Electric guitar...

toolmanmike said

I have a few half speed Masters (LP's) but I don't think I have broken the seal and put them on the turntable.

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That's not the way that works.

The master recording process was done at half, speed increasing the quality of the recording.

Usually this creates the need to have double the amount of media.

IE a single disk master recorded at "normal" speed would need two disks mastered at "half" speed.

It still plays at the same RPM setting on the phono.

I have seen a few "half speed" masters of 45's on 33 sized disks and some 33 sized disks that play at 45.