I uses the presence at 9. In this way, i give bright to all the head EQ, not using high treble thanks to presence. (High treble sometimes, gives u an horrible feedback in high freq, and Explorers have very sharp sound, you shall be very careful in this matter). Bass to 3 or 4, it depends on where i'm playing. Mids to 6 or 6.5, and treble at 3. Master, at 3 (at 3 with this head you can dig a legion of other amps, i saw it sharing stage with other bands), but if the stage is big, more master..
)))and pre-amp at 9, (This pre-amp, after the modification, gives you enough od for playonly" enough,, not tons of overdrive that makes you sound crappy, (These Crates, or some Mesa pre-amps) without definition or broken body. Pre-amp, at 7, you can sound like Michael Schenker in Stranglers in the night. (changing also some values on EQ) He uses a Flying with Marshall heads (50 watts, 2205 model), and a bit higher (9), like Zakk. These values, maybe with a head without custom works, can be difficult for get. The tone is the original. WE added 2 ECC 83 for pre-amp circuit. Now, have 5 ECC83. I tested a reissue or 2, i'm not sure, but if haven't customized pre-amp, i cannot compare it. Also, i tested them with 1 cabinet only. The sound cannot be compared either, and different guitars. I'll try a Zakk Wylde head soon, with my equipment. I'll know how is ZW model. I know also some 900 heads, the best 900 is Dual Reverb, but isn't enough good for be compared with a 800 (less power and worst tone), DSL and TSL. I disliked deeply a 30 anniversary (purple tolex). I almost bought other 800 stack very cheap, a dude with money troubles wanted sell it to me, and when i went to him with the money, he fixed his trouble..
Now, i guess that Zakk uses now lower mids. I have his reference sound in No more tears, or No rest for the wicked times. Also, he uses different strings, i use 09/46, but he uses very big thickness. Almost 70, in 6ª string. I don't know other stuff that Zakk uses. The hands, dude, are the key. He punish his strings very hard.