Good Afternoon to all, hope you are well, bright sunny day in N.East again today!
Thanks very much for your helpful comments. my hum on the TEAC may be more complex, since when I first switch on to start the days recording, there is NO hum. Later on in the day the hum seems to 'appear'. I shall monitor it now obviously to see if it appears after a set time or similar.
I have already tried moving the mains cable and USB connections as far away from each other as possible but the fact that the hum appears to be intermittent is very strange, unless the TEAC motor develops a hum after being on for several hours.
I am going to see if the Phono output is affected in the same way at some point too.
I was aware that the TEAC did not have a ground earth socket, which I thought was unusual but I can probably fix one up to see if it helps!
I was going to buy the Audio Technica AT-LP5X Turntable but it was out of stock when I was buying!
Thanks for all your help anyway.
Noise on optical recording
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Please state which version of macOS you are using,
and the exact three-section version number of Audacity from "Audacity menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.