These are pretty rare, so rare I only have two. This is the in better condition of the two, was merely neglected rather than beat, so it cleaned up well. I've loaded it with 6550 taken out of my Matamp (as put in by Matamp, which I guess is a recommendation), seems happy on these, although should have KT88, I assume it runs them pretty easy due to the 150w part. anyway, passive preamp, not the MKIV one with the undeserved bad rep, the other one is my favourite amp at current, which is a position with a lot of competition (Matamp doesn't have it due to being a slave). I've also replaced the electrolytic filter caps, and uprated them, for a bit more headroom in the lows.
[IMG]http://i17.photobucket.com/albums/b69/Incarante/Soundcitybass150front.jpg[/IMG]
After £550 for it.