Croft specs - too much gain?

[Wegamus]

OK. Power the 7R without anything connected to the inputs.

You may get a sort of hum from the input not being connected to a low impedance source, but listen and see if there is hiss.

I got the hum like you said, but hiss was much less than before and was a bit hard to hear through the hum. There was minimal hiss.

It’s worth noting that the guy who sold me this amp told me it didn’t hiss at all when directly connected to his DAC with the DAC as volume control. The 25R he had didn’t have any hiss with another power amp he tried either. But when used together the 25R/7R had hiss, just like I’m finding. So individually the Crofts were fine, together they hiss.