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AV modulator schematic needed

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neazoi

neazoi

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Hello,
I am looking for schematics for TV Audio and video modulators for my collection.

I am basically interested in simple schematics using only transistors.
I have searched the web and found 5-6 of such circuits but I think a greater source will be these vintage transistor based AV modulators from video players.
They reside in every older video player close to the standard TV tuners units.

Have you got any of these schematics to post or do you know another online source for them?
 

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