[quote name='Dave' post='302031' date='Oct 8 2008, 11:38 AM']Cheers for that OBBM, great advice. Valve "black-arts"... I like it! If only I knew what the HT was, I'd be sure to switch it off. I assume it's the "stand-by" switch?[/quote]
Sorry. Tech talk. HT is the High Tension supply to the valves. This can vary from 350-volts DC up to 700-volts. This is the lethal voltage that is talked about and is controlled by the Standby switch. However when you switch it off the voltage takes quite a long time to decay so that is why you have to be extra careful. Just switching off does not mean that it is safe to have a poke under the chassis.