I've been doing a bit of research , cross referencing between different builds and I see that some use Tantalum Caps and Polystyrene (EZ1290) and the proaudiogc doesn't. I've seen the same happening between the EZ1073 500 and the DIYRE version .
I'm still a beginner in many ways so I'm trying to make sense of what's the most "authentic" to the original design. Are those designer choices or a variation on the circuit?