Extreme grain in prints

I'm a novice and just started out. I use Kodak Tri X, develop in D76 and print on Ilford RC paper using a very old (and untested) B22 enlarger. The prints though are extremely grainy on 5x7 paper and not suitable to keep or show even to family. I do not have these probelms with the color shots processed and printed at the local Walgreens. Both photography shops in my area have closed fairly recently, any advice on how to troubleshoot this?

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