Thanks for the interest and comments guys . . that's one of the great things about basschat . . people are interested enough to make the effort!! Of course I agree with your comments . . and the rig has never let me down and never needed any repair.
It's the last of a long line of all-valve amps I have used. Beginning with a couple of Selmer Treble & Bass 50s (into 2 x Marshall 4 x 12s), then the Marshall 100 head (don't remember model no. but would have been circa 1968!), then an orange Sound City 200 Stack with 2 x 4 x 12s (never liked it!!), then a couple of Hiwatt DR103s with a 4 x 12, (then a brief sidetrack to an HH "solid state" top, soon saw the error of my ways!), then the 1977 Hiwatt DR103, then the 1993 Trace Twin!!!
So I'm not one for change generally!!! But as mentioned earlier I eventually got myself into the new century with the Streamliner 900 and 2 x Bergantino 12s . . impressive clarity . . so far so good!!!