New Holland Series 70 tractors: Powered by 7.5-litre six-pot engines through 18F/9R Funk transmissions, the 170-240hp New Holland Series 70 tractors were first introduced into the UK in 1994 and, apart from the last 70A models, they changed little throughout their production run. So, today, are they too dated to consider ‘used’? James de Havilland reports