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The Rock Block is a 1 watt vacuum tube guitar amplifier that can also be used as a
distortion/boost pedal. It provides classic overdriven output tube sound at reasonable
volume.
INPUT:
This ¼" mono jack is used to connect to a guitar or the output of an effects
pedal.
SPEAKER:
This ¼" mono jack is used to connect to a speaker cabinet. The Rock Block
can drive speakers of 4 to 16 ohms impedance.
OUTPUT TO AMP:
This ¼" mono jack is used to connect to the input of another guitar
amplifier or effects pedal.
12V DC:
This 5.5/2.5mm jack is used to connect to the supplied external power supply.
This supply is 12V DC (center positive) and is regulated and current-limited. Only this
type of supply should be used.
POWER:
This is the ON/OFF power switch. Push to the right to turn on the amplifier.
The vacuum tubes will glow blue to indicate that the amplifier is turned on. It will take 5-
30 seconds for the vacuum tubes to warm up.
GAIN:
This knob is used to control the gain of the amplifier.
TONE:
This knob is used to control the treble response,
VOL:
This knob is used to control the output volume of the amplifier.
BOOST:
This 3-way switch is used to boost the gain of the amplifier. The left position is
the lowest gain, the center position is medium gain, and the right position is maximum
gain.
BASS:
This 3-way switch is used to control the bass response. The center position is for
the least bass, the left position is for medium bass, and the right position is for maximum
bass.
OUT VOL:
This knob is used when the Rock Block is driving another amplifier to control
the volume to the OUTPUT TO AMP jack.
BYPASS:
This footswitch is used to bypass the Rock Block when driving another
amplifier. If the green LED is OFF the Rock Block is bypassed, and the INPUT jack is
connected directly to the OUTPUT TO AMP jack (true bypass).
Owner's Manual
Revision 1.0
Description
Inputs and Outputs
Controls
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Table of Contents
Summary of Contents for Rock Block 12AT7
- Page 1 Owner’s Manual Revision 1.0 Description The Rock Block is a 1 watt vacuum tube guitar amplifier that can also be used as a distortion/boost pedal. It provides classic overdriven output tube sound at reasonable volume. Inputs and Outputs INPUT: This ¼” mono jack is used to connect to a guitar or the output of an effects pedal.
- Page 2 The output volume of the Rock Block, when used as a distortion/boost pedal, is controlled with the OUT VOL knob. The BYPASS footswitch is used to bypass the Rock Block. All other controls are used in the same way as when the Rock Block is used as an amplifier to drive a speaker.
- Page 3 (OUTPUT TO AMP jack) Warranty and Repair The warranty period is 2 years. If during the first 2 years the Rock Block needs repair, Surprise Sound Lab will repair or replace the Rock Block at no charge. The vacuum tubes are guaranteed for 90 days. The owner will be responsible for shipping charges.
- Page 4 Voice Switch The 3-way switch on the left side of the Rock Block, next to the OUTPUT TO AMP jack, is used to select the type of sound (voice) when the Rock Block is used as a distortion pedal. The center switch position selects a "vintage" sound, which is the same as the sound when the Rock Block is used as an amplifier.
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