Overall amp tone; deep-normal-bright.
A 3 position switch gives a choice of three overall tones.
The deep setting boosts lows and cuts highs by a few dB.
Fig. 4 “deep”
The normal setting is fairly flat (-3dB bandwidth 50 Hz to 10 kHz).
Fig. 5 “normal”
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5
"deep" tone setting (tone controls flat)
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frequency Hz
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"normal" tone setting (tone controls flat)
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frequency Hz
amplitude dB