Rising Farce said:
As we apparently have some Iommi-tone experts here, I'll ask: Does anyone know what he used during the Dehumanizer era? Was it the GH100TI, or was that introduced later? I've always liked that sound, but I've been unable to approximate it with a module.
The GH100TI was introduced later.
I believe Tony was still using a single-channel Laney "AOR Series" at the time. Also remember that Tony was using "The Old Boy" SG built for him by John Diggins (JayDee) with custom-made hand-wound and hand-epoxied pickups.
In interview, JD couldn't remember how he made the pickups but they have something crazy like 20 to 24mV DC resistance. Gibson benched them and attempted to make a repro, and according to Tony were able to convincingly do so. I do have a Gibson Iommi humbucker but have never installed it on anything. Another interesting thing to note is that, if I remember correctly, either Iommi, or his guitar tech said to use a 1Meg volume pot for the humbucker instead of the usual 500k to let more highs through. You might want to consider that.
Iommi may be on a bender for more and more treble due to the ends of his fingers being chopped off and the leather pads he has in their place. He may be compensating for dulling that the leather could be doing.
Finally, Tony uses 8's and didn't tune down for "more heavy", but because standard tuning hurt his fingers too much.
You may need to do more than have a module for the
Dehumanizer sound. You may have to have a guitar set up (pickups, pots, strings) and a treble booster in the chain for that sound. Hope that helps.
BSM Iommi Treble Booster
Analogman Beano Boost (with Iommi story)