Managed to tame the "fruity" bass, was in fact the amp I'm currently using [also a Technics
] Re-capped it yesterday out of necessity as the reservoir caps were leaking quite badly it wasn't safe to use... Anyway, whilst in there I swapped the positively ancient and awful 4558 opamps out for some equally ancient but not so bad sounding 5532's - I wanted to try my usual LM4562 but the power supply voltage is too high for them, could put a diode in series with the +/- supplies but couldn't be arsed.
Objectivists say opamps all sound the same, well these weren't even in the signal path & you'd have to be deaf as a post not to notice a difference. Much cleaner sound now