Diezel Einstein - Chapter Five: Power Ampliﬁer; Tone and Volume of the Power Ampliﬁer; Master Volume; Presence

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Chapter Five: Power Ampliﬁer

5.1 Tone and Volume of the Power Ampliﬁer

5.1.1 Master Volume

! ! As the name suggests, this controls the overall, volume of the ampliﬁer. There is also a

! second, selectable master volume control, which allows volume adjustments via remote

! control device while playing.

5.1.2 Presence

! ! The presence knob controls frequencies over 3kHz. Treble is produced and dispersed in a very

! small beam from the speaker, so be sure to position yourself in the projection area of the speaker

! when making adjustments.

5.1.3 Deep

! ! The Deep Control is an active bass control contrary to conventional bass controls. It

! controls the frequencies around 120Hz without inﬂuencing the overall dynamic range of the

! power ampliﬁer. Diezel GmbH. is not responsible for disintegrating speaker cabinets.

5.2 Power Ampliﬁer Tubes

5.2.1 Function

! ! As the name suggests, the power amp section is the part of the ampliﬁer that produces

! output power, measured in watts. Preamp signals are sent to the power amp(s), which ampliﬁes

! this signal to a level that is acceptable for loudspeakers. Guitar ampliﬁers utilize several different

! types of power amps, which differ in output power and tone. We chose the tube type power

! ampliﬁer for its tried and true performance and familiar tonal behavior.

5.2.2 Selection

! ! Diezel GmbH. installs the most reliable and best sounding tubes that are currently available in

! sufﬁcient quantities. So it is possible that tube brand and tube type will change during

! production. You can ﬁne-tune your Einstein by having different type and brands of tubes

! installed, however, it is imperative that the amp is biased properly. Einstein utilizes 4 power

! tubes, organized in 2 pairs with dual bias possibility. This allows use of 2 different pairs of

! power tubes, either the same or the different types. Yes, this means that in a 4 - tube Einstein,

! you can mix 6550’s with EL34’s, or 6L6’s with KT88’s etc. Cool!

! A quick and a general overview of the most common tube types for the Einstein:

! EL34/6CA7: aggressive, slender low end, higher total harmonic distortion Recommended bias:

! 30-35mA

! 5881/6L6: great tube for clean sounds, good blues tone, also strong bass and excellent clarity.

! Recommended bias: 25-35mA

! 6550: very loud, very good dynamics, strong low end, amazingly percussive. Recommended

! bias: 40-60mA

! KT88/KT100: similar to 6550, but very punchy with great clarity and warmth. Expensive.

! Recommended bias: 35-50m

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