[ARC5] ARC-5 and SCR-274-N IF Transformers

[Kenneth G. Gordon]

On 16 Apr 2014 at 17:30, D. Platt wrote:

> > Tapped. In what way? Center-tapped? What? Are the taps connected to
> > anything? If so, what?
>
> One or both coils have a tap near the "top" end of the coil.  The entire 
> coil is the tuned circuit but the primary tap goes to the plate and the 
> secondary goes to the next stage.

Now that is VERY interesting ! I just checked the schematics and those are 
clearly shown there. I had never noticed that before. Thanks !

In fact, they are drawn as being center-tapped.

In other words, both the plate at one end and the grid at the other are 
"tapped down" on the coils.

This would make both the plate at one end and the grid at the other end  
connected to lower-impedance points on their respective tuned circuits.

I cannot remember at the moment what this does (although I know it is very 
significant) but I SUSPECT that it broadens the IF peak.

I wonder what effect on the IF selectivity there would be if we simply moved 
both connections to the TOPS of each respective IF coil?

Now I am VERY curious.

Ken W7EKB