No argument there, Steve.  I suspect that John Miller is correct about the 
grounding loop.

Steve

----- Original Message ----- 
From: "Steve Forst" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, February 28, 2011 13:00
Subject: Re: RFI Saga continued


> Steve,
>
> Yeah, I know, but Tom seemed a bit concerned about sticking his mitts in
> there.   I think we are all trying to tell him in various ways that  as
> long as he is unplugged, nothing bad will happen to him, either from the
> a.c. or d.c. sides.
>
> I still have a feeling that on the inside  this screw may be  the
> connection to chassis ground for the a.c. line cord, and he would be
> better off getting it tight.
>
> 73, Steve KW3A
>
> On 2/28/2011 12:32 PM, Steve Dresser wrote:
>> Steve,
>>
>> Even if there were high voltage on the DC side of the supply, you 
>> wouldn't
>> get a shock from the AC socket because the DC voltage will never be 
>> passed
>> back through the power transformer.
>>
>> Steve
>>
>> ----- Original Message -----
>> From: "Steve Forst"<[log in to unmask]>
>> To:<[log in to unmask]>
>> Sent: Monday, February 28, 2011 09:19
>> Subject: Re: RFI Saga continued
>>
>>
>>> Tom,
>>>
>>> This isn't your amp, where  a few thousand volts are floating around.
>>> While you should always be careful messing around with this stuff, look
>>> at  it this way:  If you turn off the supply and unplug it from the
>>> wall, and your hand brushes against the a.c. plug, will you get fried?
>>> If you are super paranoid,  unplug it and measure the voltage at the
>>> plug, which will be zero, and proceed.
>>>
>>> I do think you should tighten this thing up.  I'm not sure it is even
>>> the "official" ground lug.   On the inside it is holding a small thingee
>>>   with wires connected to it.    I'm not positive, but it may well be
>>> where the
>>> third wire of the a.c. line connects to chassis  ground.
>>>
>>> If it were me, I'd tighten it up and ground to one of the cover screws.
>>>     And since you  don't know you're own strength, just tighten good and
>>> snug, you're not torquing down head bolts on a Mack truck.
>>>
>>> 73, Steve KW3A
>>>
>>
>