ATMA SPHERE SCHEMATIC for a UV-1 M/M.......

As the current service department for Nagra, and former service tech for dCS, Musical Fidelity, NAD, Arcam McIntosh Labs and several others, I guarantee that none of those companies ever allowed schematics to be distributed to customers or non-authorized service companies.
Most manufacturers require signing a non-disclosure before sending the tech their manuals.
I totally agree with this philosophy; keeps all the hard earned R&D costs in house.

Trelja, This is a problem with some in the  High End audio sector. 
I own a Response Audio Bella Extreme 100 watt mono block amplifier and needed the schematic for a technician to do service.  Multiple requests were made to company owner Bill Baker who promised to send a copy but never followed through with it. Very frustrating. 
Charles 

This may fall into the area of intellectual property.

+1 mcintech

try talking about how the intellectual property of many designers is stolen from them and sold as cheap knock-offs from small Chinese companies, on eBay. Where some people buy these ’copies’ to the tune of hundreds of examples.

Where the circuit itself is the LEAST of the aspects that makes the gear perform as well as it does.

Nevertheless, hundreds of the bad copies are sold....to people who do not understand these aspects. Thinking they are getting something for nothing. A quick search on ebay will show many dozens of re-sellers of cheap copies.

For some enlightenment on this subject, do a search and you will find much discussion on this at the audio site ’DIYAudio.com’. Some of the designers will share their experiences. Quite the horror stories.

Essentially, is it any wonder at all that some don’t share their schematics, these days?