I ordered a collection pack (Ilaiyaraaja - The passion of the early years) and it comes with 4 CDs. They contain songs from films like Johnny, Guru, Priya, Annakili, etc. I need to thank visvan sir for sharing the link.
I have listened to a couple of CDs from that pack and the recording quality is decent for few tracks, average for some and superb for other tracks. I found Guru and Priya recording quality to be top notch. Naturally it would be unfair to expect the tracks recorded in early and mid 80's to have the recording quality of the current ones. Of course there are few exceptions to that.
A little bit off the topic here. I wanted to share my thoughts on this topic of recording quality. It may not be correct or acceptable for others, but perhaps I want to register here. If you are not convinced with my points here, please accept my apologies in advance. I am personally not comfortable when few of us (at least Ilaiyaraja fans) keep harping about the recording quality of the old songs recorded in early/mid 80s. The moment we start comparing with the modern recordings, we will only end up with disappointment. May be, we (including myself) are inherently assuming that the recording quality of the 80s should match or reflect the stature of the hi-fi audio components we currently own. My very personal opinion is that we shouldn't assume that way.
In my case, I just wanted to listen Ilayaraja's compositions irrespective of how well it was recorded and I wanted to hear them through an audio CD rather than through mp3. I will say the mp3 tracks of those tracks recorded in 80s sound very much horrible.
Hope I am not offending anyone.