There were a few years apart between my experiences of the delta and Stereo 70's. The Stereo 70 was in a slightly larger case I remember and the one I used sounded very close to a NAD 3020. The Delta 70 I had previously was a dog's dinner in comparison and I didn't care for it at all. All a long time ago now and both would need substantial fettling to get them to par..
make sure you use the phono 2 input (the less sensitive one), as the overload margin is tiny on the more sensitive input - around 35mV I remember..
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me