5.1.3 Presence
This knob controls the treble part of the power amps tone spectrum. Its frequency centers
at about 4kHz. 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.
5.1.4 Deep
The Deep control is an active bass control for the power amp that adds low end punch to
the power amp centered at 80Hz. It does not alter the dynamic behavior of the power
amp. Diezel Co. is not responsible for cabinet handles popping out etc.
5.2 Power Amp 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 type of power amps which differ in output power and tone. We chose the
tube type power amplifier for it’s tried and true performance and familiar tonal behavior.
5.2.2 Tube Selection
VH4(S) comes factory equipped with 6550 type tubes. The 6550 tube delivers transparent
tone with good warm tendencies and strong low end. It is possible to use other types of
tubes in the Diezel amplifier. This makes this amp more versatile than most other amps
and allows you to fine tune your rig to your own special needs.
EL34/6CA7: aggressive, slender low end, higher total harmonic distortion
6550: very loud, very good dynamics, strong low end (150 to 180W)
5.2.3 Life Span
Power tubes last 1 to 3 years, depending on care, volume and frequency of use of the
amplifier. If you use your amp only once am month, then the tubes will last longer. Get it?
We have heard tubes that are over 10 years old, but it was not a good thing. Tubes age
very slowly, slow enough for the artist to get used to the changing tone. To keep things
fresh, we recommend retubing, cleaning and biasing once a year if the amp is used
frequently.
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