[NJARC] Philco speaker

[Al Klase]

Hi Joe,

All I heard was crickets, so I'll weigh in on this.

I think you want something like this: 
http://www.ebay.com/itm/vintage-PHILCO-TUBE-RADIO-part-Working-FIELD-COIL-SPEAKER-9-type-E-/331696700301?hash=item4d3aa9fb8d:g:mgcAAOSwo0JWNYxu

If you look at the Model 87 schematic, it says the speaker field coil is 
3200 ohms:




This is the important parameter.  3500 ohms is close enough for 
government work.  The earlier speakers had higher resistance coils. If 
you use something from a newer radio with, say 500 ohms, you might have 
to re-engineer the power supply circuit to get everything working 
correctly.  The 9" speaker should physically fit OK, I don't know about 
an 11" unit.

I was a little confused about the guy's 320-ohm voice coil, but I'll bet 
he was reading the output transformer primary, rather than the secondary 
/ voice coil, which should be 10-ohm'ish.

Hope that helps,
Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 9/8/2016 4:48 PM, Joseph S Bentrovato wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
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> _________________________________________________________
>
>
> My Philco 87 console 1929 lowboy has a speaker with an open field coil 
> - therefore I need a replacement.  On e-bay there appears to be two 
> speakers with similar physical appearance.  One is described as Type 
> E, 9”, field coil 3.5K ohms, voice coil 320 ohms.  The other is Type 
> G, 11”, field coil 520 ohms.  Unfortunately I don’t know how to tell 
> the difference.  When I measured my bad speaker, I measured 10” 
> (approx.) diameter.  Would appreciate if someone can straighten me 
> out.  Thanks.
> Joe Bentrovato
>
>
>
> Sent from Windows Mail
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