One point you do need to be aware of with tape adaptors - a lot of decent tape decks have automatic tape slack cancelling. Basically, as you load a tape, the deck fast forwards until it 'feels' the non-driven tape reel start to move, then rewinds slightly in the same way. They do this to get rid of the big slack loops of tape you tend to get sometimes if the tape's been left kicking around for a while. Units that do this aren't compatible with tape adaptors, as the non-driven reel never actually moves in use. Try using one, and the unit'll probably spit the tape back out again after a few seconds, when it considers the (non-existant) tape's in danger of getting chewed.

Dominic

Cambridge Car Audio
http://www.cambscaraudio.co.uk