[Boatanchors] AC line plug polarity

[Singley, Rodger]

Barrie,

Paul has it right.  You should move the fuse to the switched side and that should be the "hot" or black side.  Neutral should never be fused or switched (although it often is in vintage gear).  I wire the line bypass cap in the hot side after the fuse.  Definitely replace the old line caps with new ones.

Rodger WQ9E


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net on behalf of Paul Kraemer
Sent: Mon 1/4/2010 4:23 PM
To: Barrie Smith; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] AC line plug polarity
 
Barrie
A man after my own heart!
The fuse and switch should be in the same line---this will be the "Hot" or 
black lead. Fuse is the first item the cord connects to!
The other lead will be "Neutral" white lead
The Ground green lead goes to chassis
Now, get rid of that old cap to ground. It has served well.
Replace it with two approved line suppression capacitors. Use a X type 
across the line (after the fuse) and a Y type from neutral to ground. There 
are also some rated for either service X or Y. A typical value for these 
would be 0.005 mfd, maybe as high as 0.01mfd.
justradios.com has a lot of good information on line safety capacitors.
Paul K0UYA
----- Original Message ----- 
From: "Barrie Smith" <barrie at centric.net>
To: <boatanchors at mailman.qth.net>
Sent: Monday, January 04, 2010 4:17 PM
Subject: [Boatanchors] AC line plug polarity


> Hello:
>
> I'm working on an old tube-type amplifier, in hopes of using it as a 
> speech-amplifier.
>
> The unit doesn't have a line cord.  It has a terminal strip that takes 
> care of all the ins-and-outs.
>
> It was built in the 1940s, so the AC in is just two terminals.  I'm 
> thinking of placing a three wire cord on it so that the chassis is 
> grounded.
>
> Fortunately, I have a schematic which shows one side of the AC switched, 
> and the other side fused.  Neither side of the AC is grounded, although 
> the fused side has a .1 cap to ground after the fuse.
>
> The question is:  Where should I place the hot and neutral wires?
>
> 73, Barrie, W7ALW
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