Hi Guys,
I think it incredibly unlikely, but since I haven't joined any clubs yet,
I don't know where else to ask.

I'm after one of these... I know the Airzone radio is 1935.

Image Link

Image Link

Cheers, Brek.

You'll need to post a picture of the radio. With that we can give you make, model, date of manufacture, etc.

I know all the detail of the radio though. I'm only after the original speaker.

Airzone 602 chassis 1935 if your articles about the licence tag are correct.

Radio is all working with a replacement speaker, but I'd like to chase the original.

The last console Airzone I messed with was a 1938 612 Battery job.In 2010.

If you want to see what at least one real Airzone speaker looked like, It had one. Because it was what it was. I went to the trouble of repairing the the broken wire in it.

It is in Silicon Chip showing the speaker.

I think the one in the picture is the original one, it was wired pretty well to the plug,
and there is at least one Google reference that the model
162D or 162 was manufactured in 1934 (one year prior to the radio).

But this one pictured has open field coil and open piggy back audio transformer.

Also, in pulling it apart to measure impedance, and look for a break in it's coil I'm not sure I could get it back together.

If the coil is open you are in the poo anyway & that one looks like the two screws lift the saddle holding the coil.

At that age It may have dowels, but there will be stains where the saddle sat & spray paint (before) has been invented, to make sure.

You may be lucky and its a corrosive break on the outside. Dissimilar metal joints should be coated.

At least its not like one that I got where the coil had been removed with a Cold chisel & replaced using a "stick welder".

Crackpot... The coil was good but the welder stuffed the rest of it.

I'm surprised their 30s speaker looks the same as their post-war 12" field-coil magnet used in some AM-FM-Phono units, used same pressed steel logo O/P transformer cover featuring lion roaring from horn speaker.

At least its not like one that I got where the coil had been removed with a Cold chisel & replaced using a "stick welder".

Just when one has thought they have heard everything...

That yarn has made my whole week. What people won't do to look foolish...

I think I wrote this one up as it was so incredible, it may be on the backups? It was a litany of disasters & was the first one that I had that was squegging.

The mains cord (not the only one I have seen similar) cloth sleeved rubber was a series of 3/16 beads from start to finish, this of course was no impediment to turning in on to see if it went (blind optimism).

It looks unlikely that I'll find one, and if I did,
I'd perhaps be afraid to use the radio with it considering it would be a costly speaker!

One possible way would be to look on eBay, and buy a whole radio with the right speaker,
and replace it's speaker with a permanent magnet speaker, and then simply resell the radio.

But then any radio out there with a good speaker from 1935
is likely going to be a radio you don't want to pull the speaker out of.

There is also the issue that the field coil doubles as a filtering inductor on many (maybe even most) radios fitting with electro-dynamic speakers.

It is a moot point that you just can't grab any old speaker. The field coil has a DC resistance eg 1000R, 1500R or 2500R being the most common. Yours being 2000R is not one I have seen.

That resistance has to be replaced. If the bobbin is removable, you may be able to get someone, or a motor re-winder to rewind it. but it must be wound in such a manner that it produces a north & south pole with DC.

Otherwise its resistors & a permanent Magnet speaker.

That is the current solution.
I have a bank of cement resistors, the sum of which is 2030 Ohms.

Interestingly, the radio also has a power choke in it's supply,
in series with the field coil, with a capacitor to ground where they connect.
The value of the choke isn't given away in the schematic.