After a year anything can happen. Did you buy with a warranty? If not, you should have paid more and bought new. Reason for selling? Going from SS to an all tube system.
Reason for selling is...
I'm always amused that sellers bother to give reasons why they're selling their gear. Obviously in the vast majority of cases, they don't like it in their system. But only a very tiny minority will say that. People are (1) moving; (2) downsizing; (3) upgrading; (4) getting a divorce; (5) undergoing surgery.
Look, just assume buyers aren't stupid. We know why you're getting rid of stuff. If you haven't lied about the condition of your gear, do us the courtesy of letting us decide independently of your reasons for selling, which all seem to be designed to reassure us that your stuff isn't bad.
Look, just assume buyers aren't stupid. We know why you're getting rid of stuff. If you haven't lied about the condition of your gear, do us the courtesy of letting us decide independently of your reasons for selling, which all seem to be designed to reassure us that your stuff isn't bad.