Sga STV - schematics?

I recall once seeing someone here mention something about them having looked at the STV schems, which presumably means they are available. However, I can't find them at any of the usual sites - can anyone point me in the right direction please?


Thanks

I'd also like a copy of these so I can work out why the stereo sound output is only about 5% of the volume it should be, and hopefully also work out a fix for the problem.