Suhr SL-67 MkII HAND WIRED User manual
USER GUIDE
SL-67 MkII HAND WIRED
™
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions
2. Keep these instructions
3. Heed all warnings
4. Follow all instructions
5. Do not use this apparatus near water
6. Clean only with dry cloth
7. Do not block any ventilation openings. Install in accordance with the manufacturer's
instructions
8. Do not install near any heat sources such as radiators, heat registers, stoves, or
other apparatus (including ampliers) that produce heat
9. Protect the power cord from being walked on or pinched, particularly at plugs and the
point where they exit from the apparatus
10. Unplug this apparatus during lightning storms or when unused for long periods of
time
11. Refer all servicing to qualied service personnel. Servicing is required when
the apparatus has been damaged in any way, such as: power-supply cord or plug
is damaged, liquid has been spilled on, objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped.
12. CAUTION: To disconnect the unit completely from the MAINS, unplug the unit.
Turning the power switch off does not disconnect the unit completely from the MAINS.
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Thank you for purchasing the Suhr SL-67 MkII Hand Wired amplier.
OVERVIEW
The Suhr SL-67 MkII is a no compromise 50 watt version of our popular SL-68 MkII hand
wired amplier. Housed in a “small box” enclosure, the SL-67 MkII is light, portable, and
built to deliver the complete range of classic British-style tones at any volume. From
sparkling cleans to screaming high-gain Variac™ style overdrive tones, the SL-67 MkII
responds dynamically to every nuance of your playing style and instrument with just a
turn of your guitar’s volume control.
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FRONT PANEL
POWERING INSTRUCTIONS
With the Power, HI/LOW Select Switch in the Off position and the Standby Switch in the
Standby position, ip the power switch to the desired power (HI/LOW) position. Wait
sixty seconds and then ip the Standby Switch to the on position.
To power down, simply ip the Standby Switch to the On position and then ip Power,
HI/LOW Select Switch to the Off position.
POWER SELECTOR SWITCH (3-position)
OFF: Power is switched OFF
HI: ON, normal operation
LOW: In the late 70’s an L.A. based Hard-Rock guitarist burst on the scene with a highly
saturated tone that he achieved by pairing a vintage British head, with a Variac voltage
controller that he used to drop the power to create the “brown sound”. This setting
delivers that tone by dropping the voltage (approximately 25%) which changes the
SL-67 MkII’s feel from tight and aggressive, to spongy and saturated, while delivering
incredible sustain.
NOTE: Dimming of the power indicator light in LOW mode is normal.
STANDBY SWITCH
ON: Amplier is in Standby
STANDBY: Amplier is active
PRESENCE
Adjusts the amount of high frequencies. Turning it clockwise will add more cut and
sparkle.
BASS
Adjusts the amount of low end. Turning it clockwise increases the amount of low
frequencies, giving you a fuller tone. Turning it counter clockwise will reduce the effect
and tighten up the bottom-end, useful when performing at louder volumes.
MIDDLE
Adjusts the midrange. Turning it clockwise increases the amount of mids, giving your
tone a fatter response. Turning it counter clockwise will produce a mid-scooped sound.
TREBLE
Adjusts the top end. Turning it clockwise increases the amount of treble, giving your
tone clarity and brightness. Turning it counter clockwise will produce a warmer sound,
excellent for dialing in smooth uid-like lead tones.
VOLUME I
Adjusts the overall output level of Channel I.
VOLUME II
Adjusts the overall output level of Channel II.
A WORD ABOUT THE SL-67 MkII’s DYNAMICS AND YOUR GUITAR’S VOLUME CONTROL
The SL-67 MkII responds dynamically to every nuance of your playing style. When you pluck a string, your guitar’s pickups convert that energy to a voltage that is sent through the input
circuitry. With your guitar’s volume control at maximum (using humbuckers) that voltage is approximately one volt. Turning your instrument's volume control down, or picking softer,
decreases the voltage which changes the characteristics and amount of distortion. Due to the SL-67 MkII’s input circuitry design you can achieve a wide spectrum of overdriven tones
by simply adjusting your guitar’s volume control.
