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Old 24th Oct 2021, 4:16 pm   #11
Mr 1936
Heptode
 
Join Date: Mar 2017
Location: Romsey, Hampshire, UK.
Posts: 511
Default Re: Celestion PPM Soundex Speaker Impedances

"if you know (or measure) the expected quiescent current of the o/p valve and subtract an average current for field coil you can work back to the DC load presented by the transformer primary, given its drop from supply voltage"

You've lost me there, Sandy

I read that advert for the energised speaker and took the values to be the DC resistance options for the (magnetising) field winding, i.e. not the AC impedance presented by the voice coil/tapped transformer combination.
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