[UK-CONTEST] Safe working with HT

[Ken Eastty]

> Be very careful, unplug it at the mains and wait till
> the Hi voltage has dropped to zero on the meter and even then beware as
> the screen supply might still be dangerous.  If you don't find anything
> obvious I wouldn't take it any further than this unless you are
> comfortable working on equipment with high voltages - there's an awful
> lot of exposed Hi voltage and mains connections inside this amp.
>
> 73 John G3UUT
>

I agree with that but as well as unplugging HT supplies from the mains I 
always use a big  screwdriver (with an insulated handle) to short HT 
leads directly to ground even after allowing time for the C's to 
discharge. If you make a habit of doing this as well as disconnecting 
from the mains it reduces the chances of having an accident but if you 
do get it wrong you'll get one hell of a bang! Also avoid working on HT 
when your tired or distracted.
The big HF transmitters that I worked on many years ago were all fitted 
with an "Earthing Stick" which we hung on the anode connections before 
venturing any further inside the TX, there was no second chance with 
10kV supplies!

Be safe,

73...

Ken

G3LVP