I have just purchased a Type C Nathanial Baldwin Horn. When I opened it up I found a small speaker where the driver should be. I went on the net and found a couple of places that sell vintage Baldwin Type C headphones. The ear piece drivers look like they will screw right into the Baldwin horn. Can anyone verify that?

If it will work, do I need to purcase a single earphone or double earphone headset or does it matter - they all seem to have different readings from about 1.4K to 3K.

Could work if it fits and the coil is good.

But, the performance likely will not be as good as the little speaker (along with a small audio matching xfmr, I presume). Many of those old drivers' permanent magnets have lost some (or much) of their magnetism.

Since the replacement speaker doesn't show, I would leave it alone.

:Could work if it fits and the coil is good.
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:But, the performance likely will not be as good as the little speaker (along with a small audio matching xfmr, I presume). Many of those old drivers' permanent magnets have lost some (or much) of their magnetism.
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:Since the replacement speaker doesn't show, I would leave it alone.
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Thanks Doug but the speaker is from about 1916 and I want to hook it up to an Atwater Kent - so I really do need a driver.

There must me a misunderstanding between us.

A little PM speaker, combined with a suitable matching xfmr IS a driver and should be fine with your AK radio. It does have an audio transformer added, right? And both the speaker and the xfmr are concealed in the base of the horn where the original driver was?

That is the most common way for fixing horn speakers whose original driver is shot. I have several horn speakers that I use with 1920s radios - only one has an old-fashioned driver, the rest have been repaired with modern PM speakers and an audio matching xfmr.

:Thanks Doug but the speaker is from about 1916 and I want to hook it up to an Atwater Kent - so I really do need a driver.
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Hi Doug. No there is no XFMR and to be honest I would not know what to use and that is why I thought I would need an original driver. What would the specs be for a suitable transformer?

Pick a small PM speaker that will fit - know its impedance. These speakers are available on internet electronic sites.

You'll want maybe 1-2 Kohms on the radio's final audio stage. So, pick a small audio xfmr with winding radio such that the square of the winding ratio, R^2, is given by:

1000 (or 2000) ohms = XR^2, where X = the PM speaker impedance, for example 8 ohms or whatever. The small speaker, maybe 2" and audio xfmrs, for transistor radios, are readily available.

Or just use your existing speaker, and maybe slap in a tiny audio xfmr, perhaps 1:9 winding ratio, or so - it's not critical.

You can certainly look for an old-style driver. Don't buy one that isn't tested. By this time, many are shot or weak magneticly.

Thank-you Doug.