Suhr Sl-67 User manual

USER GUIDE

SL-67 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 ampliers) 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 qualied 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.

Thank you for purchasing the Suhr SL-67 Hand Wired amplier.

OVERVIEW

The Suhr SL-67 is a no compromise 50 watt version of our popular SL-68 hand wired

amplier. Housed in a “small box” enclosure, the SL-67 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 responds

dynamically to every nuance of your playing style and instrument with just a turn of

your guitar’s volume control.

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’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: Amplier is in Standby

STANDBY: Amplier 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’s DYNAMICS AND YOUR GUITAR’S VOLUME CONTROL

The SL-67 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’s input circuitry design you can achieve a wide spectrum of overdriven tones by

simply adjusting your guitar’s volume control.

OPERATING INSTRUCTIONS (continued)

BRIDGING OR JUMPING THE CHANNELS

Bridging or Jumping the channels will unlock a palette of sounds and expand the SL-

67’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.

MASTER VOLUME

Adjusts the SL-67‘s overall output level and offers the exibility to dial up rich, clasic overdrive at any volume.

NOTE: Turning the SL-67's Master Volume to 10 will remove it from the circuit.

TUBES

The SL-67’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 amplier, never operate it without a speaker or suitable load.

SAMPLE SETTINGS

PUNCHY CLEAN

LEAD

CRUNCH

BRIDGED

Power: HI, Master Volume: 8, Presence: 6, Bass: 6, Middle: 5, Treble: 7, Volume I: 4, Volume II: 0

Power: Low, Master Volume: 4, Presence: 5, Bass: 5, Middle: 6, Treble: 5, Volume I: 10, Volume II: 0

Power: HI, Master Volume: 4, Presence: 6, Bass: 6, Middle: 5, Treble: 7, Volume I: 7, Volume II: 0

Power: Low, Master Volume: 4, Presence: 6, Bass: 6, Middle: 5, Treble: 7, Volume I: 10, Volume II: 7

WARRANTY FOR SUHR AMPLIFIERS AND ELECTRONIC PRODUCTS

JST warrants for lifetime from date of purchase by the initial retail purchaser that this product shall be free from defects in workmanship. Electronic components such as capacitors,

resistors, lters, transformers, jacks, and pots are covered for 5 years. Any parts determined defective by JST within the ve (5) year term shall be repaired or replaced by JST without

charge for parts and labor provided the unit is returned, transportation costs prepaid, to JS Technologies, Inc., 601 Crane Street, Unit A, Lake Elsinore, CA 92530, or to such facility

authorized by JST. JST will pay shipping costs to return the unit to its owner. Defects in workmanship will be determined by JST for limited lifetime coverage.

This warranty does not cover damage caused by accident, misuse, abuse, neglect, unauthorized or improperly performed repairs, alterations, and/or wear and tear occasioned by use

of the product, and does not include any expense or inconvenience or loss of use while the product is being repaired or replaced. JST expressly disclaims any liability for consequential

damages arising from the sale, use, or inability to use the product. Any warranty implied by law, including any warranty of merchantability or tness, is expressly limited to the one (5)

year warranty term for the parts on our ampliers and electronic products. The foregoing statements of warranty are exclusive and in lieu of all other remedies. Workmanship lifetime

warranty is limited strictly to the original retail purchaser of the instrument registered with JST within 10 days of purchase from an authorized JST dealer or distributor. JST will pay

shipping costs to return the unit to its owner within the mainland U.S.

The above warranty policy only applies to customers in USA. If you are an international customer, please check with your distributor and the dealer in your country for warranty

matters. Warranty issues must be handled through your dealer or distributor. If you are an international customer who purchased (or plan to purchase) from a US dealer, we can handle

warranty matters direct but you will be responsible for shipping both ways. We encourage international customers to purchase through your local distributor or dealer for this reason.

Our international distributors are set up to handle warranty issues in their respective countries. If you do not have an authorized Suhr dealer in your country, please contact us direct

for further details.

Rev:022515

SPECIFICATIONS*

Output: 50/25 Watts RMS

Tubes: 4-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 and four Inputs

Rear Panel: Master Volume, two Speaker outputs, Impedance Selector (4Ω, 8Ω, & 16Ω),