Puritan vs niagara 1200


Puritan psm 136 vs Niagara 1200.

Wich one would be the better choice to clean dirty electric?

A friend of mine is thinking to buy one of them for his Hegel H390.

I myself do use this Puritan power optimizer psm 136 with my Hegel H590 (2x300watt) and an old Sony cdp-xa50es cd player. I do like this Puritan very much.
thei
Does anyone know how the surge protection actually works on the Puritan?  Does it blow an internal fuse or?
The Ear review in 2017 was of a much earlier model which  had an input fuse and separate fuses (6)  on each output. The filtering on this model was also steeper  per stage resulting in the 8Amps power route to each socket. Current model has no fuses, these being  replaced by a single thermomagnetic breaker with solid silver contacts. The filtering was reduced and current path to each output increased from 8 to 15 Amps