Try using the phono input on the Sony instead of the internal phono on the Technics. The speaker wires do not have to be bound together. BTW, you do not hook up the ground wire if you are using the internal phono on the Technics!
Note
• When you connect a turntable with a PHONO/
LINE switch, be sure to set the PHONO/LINE
switch to PHONO.
• This receiver equipped with Phono Equalizer
amplifier to meet MM type PHONO cartridges.
MM type cartridge used on turntable have a
variation of audio output level. In case MM type
cartridge output is small, you can use phono
volume offset to increase the level (page 28).
• To record the sound from the receiver, you must
connect your device to the AUDIO INPUT 4 OUT
jacks