@lewm : Philips had not much sucess with its cartridges. As a fact I knew Philips on cartridges thank's to the " euphoria " to discovery new MM cartridges in that long MM thread and I found out my sample GP 412MK3 through ebay. No other gentleman before me posted northing about Philips.
Well the GP 412MK3 is really good quality performer and Philips said that the cartridge magnet is : " magnet steel " and the cartridge is a MM with an unsual low output for a MM of mere 1.3mv.
This Philips and the Micro-Acoustics is worth to listen it and especially the GP 412MK3 not so easy to find out ( I still own it. ).
R.