A FEW COMMENTS ON TUBE AMPLIFIERS
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Be sure to read this section before powering the amp up!
This amp´s input is extremely sensitive due to its high gain factor. In combination with inherent
microphonics of tubes, at certain settings this can elicit powerful feedback from the speakers –
even without a guitar being connected!
This occurs primarily when Crunch and Lead channels (that is, all channels whose preamp is easily
overdriven) are activated and the following settings are dialed in:
-
Gain and / or Lead Gain knob past the 12 o´clock position
-
Treble knob past the 12 o´clock position
-
Crunch / Lead Volume knob past the 12 o´clock position
-
Presence knob past the 12 o´clock position
Avoid setting the afore mentioned knobs to extreme positions (that is, combinations in which
several of these knobs are set past the 12 o´clock position). This type of configuration can cause
considerable feedback that could severely damage your hearing and destroy speakers.
If you set the Volume or Master knobs to higher volume levels, always make sure to back off
amplification levels to prevent feedback by turning the Lead channel Gain knobs down. The same
applies to these channel´s Treble and Presence knob settings.
Before you power the amp up, take a moment to check out the control panel and make sure that
these knobs are not set to any configuration similar to the one described above!
A FEW WORDS ON BACKGROUND NOISE IN TUBE AMPLIFIERS
You may hear slight background noise right after you power a tube amp up or even while you are
operating. It manifests as intermittent hissing or sizzling, crackling, or popping noises. Caused by
tubes, this type of noise may even occur with brand new tubes.
The noise is particularly noticeable in high-gain Lead channels. This is because the Lead
channels provide a very high gain factor, amplifying noise along with the usable guitar signal.
It is not necessary to swap tubes if you encounter this kind of noise every now and then, though you
may consider replacing tubes if it becomes a constant companion.
Summary of Contents for Ironball SE E606SE
Page 1: ...E606SE Ironball SE Operator s Manual...
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