Possibly that could be the case, Richard. I've never owned an SPU so wouldn't know how one is best set-up. I'm glad it's doing the biz for you, though :smoking:
As for the 103, I completely agree. 'Tail-up' it can spit like hell, particularly when there is insufficient mass on the arm and/or headshell. The 103 definitely likes to be completely parallel to the record playing surface - in fact, bang on in that respect.
The Mullard you've got is probably one of the ones I sold Mike before I upgraded to the Telefunkens ;)
Good though the NOS Mullards are, the Teles, IMO, are considerably better (more open, detailed and dynamic sounding, but not bright - less of a 'signature', if you will). If you'd like to try one pop me a PM :)
Marco.

