Randall Thrasher Operation Manual

OPERATION MANUAL

Congratulations on the purchase of your new RANDALL THRASHER SERIES Amplifier! We at Randall Amplification appreciate
that you chose the Thrasher 120w head Amplifier and wish you years with tons of gain, great tone and enjoyable playing time.

Engineered by world renowned amp guru, Mike Fortin, this amplifier is the result of countless hours of listening tweaking and
perfecting the tight and relentless attack that the circuit delivers. The design is intended to offer a more focused approach to tube amp
performance than previously available in the market. Drop tuning, 6,7,8+ stringed instruments will translate with pristine clarity while
still maintaining over the top gain and playability regardless of the setting.

Please review the safety instructions below and be aware that the documentation provided in this manual references 120volt USA
versions of the models covered. Note that the POWER listed on the back of the unit should be for your countries’ power standard.

Front and Rear Controls

INPUT JACKS:

Active input changes the

impedance to the first input tube

to better match active pickups.
Passive input for matching the

impedance for passive pickups.

CHANNEL SELECTOR SWITCH:

This switches between channel 1 &

channel two - performs same function as

first button of footswtich

LF GAIN: Frequency selective gain control for bass
HF GAIN: Frequency selective gain control for treble
GAIN: Overall gain control with the sum of the LF and HF gains
BOOST: Tailors the gain voicing of channel 1 only. Sweep from lower to upper gain boost.
Functions is engaged via BOOST or footswitch jack CH/BOOST activating BOOST LED.
VOLUME: Channel 1 volume control to balance output between channel 2. It affects the
SEND level of the FX LOOP. Proper channel 1 volume setting to start to the 3 o'clock position.
BASS: Passive interactive low frequency equalization for channel 1.
MIDDLE: Passive interactive midrange frequency equalization for channel 1.
TREBLE: Passive interactive high frequency equalization for channel 1.
SHIFT: 3 way switch that shifts the frequency point of the tone stack to better match the
amplifier to different speaker types and room sizes.
BOOST: When engaged in channel 1, BOOST control is active for user controlled gain boost.
In channel 2 it is a preset amount of gain boost.

GAIN: Overall gain control for clean channel. Use this control
along with the volume for ranges from crystal clean to slight
break up.
BRIGHT: High frequency boost that becomes less active as
GAIN control is increased.
VOLUME: Channel 2 volume control to balance output between
channel 1. It affects the SEND level of the FX LOOP.
BASS: Passive interactive low frequency equalization for
channel 2.
MIDDLE: Passive interactive midrange frequency equalization
for channel 2.
TREBLE: Passive interactive high frequency equalization for
channel 2.
SHIFT: 3 way switch that changes the voicing of the clean
channel.

DEPTH: Power amp control of low frequency interaction between amplifier and
speakers.
PRESENCE: Power amp control of high frequency variable feedback.
MASTER: Controls the overall output of the amplifier post EQ
STANDBY: Breaks the output tubes cathodes only. Speaker Emulated output still
functions in STANDBY.
POWER: On/off for the mains.

Front Panel Controls