I would guess that "max volume no music playing" would result in hiss or noise of some other character, with any phono stage ever made, tube or SS. Solid state units are most prone to produce some hiss (rather than hum, rush, or buzz) under those circumstances. Fortunately, the condition "max volume no music playing" is for all practical purposes irrelevant. I don't know about the Chinook, but I own a Steelhead, and it is very very quiet by any standard. So far as I can tell, the Chinook phono circuit is very similar to the Steelhead's. Also based on my knowledge of the Steelhead, the Chinook phono section may be more accurately thought of as a hybrid of transistor and tube.