I am not certain if the Croft Series 3 is pre-1990 but it is there or there abouts. I managed to track down a Series 3 OTL amplifier, with the help of Adrian Parsons at Audioflair, from a serious hi-fi collector who was trying to free up some space. Having dropped and knocked it when I was setting it up I took it back to Glenn Croft to sort out as well as upgrade the output capacitors to a pair of monster ones as well. I got the amp back from Glenn a couple of weeks ago so set it up in my system. At first I was a little disappointed since I felt it was a little dull. However, since then as I have put some hours on it, it has just got better and better. Now I cannot believe how wonderful it sounds! My previous amp was a very well modded Leak Stereo 20 which sounded great with my Quad 57 ELS but the Croft simply does everything so much better than the Leak. Nick at the Emporium told me that he though the bass was a bit light on the Croft - not as far I can hear. The bass is rich, deep and really tuneful. The OTL has a great mid-range reputation and this is bang on - voices are just beautiful and the treble is extended and detailed. Transients such as cymbals are like nothing I have every heard before they are so fast and dynamic. All in all I am incredibly happy with my purchase and even though my wife will never believe me this is the amp that will see me out!!! If anyone is in the York area and wants a treat for the ears do drop me line so you could come round and hear it.