[mythtv-users] Hum on analog audio to TV

[Brian Wood]

David Brodbeck wrote:
> Scott Alfter wrote:
>> (If you have one (I have a couple), put a polarized plug on it and make sure
>> the chassis side is connected to neutral (a continuity tester between the
>> chassis and the wide blade should light up/buzz/whatever).  This should
>> somewhat mitigate the shock hazard that the AA5 circuit can pose.)
> 
> This works *if* the power switch is wired to the side of the cord that
> isn't connected to the chassis.  If it's not, the chassis will still be
> hot when the switch is off, unless you rewire the power switch.
> 
> Unfortunately, the switch being on the chassis side is pretty common.
> It saved them a few cents per radio in wire and also slightly reduced
> the amount of hum coupled to the volume control by the power switch.

Then there are the folks who defeat the polarized plug. I once saw a
mobile home that burned to the ground due to somebody deciding this was
a good idea.

"Hot Chassis" sets are dangerous, but they saved money, power
transformers are expensive.

beww