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OPERATING INSTRUCTIONS (continued)
BRIGHT SWITCH: (3-position)
Left position: Bright cap is removed from circuit. This position is the stock position
found in the Original Suhr SL series.
Middle position: Medium bright
Right position: Full bright: Adds brilliance, presence and sparkle to your tone, making
your guitar. ‘Full’ bright is the stock value found in vintage amps.
NOTE: When 'Volume I' is all the way up (on 10) you will not hear a difference between
Bright-Cap settings. Lower 'Volume I' and changed between the 3 Bright Cap settings
to nd the perfect setting. For example, when using single-coil pickups, try removing the
Bright-Cap. When using a humbucker, try the 'Medium' and 'Full' Bright-Cap settings.
FAT-CAP SWITCH: (2-position)
Left position: Removes FAT-CAP from circuit. This allows you to get closer to a ‘true’,
stock vintage amp.
Right position: FAT-CAP in circuit. One of the only tweaks found on a very famous
amp John worked on in the 80’s, the Fat-Cap adds low-end punch and bass that’s
perfect when using the ‘Treble’ channel. In the original SL series, the ‘Fat’ cap was
always in the circuit.
MID-BOOST SWITCH: (2-position)
Left position: Mid-boost disengaged.
Right position: Mid-boost engaged, adding a touch more gain to the phase inverter
and subtly elevating the tone-stack, delivering an added kick to the midrange. It's your
go-to when dimeing the controls (all controls on 10).
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OPERATING INSTRUCTIONS (continued)
BRIDGING OR JUMPING THE CHANNELS
Bridging or Jumping the channels will unlock a palette of sounds and expand the SL-
67 MkII’s possibilities. Begin by plugging your guitar into the top (high sensitivity) input
of Channel I, then run a short instrument patch cable from Channel I’s bottom (low
sensitivity) input to the top (high sensitivity) input of Channel II, then blend Volume I and
Volume II controls to dial in a wealth of new and unique tones.
NOTE: When only using Input I, turning up Input II's Volume control will increase gain
slightly.
INPUTS
CHANNEL I INPUT (top)
Has high sensitivity (which offers more gain) and a brighter tonal response.
NOTE: This input is most commonly used.
CHANNEL I INPUT (bottom)
Has low sensitivity and offers a slightly warmer tone.
CHANNEL II INPUT (top)
Has high sensitivity and offers a normal/bassier tonal response.
CHANNEL II INPUT (bottom)
Has low sensitivity and a normal/bassier tonal response.
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MASTER VOLUME
Adjusts the SL-67 MkII‘s overall output level and offers the exibility to dial up rich, classic overdrive at any volume.
NOTE: Turning the SL-67 MkII's Master Volume to 10 will remove it from the circuit.
TUBES
The SL-67 MkII’s tube complement consists of two EL-34 power tubes and three 12AX7 preamp tubes.
SPEAKER OUTPUTS
Two loudspeaker outputs wired in parallel with 3-way impedance selector switch for 4Ω, 8Ω & 16Ω.
IMPORTANT: To avoid serious damage to your amplier, never operate it without a speaker or suitable load.
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SPECIFICATIONS*
Output: 50 Watts RMS
Tubes: 2-EL34 & 3-12AX7
Mains Fuse
2 Amp Slo-Blo
H.T. Fuse
F 0.5A/250V (Fast-Blo)
Front Panel: OFF/HI/LOW Power Select Switch, Presence, Bass, Middle, Treble, Volume
I, Volume II controls, Fat-Cap Switch, Mid-Boost Switch, Bright-Cap Switch, and four Inputs
Rear Panel: Master Volume, two Speaker outputs, Impedance Selector (4Ω, 8Ω, & 16Ω),
HT Fuse, Mains AC Inlet and Mains Fuse
Dimensions: 26” (W) x 8.25” (D) x 10.25” (H)
Weight: 42 lbs.
*All specications subject to change without prior notice.
SUHR.COM
Warranty
For warranty information on the Suhr SL-67 MkII as well as all other
Suhr products, please visit,www.Suhr.com/Warranty
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