Not long ago I purchased a 1 watt Marshall head (it has on/off - no standby). As usual even though no standby, I give the tubes a while to warm up before plugging in. For the very first time using the amp, I returned in 5 - 10 minutes after warm up, and plugged in the guitar, but there was no sound. Well never before this incident ever what I failed to do was insert the speaker cable fully into the amp's output. It has the normal, slight 60Hz hum but a low volume static sound sometimes, not always which is heard before playing and sometimes during low volume. I did also notice a crackling/static sound when playing low open E and A, but I think it may be my guitar cable. (shut amp off came back an hour later and it did not occur after unplugging and plugging back in) It seems what I failed to do was akin to not connecting an amp to a load before turning it on. What does it do to the amp other than from what I read possibly fry the tranny ? Sound like this little amp is messed up now ?