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.pickup.construction...
Thanks to Stephan Moeller for producing frequency response curves for the Blues90 pickup in a variety of settings.
Blues90 pickup alone, in combination with another Blues90, and the dummy coil
Upper Blue curve = bridge pickup alone - this combination does not occur "naturally" in a BluesHawk
Red curve = bridge pickup & dummy coil connected in series
Lower Blue curve =bridge & neck pickups combined in series, with the treble bleed network (Gibson R-C decoupling) between the bridge and neck pickups
The Blues90 pickups used in the neck and bridge positions are identical, so the frequency response is the same for both pickups - it is the variation in position along the length of the strings that changes the tone of the different pickups.
Blues90 pickup at Varitone settings 2-6 - remember setting 1 is the pickup alone, "untreated"
These curves accord very closely with Gibson's published performance figures for the Varitone circuit...
 | Position 2 : -5dB at f0=1875 Hz |
| Position 3 : -6dB at f0=1090 Hz |
| Position 4 : -7dB at f0=650 Hz |
| Position 5 : -10dB at f0=350 Hz |
| Position 6 : -14dB at f0=130 Hz |
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