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WINTEC of America, Inc. Audio equipment manuals- User Guides and Service Guides

WINTEC of America, Inc. was based in Long Beach, California. They made audio products back in the late 1970's. Receivers with a silver face, cassette decks, speakers, and maybe more. But Luxman supposedly built the stereo receivers for the brand. Visual observation can support the similarities and build quality. Personally Luxman is a brand I have no first hand knowledge or experience with. I do have knowledge and experience with a Wintec R-1120 stereo receiver because it's sitting on my shelf. Let me say it makes my Sansui QRX-9001 look small.

I'd like to know more about this brand.
Plus I'd like to request any manuals if they exist.