UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - AKAI GXC-46D Cassette recorder/player

teetoon · 21st Nov 2017, 3:19 am

Hi, it's certainly worth trying the ground loop theory. When I had Akai machines in the past I always disconnected the earth wire on the Akai's mains plug to stop hums when they were connected to a system.

That's assuming it is a loop because the amp you're using is earthed already. An easy test would be to pull the phono plugs half way out so only the centre pin is making contact in the socket and see if the hum changes. Ofcourse if your amp does not have it's own earth then this won't apply.

I don't know why there would be a difference in the channels but anything's possible with the high gain preamps and one side could just be a bit closer to the mains TX or the motor.

David.

21st Nov 2017, 3:19 am	#15
teetoon Heptode Join Date: Dec 2010 Location: Barnstaple, N.Devon, UK. Posts: 557	Re: AKAI GXC-46D Cassette recorder/player Hi, it's certainly worth trying the ground loop theory. When I had Akai machines in the past I always disconnected the earth wire on the Akai's mains plug to stop hums when they were connected to a system. That's assuming it is a loop because the amp you're using is earthed already. An easy test would be to pull the phono plugs half way out so only the centre pin is making contact in the socket and see if the hum changes. Ofcourse if your amp does not have it's own earth then this won't apply. I don't know why there would be a difference in the channels but anything's possible with the high gain preamps and one side could just be a bit closer to the mains TX or the motor. David.