Early versions of the Dansette Viva were fitted with the BSR TC8H mono cartridge (orange body) and Stereo records (most certainly Stereo LPs) should not be played on this. Await your photo so as to advise you further.
Regarding the Hum on this, I'm not quite sure what is meant when you say this has been "earthed". The Viva was only made with a 2 core mains lead, so we must asssume there is nothing that is connected to the Mains earth.
When you say that "someone has earthed the wiring" this may have caused what is known as an "earth loop". We might need photos of the amplifier and how it's connected to the turntable underside tag strip.
These Vivas tend to hum more than most other Dansettes of the time due to their very crude amplifier circuitry.
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Edward.
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