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Most of the time, radio schematics are oriented to the major audience, such as France, USA, Great Britain. Very few followers of India manufactured sets. Our greatest resource is Publishers that were active in the USA, Bietmans, SAMs photo fact, Riders, and since the USA had the biggest share of radio manufacturers the efforts were to concentrate on those that had control of major currencies.
Unfortunately India has a poor History of Inovation in the realm of Radio. And most patents were held by major players like RCA, HAZELTINE, G.E. and others in the 1920s, through 1950s. Then Japan saw the maker to compete successfully. Because India never became an Industrial Giant at that time they couldn't compete. However, we are starting to see India become a Major manufacturer, and is now successfully invading the World Market. I am sure it's because of cheaper labor costs there.
We also as a country are making computer resources a for
historical record of just about everything and that includes antique radios, but you are correct in not getting any responses. Sorry to say! Are there any clubs in India that specialize in radio schematics? A hint might be to find amateur radio clubs and antique dealers that know of radio engineer's
and technicians through electronics manufacturers, and even try Facebook, Twitter, and such.
I am sorry, but I wish you the best, however, you could post and submit to the likes of BAMA ON THE Web.
Here's one listed with radio mfg. address in India. http://www.radiomuseum.org/r/ekcoindia_u764.html
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I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!