Blatthaler Speaker?

[phase_accurate]

Not a big deal... think low voltage output, high current, like welding... big step down. The VC on the one that "meanders" was likely a fraction of an ohm, like a real ribbon... it looks like it merely snaked its way through the gaps in a _-_-_ <--- zigzag.

Zig-zag isn't a bad description indeed.

The output tranny must still have been impressive. They were talking about 1 kW !!!!!

Regards

Charles

[david yost]

Hiraga's book goes into some detail concerning the Blatthaller. My French is very poor, but I gather that this thing was the precursor and much stouter father of the Orthophase speaker family and was used for PA. It seems to have had field coils and some versions were push-pull...and weighed over 400kg. I am sure fr was very limited, but total radiated power in its bandwidth would have been very impressive. Google Altec's Giant Voice for a stateside compression driver solution.

[bear]

Think about a scaled up ribbon speaker transformer - the secondary would have to look like not very many turns of very thick fat flat wire, maybe a numer of layers interleaved...

If I had to build one with tubes, I'd have set up some large high current transmitting tubes as followers in the output section to keep the turns ratio down to a reasonable amount for winding, and give up some modulation if necessary, depending on if I could get enough swing on the drive side... one could bridge two for extra oomph!

Anyone want to order one?
I can build.

_-_-bear

[OzMikeH]

I am in the process of replacing a PA system that was 24V powered. the output transformers are about 0.3 ohm on the primaries. Each amplifier is 250W 100V line. The transformers are driven by about a dozen transistors in parallel.
these are designed for a big alarm system, rated for continuous output for many hours.
The transformers aren't that big, a roughly cube shaped item that fits easily in a 3RU rack case.
Primary windings are a thick enamelled copper wire that is slightly squared off to allow for close windings.

You could make a rather hefty transformer using dual primaries (driven by 2 amplifiers) and an output winding of copper or alumium tape.
I have seen some copper tape for small welders that is approx 1mm thick and 5mm wide.

[tomtt]

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