model 20 speaker - Printable Version

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model 20 speaker - Micro9 - 10-16-2019

Will a speaker from an philco 89 work in  model 20?

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RE: model 20 speaker - morzh - 10-16-2019

Well.....the Field coil in 20 is 3100 Ohm and in 89 is 1100 Ohm.
You will need to add a resistor in series if putting the 89 speaker in 20.

And this does not account for the transformer. It has to be replaced by a P-P as it is a SE.


Also, the 89 speaker is 1.2 Ohm VC and I do not remember exactly but I think the 20 is 0.7 Ohms VC so the Philco transformer will not match the impedance properly even if it will work not optimally, so you might need a new transformer, like a Hammond with adjustable In/Out ratio.

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