Before my intervention, one of the drivers was dead and the tweeter was filtered by a nasty electrolytic capacitor and its level was far too high, resulting in very harsh sound.
I first replaced the main driver that I found at WES in Ashfield and I calculated a better crossover for the tweeter.
a simple resistor network and better capacitors. The result is quite satisfactory.
And here is the result...much better
They are now used by my son with a very old MOSFET amplifier and a Bluetooth receiver fed by his iTunes....
During the last stages of our conversations, and after finally finding the real configuration for the Integrales crossover, Perry G shouted a last letter to PE Leon in the hope, I guess, to see our efforts vindicated. And this time, he got a response from a newly appointed export manager, promising to send the proper schematics, as soon as PE Leon came back from a trip. Although at first, Perry though that might well be another dilatory measure, he was quite surprised to receive that information a couple of weeks after, without to have to ask for it again... So, Perry was quite chuffed, and I was quite happy that this beautiful vintage document - nobody was using CAD then - which, after a bit of deciphering, proved to be exactly what I revealed in Episode 6.
So, it is a great story with a happy ending and I hope that Perry will now enjoy his renovated speakers for years to come. I have been told that he might even put his beloved Audio Research amp in service, after having replaced all the valves and put the whole thing through a serious burn-in session!
Hopefully, we will hear from him about the renewed pleasures of listening music on a fabulous set of vintage HiFi!
I hope you have enjoyed our journey and the story and would welcome any other enquiries into helping other vintage enthusiasts willing to restore or upgrade a beloved pair of speakers.
Born in France, well travelled, relocated to Sydney in 1997.