Field Coil Speaker
 

Are field coil speakers manufactured today?
The defective speaker got tossed in a clear-out. It was defective.
I believe that it was of 5" diameter.

Re: Field Coil Speaker
 

Hi Neil,

Field energized speakers become obsolete many decades ago, the improvement in magnet materials for permanent magnet speakers being responsible.

If you want your set to be original you will have to source a speaker from a scrap set. Otherwise you can use a PM loudspeaker and fit a smoothing choke in place of the field coil.

Re: Field Coil Speaker
 

Bizarrely yes! I was shown a huge pair of new 'Focal' speakers the other day that despite being intended for domestic use almost reached the ceiling of the room that they were in, with the other dimensions almost to scale. A 'special feature' was than the woofers were electrically magnetised, which made me laugh. Goodness knows what the reason was, something else to fiddle with?

Needless to say this was being offered as the latest thing, not something from the 1930s which had become unnecessary decades ago. They cost £silly as well, so I won't be buying a pair.

Re: Field Coil Speaker
 

I was thinking of a 5" field coil speaker & the chassis that needs it has little room for a choke, unless it was very small. It depends on how many Henries value the OE field coil was & the HT current drawn through it. Probably why a field-coil speaker was used, even in a 1939-40 radio.

I shouldn't have thrown out the defective speaker obviously. Someone on this Forum might have been able to help getting it re-coned. You know how 'crispy' very old paper gets.