Thanks.
I believe this preamp was used to drive Philips motional feedback speakers. I'm not sure what this involved and whether they were driven direct, but if you have a look in the first post above you can see the third output which is +10dB which I think was for these speakers.
Other than that, I know nothing!
Stu
Just discovered that the website I linked to (MFBfreaks.com) is not exclusively written in Dutch, some parts have been translated into English, German and French.
The theory on MFB is also available in English and German.
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