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PJL · 19th Aug 2019, 11:13 am

DOES ANYONE HAVE A WORKING BC710 GECOPHONE TRANSFORMER? It would be a great help if you could let me know the primary and secondary resistances.

Taking the area occupied by each turn as 'diameter x2' is going to give an underestimate of turns for a rough wound coil BUT the diameter must include the insulation and I have no idea what that would be. At the moment the old coil is soaking in white spirit as it is a solid lump of bitumen, copper and tape and I can't even get a few metres off it (it may have been Langford Chapter 5 I remember, I'll have a read).

19th Aug 2019, 11:13 am	#8
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Osram Music Magnet 4 DOES ANYONE HAVE A WORKING BC710 GECOPHONE TRANSFORMER? It would be a great help if you could let me know the primary and secondary resistances. Taking the area occupied by each turn as 'diameter x2' is going to give an underestimate of turns for a rough wound coil BUT the diameter must include the insulation and I have no idea what that would be. At the moment the old coil is soaking in white spirit as it is a solid lump of bitumen, copper and tape and I can't even get a few metres off it (it may have been Langford Chapter 5 I remember, I'll have a read).