Diezel Einstein - Two Pre-Amplifiers; Pre-Amplifiers and Their Jobs; Channel One Details; Channel Two Details

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Chapter Four: Two Pre-Ampliﬁers

4.1 Pre-Ampliﬁers and their Jobs

! ! The Diezel Einstein comes equipped with 2 different and totally independent preamps.

! This allows the artist to play through nearly all musical-styles without having to make major

! changes to his/her ampliﬁer. The preamps are voiced to deliver the most wanted guitar tone

! ﬂavors: Clean, Crunch, Heavy, Lead. This design concept delivers stellar guitar sounds with

! excellent playability, warm dynamics and razor sharp equalization possibilities. The tone

! controls work in an unusually wide range, so a little adjustment does quite a lot. As with so many

! things, less is often more. We suggest you start exploring the channels with all controls set to

! 12:00 o’clock, and the master volume just slightly cracked open. (To avoid hearing damage)

4.1.1 Channel One (low to medium gain)

! ! Clean Tone is a very sensitive subject, because there are so many different ideas on how a

! clean amp should sound like. Clean tonal textures require much higher dynamic range than

! distorted sounds. From hard and percussive sounds to soft, warm, and blossoming tone. Einstein

! was designed to offer as many of the clean varieties as possible. Your choice of guitars and

! pickups will have a large part in this equation.

! ! Channel one has three modes, selectable by a toggle switch near the channel one gain

! knob. The modes pre-select different gain stages in the pre-amp, allowing this channel to span

! the range from extreme clean to a heavy crunch. A player that does not require a clean channel

! can use these modes for alternate distortion sounds.

4.1.2 Channel Two (high gain)

! ! This channel is voiced for single notes, or for very heavy and massive rhythm guitar. Due to

! its slight midrange accent and very high gain, it possesses a good punch, will play with ease, and

! gain authority to rule any stage, or studio. The “less is often more” rule applies here also.

4.2 Pre-ampliﬁer Tubes

! ! The pre-amps are equipped with 12AX7 tubes in all positions. The pre-amp tubes are not

! designed to produce high power output. Therefore, their life expectancy is much higher than that

! of the power ampliﬁer tubes. This is not to undermine their utter importance in overall sound and

! response of the ampliﬁer. Also, annoying defects like crackling noises and low dynamics are

! directly related to defective pre-amp tubes. Like all other tubes, 12AX7 tubes come in many

! different gain stages, and offer a wide variety of tonal behavior. Our choice for production was

! made to ensure a wide variety of tones, with low! noise and good reliability.

4.2.1 Micro-phonics and Bad Noises

! ! The overall performance of pre-amp tubes is easily inﬂuenced by external mechanical

! factors. Malfunction in these external components will manifest themselves by a sudden,

! high-pitched feedback sound. The input stage is especially suspect to these phenomena. If one

! encounters microphonic tube behavior, then the ﬁrst tube should be checked as a rule. Pre-

! Ampliﬁer tubes can also cause a hum or other bad noises, like crackling or ticking.

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