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 Post subject: philco 91 electrodynamic to pm conversoin
PostPosted: Mar Tue 06, 2018 2:34 am 
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Joined: Apr Thu 26, 2012 2:18 am
Posts: 297
Location: Tulsa, ok 74104
ok I have searched and have not found a speaker to replace my k-6 philco speaker for my philco 91 . At this point what I would like to due is replace with a pm speaker so I need a choke. dose any one have any idea what would be a good one to use
benny


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 Post subject: Re: philco 91 electrodynamic to pm conversoin
PostPosted: Mar Tue 06, 2018 3:37 am 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 4521
Location: Near Brandon, Iowa
You don't necessarily need to use a choke. You can use a power resistor that approximates the resistance of the field coil that you are eliminating, and boost the "downstream" filter capacitor value to compensate for the missing filter reactance.


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 Post subject: Re: philco 91 electrodynamic to pm conversoin
PostPosted: Mar Tue 06, 2018 3:55 am 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 23352
Location: Annapolis, MD
what is wrong with the original speaker?

_________________
-Mark http://pixellany.com

"It's always something". --Gilda Radner (1946 - 1989)


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 Post subject: Re: philco 91 electrodynamic to pm conversoin
PostPosted: Mar Tue 06, 2018 6:13 am 
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Joined: Apr Thu 26, 2012 2:18 am
Posts: 297
Location: Tulsa, ok 74104
don't have one


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 Post subject: Re: philco 91 electrodynamic to pm conversoin
PostPosted: Mar Fri 09, 2018 4:04 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 19034
Location: Warner Robins, GA
You don't necessarily need the original speaker.

Provided the output transformer is on the radio chassis all you need is an electrodynamic speaker of the same physical diameter, the same or close to the same field coil resistance and the same or close to theh same voice coil impedance.


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