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-andtrue performance and familiar tonal behavior.
5.2.2 Selection
Diezel Co. 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 can change during production.
5.2.3 Life Span & Tube Fuses
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 a month, then the tubes will obviously last longer. Really… We have
heard tubes that are over 10 years old, but it was not a good thing. Tubes age in a very slow
manner, slow enough for the artist to get used to the changing tone. To keep things fresh and to
keep your tube dealer in business, we recommend re-tubing, cleaning and biasing once a year if
the amp is used frequently.
A failure of the tube fuse is indicated on the amp’s back with two LEDs for each pair of powertubes.
Once the LED is lit, you need to replace the fuse and most probably the tubes, which need to be
rebiased by a tech.
Please note that not all failures will be shown by these LEDs.
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