[GreenKeys] Re: Dovetrons

[Bob Camp]

Hi

This is actually a good thing to check for on almost any gear before 
hooking it up to a computer.

Almost all of the old stuff (TU's, Teletypes, Punches, Radios, and 
Guitar Amps) have a 0.01 uf (or larger) cap from each side of the AC 
line to the chassis. It was a common way to try to reduce RFI. It has 
never been clear to me that it worked very well at all. If the chassis 
of the gizmo is not grounded then you get half the line voltage on the 
chassis. It will give you a noticeable "bite" if you get between one 
and ground. I have never heard of it causing personal injury.

Unless there is something very weird about the Dovetrons the current 
and voltage are *way* below the modern ESD limits. I suspect you might 
be able to get a replacement motherboard if it's still in warranty.

If you do decide to throw the Dovetron out the window *please* let me 
know which window and when. Alternately I'll gladly pay shipping ....

	Take Care!

		Bob Camp
		KB8TQ




On Feb 12, 2005, at 5:24 PM, Doug Alderdice wrote:

> I measure 60 VAC between the frame of the Dovetron to either the 
> shield or audio out line of my computer's sound card.  Tried reversing 
> the line cord to the Dovetron and same result.
>
> Be warned.
>
> Doug.
>
>
>
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