Introduced at winter NAMM 2006, the TR evolution of the J-Drive integrates even more functionality and tonal variations into the
combined drive and clean boost concept.
In the clean boost section, the TR has an independently switchable clean boost consisting of a Vishay JFET and germanium (NOS mil
spec NPN 2N388 JAN's) booster that can be changed to a much higher gain germanium only 'treble booster' by pulling up on the boost
section gain knob.
Turning on both the treble boost and drive circuit together gives some amazing lead tones with just the right touch of germanium
sizzle. We've also added a cool transformer output stage to the overdrive section - it has a wonderful smoothing effect on the upper
mids and highs, placing an inductive source impedance at the amps input as a guitar's pickup would (but at a lower output impedance so
it works great into other pedals as well as amps).
Our 'Close Asymmetry' overdrive circuit utilizes a Schottky barrier diode for smooth asymmetrical clipping - which combined with the
transformer output gives a liquid smooth sustain with punch. We've also added a toggle switchable high frequency shelf filter to add
extra 'bite' when needed.
Specifications:
true bypass signal path for both the clean boost and drive sections
discrete clean boost circuit with JFET input/germanium drive, transformable to a higher gain germanium only treble booster by pulling
up on the clean boost gain knob
premium audio components, including 2% polypropylene capacitors, 1% metal film resistors and a Burr Brown OPA2134 opamp
NOS 2N388 JAN germanium transistor
post-volume control overdrive transformer output stage that smooths upper mids and highs
'Close Asymmetry' Schottky diode clipping circuit
switchable highpass shelf filter for additional 'bite', implemented without additional active components
battery or standard negative tip 9V DC adapter operation
To download the diamond j-drive mk3 user manual as a pdf file, please click here.
