[ARC5] Grid Blocked Keying an ARC-5

[Kenneth G. Gordon]

On 13 Jan 2014 at 18:33, Doug Forbes wrote:

> Thanks a lot Ken, I am going to try it tomorrow.
> 
> Doug Forbes WA6VYN

Sounds good, Doug. Let us know your results.

However, one thing I left out of the previous discussion: be sure to ground 
the + (plus) sides of the full-wave bridge rectifier and the electrolytic caps, 
leaving the - (negative) sides completely UN-grounded and hard-wired 
"through", so you get a NEGATIVE 120VDC out of your supply. In such a 
supply, the negative side is the "hot" side.

Connect your resistor in the "hot" side, between the two negative leads of the 
caps.

It will look "funny" to you, since the electrolytics will look like they are "upside 
down"...but they ain't.

If you are using a tube-rectifier like a 5Y3, you ground one side of the 
filament, and use the center-tap of the transfomer as your negative voltage 
output. The filter is the same as the SS version: + (positive) sides of the caps 
grounded, - (negative) sides connected "through" with the resistor (or choke) 
between them.

If your 120 VDC is positive, you will blow up your tubes.

Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne