Here’s the update

. I replaced IC2 socket, replaced c4, c6, c7 with Panasonic caps and evening put in a new ne571, same issue, wasn’t working. Replaced C27 thinking it’s linked to IC2 might help, didn’t solve the problem. I put back in original v571.
Was about to throw in the towel. But Scruffies comment on Tayda caps kept ringing in my mind, so on a whim decided to replace C54 and C63, the two 100uf caps, with Panasonic caps. No logic behind it. And circuit started to work as expected and it’s been running now for 3 hours the voltage on pin 7 has remained stable at 7V and getting a modulated output.
Will keep it going for a few more hours and see if any issues come up. It’s only been running in the flanger mode.
Was trying to read up to see how the caps for the voltage regulator could have an effect on the NE571, would be interesting to know.
So should I throw out all my tayda electro caps


? Never had an issue for my other builds until this one....