Two-Rock Cardiff 15 User manual

OWNER’S MANUAL

Dear Customer,
Thank you for your purchase of a amplifier from Premier Builders
Guild.
As a discerning guitarist, you know the road to great tone begins with
great components.
Our Classic Design, carefully selected parts and hand-built approach
combine to make an extremely versatile instrument.
Please take the time to read this manual. We hope it will answer any
questions that you may have.
We extend a warm welcome to you as a member of a select group of
musicians who have chosen a amplifier.
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, plugs, and the point
where they exit from the apparatus
9. Protect the power cord from being walked on or pinched particularly at plugs and the point
where they exit from the apparatus
10. Only use attachments/accessories specified by the manufacturer
11. Unplug this apparatus during lightning storms or when unused for long periods of time
12. Refer all servicing to qualified 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
or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped
13. 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.

Front Panel Functions
1. Input Jack- High impedance input to the amplifier. Plug in your instrument here.
2. Bass Control- Adjusts low frequency response. In the fully counter-clockwise position,
Low frequencies are cut. In the fully clockwise position, all low frequencies present are amplified.
3. Treble Control –Adjusts the preamp high frequency response. In the fully counter-clockwise
position, high frequencies are cut.
4. Volume Control –Adjusts the overall output of the amplifier. As the control is rotated
clockwise, the volume of the amp will increase until approximately the 2 O’clock position.
The volume may not increase past this point, but the amplifier will become more overdriven and its
sound more harmonically rich.
5. Contour Control - The contour control is an active wide band sweep. In the 12 o’clock position,
the amp’s frequency response is flat. Counterclockwise rotation reduces high end response and
increases low frequencies. Clockwise rotation decreases low end and increases the high
frequency response. This control is very useful for maintaining preamp tone control settings, while
allowing a global adjustment to compensate for differences in room acoustics, speaker cabinets,
or bright to dark guitars (PRS Humbucker to Strat, for example). This control also actively reduces
the articulation available, allowing a softer setting or extremely open and revealing, depending on
your individual style and requirements.
8. Standby- This switch has 2 positions, Standby and Play. In the Standby position, the high
voltage in the amp is cut, rendering the amplifier muted. In the Play position, the amplifier is fully
on and ready to be played.

Rear Panel Functions
1. A/C Input- Connects the amplifier to A/C power via the power cord supplied. Unless otherwise
specified, your amplifier is designed to operate on 120 volts A/C, 60 cycles.
2. Fuse- See Fuse Chart
3. Power Switch- Turns power on.
4. .Speaker Output Jacks- There are 2 speaker output jacks. Nominal impedance is 4 or 8
ohms. NEVER OPERATE YOUR AMPLIFIER WITHOUT A PROPER SPEAKER LOAD
CONNECTED. Be sure to match the impedance of your cabinet with the impedance (output) of
the amplifier.
5. Effects Loop- This is a passive effects loop, designed for use with a simple reverb or delay
pedal. It is not typically recommended for large pedal chains, as the signal loss can become too
great without the use of a buffer and high frequency response and dynamics will be reduced.
Because the loop send is post-volume, it’s also recommended that you verify that your effects are
capable of seeing line level signals at the Cardiff’s higher volume settings (in excess of 3 Vp-p).
Undesirable distortion can sometimes result, and in extreme cases, damage to the effect unit
depending on the unit and the volume level of the amp.
9. S/N- Your serial number is located here.
Fuse Chart
All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100 Volt Domestic Fuses: Export 220, 230, 240 Fuses:
2 AMP 2 AMP 1.6 - AMP

(Tube Complement)
V1: 12AX7, Input Stage and 2nd Stage
V2: 12AX7, Phase Inverter
V3-4: EL84 - Power Tubes
V5 : EZ81 –Rectifier Tube
Each fine production tube is tested and matched to our exacting specifications. The power section
is self-adjusting cathode biased and hence no adjustment is necessary with most power tube
pairs.

WARNING! No user serviceable parts inside! Refer to qualified service person only.
LINE CORD- For your safety, connect to a grounded A/C receptacle only.
amplifiers are brought to you by Premier Builders Guild.
We know your new amplifier will provide many hours of enjoyment and
inspiration in the years to come. This manual is a resource for some of your
questions. Please contact us with any other questions or comments that you may
have. We look forward to hearing from you!
PHONE: [phone]-TONE (8663) (M-F 9am-5pm PST)
FAX: [phone]
ADDRESS: Two-Rock
619 Martin Avenue, Suite 6
Rohnert Park, CA 94928
SERVICE: [e-mail]
WEB: www.two-rock.com
PRECAUTIONS:
DO NOT expose to rain or any other moisture.
DO NOT use cleaning solvents. Wipe exterior with a clean, dry
cloth only.
Refer servicing to a qualified service technician.

This is a product of
Premier Builders Guild
619 MARTIN AVENUE, SUITE 6
ROHNERT PARK, CA 94928
707-584-8663
www.two-rock.com
SERIAL NUMBER: _____________________________