0812 means August 2012 so if it has original tubes, it's time to retube. Start with the output tubes first - you don't really need to replace preamp tubes as often. Thanks for your reply bclaire! Can they go bad but still look good? I looked at the power tubes and they dont look bad, but didnt chec...

Hi, im new here. I have an orange OR 15 I bought a month or so ago. Its starting to sound a little thin with the gain turned up so im wondering if maybe it needs new tubes. I bought it used and i think the stock tubes are still in there (JJ EL-84). Are there any known problems with the or15s that mi...