I have a few dozen tapes to convert for a medical professional (treatment documentation -- with waivers signed where used in a public context). I'd also like t

I have a few dozen tapes to convert for a medical professional (treatment documentation -- with waivers signed where used in a public context). I'd also like to convert a few personal tapes, e.g. of my great aunts discussing times out on the old farmstead. Unfortunately, the tapes have some age/wear issues. And the fancy-schmancy Sony DVD/VHS combo recorder/player I was given promptly turns these -- which play well enough directly to the TV -- into extreme pixelation. So, any equipment/procedure recommendations would be greatly appreciated.