I never had a 5A diode, but I found on Musikding web site this one: SB560.
About the ground loops, you mean that I could have problem if I use the TPA3118 amp, power up with an Amazon 19-24v, with my pedalboard? Now I have just a 1-Spot as PSU, and my pedals are in daisy chain.
P.S. about the...