Columbia Model 229B 78 rpm Record playing unit

[Radio Fixer]

Here is a model that is earlier than yours: https://www.radiomuseum.org/r/columbia_228.html

If you go on the BVWS site and publications you can download two articles on restoring HMV models which I belive are similar to the Columbia.

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BVWS Bulletin Volume 37, Number 3 (Autumn 2012)

BVWS Bulletin Volume 34, Number 4 (Winter 2009)

Gary