I just won an auction for this VOX Berkeley Super Reverb. It's the first run all tube model. I think (?) they came out in '65 or '66, and were replaced by the S.S. Berkeley II. Anyway, I've heard 2 of these tube models and both just rocked. I haven't received the amp yet but the seller did play it for me and the reverb and vibrato both work excellently. The amp looks like it just came off the showroom floor and has obviously seen light duty. Does anyone have any experience with these or have any history on them? What speaker impediance do they need to see? Selectable? I have a pair of '64 VOX Alnicos I'll use the amp with. Any info is greatly appreciated.