The Talking Machine Forum — For All Antique Phonographs & Recordings

Hi
I'd like to know the correct way to adjust this style of sound box.
How much tension is put onto the two springs? Does the sound change with different tension? Cheers

Tighten the two screws up until the springs only just start to offer resistance. Any more than this and the needle bar will be unable to move freely, resulting in major damage to your records.

Thanks for the information
Cheers

Look at the diaphragm from the side, in good light, to make sure the surface of the mica is flat... not concave or convex.