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Is the anything to loose from using an very small isolated power supply like this one: Gator GTR-PWR-5 https://www.sweetwater.com/store/detail/GTRPWR5–gator-gtr-pwr-5-pedal-board-power-supply

This power supply will not work because it does not provide enough current, even if you combine all the outputs. At 9V the H90 requires 800 mA. At 12V it requires 600 mA. We recommend something like this: https://store.eventideaudio.com/collections/accessories/products/powermini

One outlet will be sufficient for the H90 running it at 12V.

Also – what is the exact connector size for the DC 9-12 input ? I noticed that some do not fit

The barrel cable needs to have a 2.5 mm connector and it needs to have a center-positive polarity.