the state of the BOOST switch. All these factors influence how
much gain will be generated in the preamp section of the MJOLNIR.
5. Bass control of the CLEAN channel: at 12 o’clock it is neutral. Turning it clockwise will boost the
bass and counterclockwise will cut or attenuate the bass frequencies.
TIP: We all know it’s nice to have a fat sound and make the speaker move the pants around your legs, but
remember: You also have a bass player in the band and he has a job to do, so give him some room
(frequencies) to do his job. Together you will sound like an unstoppable army if you play tightly and get
out of each other’s way.
6. Middle control of the CLEAN channel: at 12 o’clock it is neutral. Turning it clockwise will boost the
mids and counterclockwise will cut or attenuate the mid frequencies.
TIP: Most of what defines a guitar sound happens here. The MIDS are the most important frequencies for
the guitar player. Just look at our typical 1X12 speaker. They can’t do very low bass and they most
certainly cannot produce a lot of high frequencies. So try to learn what the MIDS sound like. See how t hey
add warmth when you increase this knob and how they can dig a hole in your sound if you attenuate.
7. Treble control of the CLEAN channel: at 12 o’clock it is neutral. Turning it clockwise will boost the
treble and counterclockwise will cut, or attenuate, the treble frequencies.
TIP: Play with this control for clarity and bite. Turning it down a bit could help you tame piercing single coil
sounds.
Congratulations on buying a MJOLNIR 15 Watt tube head from Joyo.
Just in case you don’t know about the awesome power of MJOLNIR, let us share some of the mythology
with you. MJOLNIR is the hammer of Thor. Thor is the son of Odin, father and ruler of the gods of Asgard
from the ancient Norse Mythology. Thor, also known as the god of thunder, wields this weapon which is
famed for having the power to level mountains. Can you begin to guess why we chose this name for our
metal amplifier?
In the movie version of Thor, based on the comic superhero, Odin enchants MJOLNIR so that only Thor
can pick it up if he is worthy and pure of heart. No one other than Thor has the strength to pick up
MJOLNIR and unleash its fury. Are YOU worthy of its power?
I think it is clear now that this name was not chosen lightly. It encompasses all that we wanted to achieve
with this amplifier: Power - Metal - Strength.
Now let’s get into the details…
I suggest you take a few minutes to browse through those pages, there might actually be some useful
information hidden here. We want to make sure you are treating your new MJOLNIR with respect, so that
it serves you well without fail.
MJOLNIR is an amplifier with a two channel design. Both channels are completely independent of each
other and can be set up differently for a wide variety of sounds. One of the main characteristics of
MJOLNIR is its percussive attack, which further underlines the hammer analogy. Each note just hits you
with a wall of sound.
The CLEAN channel can be molded into many different sounds with the flexible three band EQ section
and the Presence control. The BOOST switch also applies to this channel, so play around with a boosted
clean sound.
If you engage the PUSH switch, the CLEAN channel will transform into a crunch channel which can be
pushed even further with the BOOST switch. Here you can unleash amazing rhythm sounds, experience
overdrive sounds you are familiar with from the greats in rock history and generally hear the “british” side
of MJOLNIR.
Should this not be enough for you, switch to the DISTORTION channel to get more GAIN than you ever
dreamed of. In this channel, the effect of the BOOST switch is less noticeable because there is already a
lot of gain at work. The DISTORTION channel features the MID CUT switch, which helps you to dig a nice
hole in the mid frequencies to get those coveted modern rock and metal sounds. These modern rhythm
sounds have less frequency content at around 400-500 Hz, which helps the bass and high mid
frequencies to have more room to punch you in the face.
For a more classic metal sound, leave this switch in the normal position. For creamy lead tones, give your
sound some kids and thin out the bass just a bit.
Obviously, the MJOLNIR has 4, 8 and 16 Ohm outputs so that you can connect any available speaker
cabinet.
The built in FX Loop (located between the Preamp and the Power-Amp) can be used for your FX pedals or
rack gear. This type of Loop is primarily used to effects that need to be behind the distortion, which
applies to some types of modulation, EQ and especially time based effects like Delay and Reverb. It can
be switched off when it is not in use for a cleaner, more direct, signal path. The send level from the
preamp can be adjusted to match the required input of your effects.
For live performance you can use the included footswitch to change between the CLEAN and the
DISTORTION channel.
Let’s talk some tech here…
As you can clearly see, the MJOLNIR is an ALL METAL design, just like its inspiration, the hammer of
Thor itself. Unlike the h ammer, it uses 3 E CC83 tubes (12AX7) and 1 ECC82 tubes (12AU7) in the power
amp. (Actually, who knows how the hammer worked, for all we know it might have had tubes)
In the following pages we will go through every control of the MJOLNIR in detail.
Additionally, feel free to check out our website www.joyoaudio.com for complete information about our
full product line.
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