Instruction Manual

Congratulations on purchasing this incredible new
guitar amplifier designed by one of the most well
known amp modders and designers in the LA
Music scene for the past 20 years, Dave Friedman.
Dave Friedman’s Dirty Shirley 40 Watt Head was
designed for guitarists that want a Vintage Classic Rock
tone inspired by British tube amps from the 60’s and
70’s. And what’s better than one Dirty Shirley? TWO
DIRTY SHIRLEYS! Introducing the Twin Sister.
It is based on a modified JTM 45 but still delivers the
signature British tone for which Friedman is best
known. The Twin Sister is a 40-watt, 5881 powered,
dual channel amp with two identical channels that can
give you everything from gorgeous sparkling cleans to
a glorious vintage crunch and beyond! Extremely
versatile, it is capable of producing many styles of
music from blues to rock and country by just adjusting
the structure, gain and master controls.
The Twin Sister features all the beautiful finishing and
solid construction that you would expect from a
Friedman amplifier. Designed to take pedals and loves
boosts, OD’s, phasers, flangers, tremolos and wahs,
while the ultra-transparent series effects loop handles
your time-based effects pedals and rack units.
The Twin Sister from Friedman Amplification, a real
screamer and she fits in your backseat!
• Hand-wired in the USA
• 40-Watt all tube head
• Two-Channel channel
• Bright Switch and 3-position Gain Switch
per Channel
• 2 x 5881 power tubes
• 5 x 12AX7 preamp tubes
• Gain, Master, Bass, Middle, Treble per
channel
• Global Presence and Deep knobs
• Three position gain structure switch
• Ultra transparent series FX loop
• 4, 8 and 16 ohm Impedance selector
switch
• Custom USA made transformers
• Limited Lifetime Warranty
• Dimensions: 8.5" (D) x 24" (W) x 9.5"
(H)Weight: 32 lbs.
PLUGGING IN
We recommend starting the amp with the Bass on
6, the mids at around 7 or 8 and the treble and
presence at 5. Set the gain around 6 and then
bring the master to taste. After plugging in, you
will notice instantly, the tight bottom end and rich
harmonically detailed chords and single notes,
that’s the Friedman sound. This amp cleans up
remarkably well with the guitar’s volume control
even with the amp on higher gain settings.
The Twin Sister was primarily designed as a
Classic Rock style amp. The Twin Sister will
surprise and impress you with all the different
tones available. If you want a classic rock sound
from the 60s and 70s, the Twin Sister might just
be your type of amp. Please visit the Friedman site
for video tutorials on the Twin Sister and sample
settings.
We know you will love your new Twin Sister. If you
have any questions or need help don’t hesitate to
email us at [e-mail].