Since I joined this forum I've been looking for specific information about the real risks and possibilities of damage when connecting a tube amplifier (in my case a DSL20HR) into an ungrounded outlet. Let me explain: In the country where I live, although there are national regulations and everything else, it is not very common to find sockets with proper grounding so many here always use their tube amplifiers without grounding while others not always, or only when available. Obviously this is perfectly possible, and I myself have grounded outlets in my house. The problem is when we need to take the amplifier to a rehearsal place or even a gig, the chance of being lucky enough to find a grounded outlet is almost zero. In addition to grounding problems, here we also have nearby cities with different voltages (127 and 220 volts) which makes everything more complicated if we are not careful. Therefore, I would like to know about the real risks of using a tube amplifier in this condition, if there is, in addition to the obvious risks such as electrical discharges, any real risk of severe damage to the equipment under normal usage conditions, and if there is anything that could be done to minimize these risks in situations where grounding is not available. Thank you guys in advance for any tips or opinions.