Studio Pro 35
Studio Pro 35
Studio Pro 35
Dear Customer,
As a discerning guitarist, you know the road to great tone begins with
great components.
Please take the time to read this manual. We hope it will answer any
questions that you may have.
1. Input Jack- High impedance input to the amplifier. Plug in your instrument here.
2. Push/Pull Treble Control- Adjusts the high frequency response. In the full counter-clockwise
position, high frequencies are cut. In the full clockwise position, high frequencies are allowed to
pass to the gain stage. When the knob is in the “out” position, the high frequency response is
boosted. This is most effective when the input gain is set at 12 o’clock or lower. The effect is less
dramatic as the gain control is adjusted past the 12 o’clock position.
3. Push/Pull Mid Control- Adjusts the mid-range response. In the full counter-clockwise position,
the tone will be somewhat “scooped” of mid-range response, emphasizing the highs and lows. In
the full clockwise position, mid-range frequencies are allowed to pass to the gain stage. When the
knob is in the “out” position, the EQ section is passively bypassed boosting the natural high and
mid frequencies of the guitar. It also increases the amount of input signal that drives the gain
stage.
4. Push/Pull Bass Control- Adjusts the bass response. In the full counter-clockwise position, low
frequencies are cut. In addition, the response of the treble and mid-range controls is greatly
reduced. In the full clockwise position, low frequencies are allowed to pass to the gain stage.
When the knob is in the “out” position, the low and low-mid frequencies are boosted. This is a low
frequency contour switch, changing the low and low-mid response.
5. Gain- Adjusts the overall gain of the amplifier. Start with this control in the 12 o’clock position.
6. Master Volume- Adjusts the output level of the amplifier. Also acts as the send level control for
any effects inserted in the loop.
7. Reverb Send- The reverb drive control determines the amount of signal applied to the reverb
tank. Low settings will create a very open, small room reverb effect with a short decay time.
Advancing the control clockwise increases the signal applied to the driver and a very saturated
effect with a sharp attack and a long decay can be obtained.
8. Reverb return- The reverb return control mixes the reverb effect signal with the dry signal. At
full counterclockwise rotation, the reverb effect is defeated. Using the return control in conjunction
with the reverb drive control, a wide range of natural reverb effects can be produced.
9. Contour- The contour control is an active wide band sweep. In the 12 o’clock position, the
amps’ 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.
1. A/C Input- Connects the amplifier to A/C power via the power cord supplied. Please check to
make sure you have the correct cable for the voltage rating of your country.
4. Speaker Output Jacks- There are 3 speaker output jacks; 4, 8, and 16 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. Return Level- This control has a pull-bright function. The loop is active in the circuit even with
no effects connected, so the level control acts as a master volume. The pull-bright feature is useful
when playing at low volume (a low fx control setting) or when a large number of outboard effects
are used in the loop, which sometimes causes high frequency insertion loss.
6. Effects Send- Use this jack to send the amplifiers signal to outboard effects.
7. Effects Return- Use this jack to connect the output of your effects to the amplifier.
8. Pickup Loading- This control has 5 settings. In the first position (fully counterclockwise), there
is no additional pickup loading, with 4 additional settings available. Fully clockwise (last position) is
full loading. Loading the guitar pickup(s) to varying degrees changes the impedance relationship
between the pickup and the amplifier’s first gain stage. Loading reduces inductive “ringing” in the
pickup coils. The effect is a more controlled high frequency response and a reduction in high
frequency artifacts produced when a pickup’s magnets and coils feed back with each other,
usually at or near the pickup’s saturation point. The damping effect will also reduce the gain, which
is normal. Tonally speaking, reducing these artifacts results in a cleaner waveform and an
apparent lack of harshness in the upper frequencies.
Export 100 Volt Domestic Fuses: Export 220, 230, 240 Fuses:
2A – 35 Watt 2A – 35 Watt 1A-35 Watt
(Tube Complement)
TEST POINT
V7 V6 V5 V4 V1
BIAS Pot
V3 V2
It is recommended to only use exact replacement tubes similar to what is installed at the factory.
Below is a limited list of comparable tube types:
Bias Ranges: Are measured and set in Volts. But can be measured and set in milliamps.
Numbers given are for 2 tubes combined.
6L6 and type tubes: .060v to .070v for 35 Watt Factory Setting: .064v
6V6 and type tubes: .040v to .050v for 22 Watt Factory Setting: .047v
Do not set bias higher then recommend levels as it can lead to tube failure possible
damage to other components in the amplifier!
WARNING! No user serviceable parts inside! Refer to qualified service person only.
LINE CORD- For your safety, connect to grounded A/C receptacle only.
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!
ADDRESS: Two-Rock
619 Martin Avenue, Suite 5
Rohnert Park, CA 94928
SERVICE: service@two-rock.com
WEB: www.two-rock.com
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