ahaa..
i am a bit annoyed with the time lost herer but... of the 4 tapes i bought the one i was using to test the JVC is the one that has a problem..
i was repairing the old audioline radio/cassette in the car and used the same tape only to have it play slow/wobbly .. stuck in a different tape and all is fine..
so stuck the other tape into the JVC and voila... all works!... grrrrrrr
it was a 70's - 80's compilation tape that was the cuplrit....
the JVC has noticeable distortion, this maybe capacitors drying up or the speakers maybe a bit rough.. it isn't bad enough to worry about though, just noticeable by somebody who who works in elecronic product design
Ordered some blank tapes, TDK MA/SA 90's and will make my own 70's - 80's compilation on the technics RS-AZ6 that i recently purchased
Cheers
BIll