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Old 18th Feb 2014, 8:56 pm   #7
knightley
Triode
 
Join Date: Jan 2014
Location: Woking & Kingswood S.Glos. UK.
Posts: 27
Default Re: HMV and Columbia soundbox identification

Further to Barry's information, there are 2 versions of the Columbia No.9. One with a domed front and one with a truncated cone front, the latter were also fitted to the plano-reflex tonearm in portables at least.

I have also added photos of a couple of diaphragms. An HMV No.5b and a Columbia/HMV No.15.
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