Hey, I have a hard time to guess what prices I should put when I'm selling used gear.

For example, if I had a guitar that costs 300€(new) and I've had it for a year and it has no dents. What should I put as price?

Same with amps!

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You have to wait about 10 or 20 years for most gear to start going up in value... there are exceptions obviously, but generally this rule holds.

Anyway, you need to see what a reasonable new price for the item is. If you could reasonably expect to find something for $500, and it's a year old with no dents, I would be asking $350-$400.
Marshall amplifiers are the truest purveyors of rock and roll known to man.

"And give a man an amplifier and a synthesizer, and he doesn't become whoever, you know. He doesn't become us."

Holy crap, check this out!