R Series V1.0 p 8
Middle (with Pull Notch switch)
The midrange circuit has a slight notch in the frequency spectrum at about 550 Hz, and
turning the knob alters the depth of that notch. Its Pull Notch switch shifts the frequency
center of that notch down to about 250 Hz. (For reference, most 1950s tweed amps
have their notch centered at 550 Hz, while classic "blackface" amps have theirs
centered at 250 Hz.) Experiment with this, especially if you're looking for a uniquely
expressive rhythm texture.
Bass
The "chunk" and support that form the backbone of your tone come from this control.
Master (with Pull Ninja switch)
Channel 2 has a special EQ circuit that works in conjunction with the distortion circuit to
sweeten the tone. Therefore, the Master knob's effect goes beyond loudness control.
Try it with different Volume and Middle settings to adjust the amount of "singing" and
"grit." The Ninja Boostª, activated by pulling out the Master knob, is a sweet-sounding
boost characterized by a more subtle effect on the harmonics than Channel 1's Boost
control while adding sustain. The Ninja Boost helps to drive the power amp, and the
best description of its influence over the tone is that it thickens it.
Reverb
In the tradition of classic amps, your R Series amp is equipped with a spring reverb. Its
single-knob operation controls its effect on the signal coming from both preamp
channels. Specially buffered circuitry drives the reverb, keeping your tone intact and
minimizing harshness.
Presence -
Chubster, Suprema, R55-112, and R100-212
The Presence control is incorporated as a vital part of the power amp section. Think of it
as a final brightness control after all the EQ, distortion, effects, and reverb.
Standby -
Chubster, Suprema, R55-112, and R100-212
By turning the Power on and the Standby off (the down position, labeled with a "0"), you
can warm up the amplifier before applying full voltage to the preamp and power output
tubes. This prolongs tube life. Using the Standby switch when you're taking a break also
helps to extend the tubes' life, plus it keeps the amp constantly at the ready. Just flip the
Standby switch to the up ("I") position, and you're ready to play.
Power
This is your main power switch. The on position is indicated by the light being
illuminated. The off position is marked by the "0" on the switch. Before turning the amp
on, always check that a speaker is connected and that the power cord is firmly plugged
into the amp and the outlet.
