If the problem was too high of a pH, you would see interveinal yellowing beginning with the youngest foliage first due to decreased availability of micronutrients.

Yellowing of older leaves could be a ton of different things like low nitrogen, over watering, under watering, root disease, etc.

There are potting soils for African Violets, Rhododendrons and Azaleas, Camelias, Orchids, and many other special needs plants. One of those will be fine for Raspberries and other plantws needed special soils. Just determine what the needs of your plant are and find one to match.

Peat moss is acidic. You could also add a little sulfur to the mix. No need to buy "special" mixes.

I agree with gargwarb about the most likely suspects. The potting soil you are using can contribute to watering issues, too.

I grow raspberries with a pH in the low 7s (in soil, not a pot). I, too, suspect the suspect is on gargwarb's list.

tj

Thanks for the tips. I think I might be over watering. I've got to get a handle on that. I do my best with sticking my finger in the soil the first few inches and if it feels dry then I water. Maybe the "way" I water is no good? I put them in shallow pots to catch the water flow from the bottom and then totally soak the plant for about 20 minutes then I lift them out to drain. They drain well, I also have screen to cover the drain holes so no soil runs out.
Halime