Eureka! Thanks Ken.
It seems like the LM3080 chips which I purchased from Small Bear Electronics in the US work just fine but the CA3080 chips which I purchased on Ebay from China don’t work. That’s confirmed as I tried them in the working version of the CGS49 and they exhibited the same malfunction.
Thanks so much for your help. I’m going to put an order in with Small Bear right now and get the proper chips and in the future avoid buying anything from China.
I’ve learned my lesson.
Thanks again so much for your help Ken and for making such awesome modules!
Rich