10" Telefunken field coil speaker from 1938 with matching SIEMENS Klangfilm PSU

10" Telefunken field coil speaker from 1938 with matching SIEMENS Klangfilm PSU

Hello guys!

Today i connected 2 x 10 " = 25 cm full range speakers from 1938 , made by Telefunken and SIEMENS , also found as " Klangfilm " speaker.

These pair is in good working condition.

I connected the two speaker with the vintage SIEMENS Power supply and tried lowest DC control first ( around 40 Volt ) .

This was the smoothest result at 40-50 mA for both drivers.

After that, i pushed up the DC voltage to 80 Volt , you can hear in the video that the result is higher volume .
In step three i put the switch to "3" that means around 130 Volt DC.
There no acoustic advantage.

So i decided to use 40 Volt with " perfect result ", both drivers are running with 50 mA , see my test with ampere meter in the last minutes of the video.

Enjoy the historic pair Telefunken speakers with some Jazz music !

thanks for looking !!