I've recently bought an used Orange Tiny Terror Combo which, as far as I know, had been really well taken care of by the former owner. I've been taken care of it as if it was a lady! I always turn it on at the stand-by position with volume and gain set to 0 and wait at least 5 minutes before selecting it to 7 or 15w and beating the hell out of it! Although I don't believe that's the case, I've already tried another guitar, another cable, another anything but the amp. The thing is: I'm taking it to somebody who understands and works with amps tomorrow but, considering I'm a newbie, I decided asking you guys first so I have at least the minimum input before the guy tries to "steal" me! Is it possible that I got a broken valve? What other issues may I have? I really do aprecciate any help and I am already very thankfull! PS.: That's the first thread I start. I'm familiar with forums and read the rules section and hope/believe I'm not breaking any rules nor posting at the wrong section. I so, I apologize!