i'm looking into a sunn head. its a sunn 200s/sorado. i was wondering if anybody had a sunn or knows anything about it. is it a good pickup? and also, what is the ohm output on it? i have a ampeg 410he and a hartke 210 transporter both at 8 ohms. i've been looking into other older tube heads and they were all 4 or 2 ohms.