Technics turntable plays but no sound with Sherwood receiver

I have an approx. 25 yr. old Technics turntable SL-BD35 that works fine with my similarly old Technics receiver. The receiver has been cutting out recently (another problem that I could use some help with) so I purchased an Sherwood receiver RX-4103. This receiver supports my CD and cassette players but has no phono ports so I connected the turntable to aux. The turntable plays but no sound comes through the speakers unless I really crank the volume. I tried all the other ports; CD, tape, TV/VCR but the same result. I tested the turntable again on the Technics receiver (while it lasted) and it still works fine. Is there anything else I can try or, for some reason, will the Sherwood receiver not support a turntable? Thanks.