Channel Tuner Module needed for 1985 Sylvania

I posted this message before but got no response. Perhaps the title was not specific enough. My question more simply put is heather or not television tuner modules are interchangeable between sets made the same year by different manufactures and where I can get one.
Thanks again,
Jimmy2

Does any one know where I can get a replacement tuner module for a 1985 Sylvania 25 inch "Digital Remote Tuning" model color television. I heard that the electronics are the same for a few other television manufacturers sets made that year like Phillips.
Other considerations are whether it is worth it to replace the tuner if it costs over $50.00 or just buy a new television. I am not the greatest solderer either....
Any suggestions would be appreciated.
Thanks,
Jimmy2